Code Check Building

Code Check Building

Code 3Check

®

Building

Third Edition

BY DOUGLAS HANSEN & REDwOOD KARDON

Illustrations & Layout: Paddy Morrissey

© 2011 by The Taunton Press, Inc. ISBN-13: 978-1-60085-329-6

Code Check® is a registered trademark of The Taunton Press, Inc., registered in the U.S. Patent & Trademark Office. Printed in China.

Based on Chapters 1 through 10 of the 2009 International Residential Code

®

For updates and information related to this book, visit www.codecheck.com

C

ode Check Building

is a condensed guide to the building portions of the

2009 International Residential Code (IRC) for One- & Two-Family Dwellings.

The IRC is the most widely used residential building code in the United

States. Significant code changes are highlighted in the text and summarized in the inside back cover, which means that the book is also applicable in areas using older editions of the IRC. Check with the local building department to determine which code is used in your area, and for local amendments.

These lines give the basic rule that landings at least 36 inches deep are required on each side of a door, and the code reference in the IRC is section 311.3. (In the IRC, the number is actually

R311.3. We omit the letter “R” at the beginning to save space and include more information on each line.) The line that follows is an exception to the rule, and the code reference is 311.3

Exception. This exception is a new code change, and is explained further on the inside back cover as code change #19.

Tables and Figures are referenced in the code text lines in the following way:

Example from p.17:

n

Notching & boring per F30 & T14 _______________________________ [502.8.1]

KEY TO USING THIS BOOK

T he line for each code rule starts with a checkbox and ends with an IRC code reference in brackets. Exceptions and lists start with a bullet and also end with the code reference in brackets. Changes to the 2009 code are highlighted by having the reference in a different color and an endnote to the table on the inside back cover.

Example from p.8: n

Floor or landing min 36in deep on each side of door EXC ______________[311.3]

• Balconies <60sq. ft OK for landing to be <36in deep _________ [311.3X]

19

This line says that the rules for notching & boring joists are found in section 502.8.1 and illustrated in figure 30, with further explanation in table 14.

INTRODUCTION

u

KEY

BUILDING

1

CODES

u

ABBREVIATIONS

REFERENCE DOCUMENTS

The IRC is part of the suite of codes published by the International Code Council.

It is limited to one- and two-family dwellings and townhouses not more than 3 stories above grade. It is a prescriptive document containing rules and instructions. Aspects of a building that exceed the scope of the IRC are built to the IBC, a more comprehensive document containing engineering regulations for structural design. It is acceptable to use any of the specific performance-based provisions of the International

Codes as an alternative to the prescriptive rules in the IRC.

The American Forest and Paper Association publishes the Wood Frame Con-

struction Manual for One- and Two-Family Dwellings (WFCM), which can be used as an alternate to IRC designs for wood framing.

The American Iron and Steel Institute (AISI) publishes the Standard for Cold-

Formed Steel Framing—Prescriptive Method for One- and Two-Family Dwellings

(AISI S230), which can be used as an alternative to the IRC.

The American Concrete Institute (ACI) publishes two documents that supplement the prescriptive rules of the IRC. These are ACI 318—Building Codes for Struc-

tural Concrete and ACI 530—Building Code Requirements for Masonry Structures.

The Truss Plate Institute (TPI) publishes TPI 1—National Design Standard for

Metal Plate Connected Wood Truss Construction, which is mandatory for metal-plateconnected truss design. TPI also contributes to BCSI 1-03—Guide to Good Practice

for Handling, Installing & Bracing of Metal Plate Connected Wood Trusses.

SEqUENCE OF THIS BOOK

This book follows the same basic sequence as the IRC. It begins with the administrative sections in the IRC chapter 1, followed by the planning and nonstructural topics in the IRC chapter 3. The structural sections are arranged “from the ground up,” beginning with foundations (chapter 4), followed by floors (5), wall construction (6), wall coverings (7), roof-ceiling construction (8), roof assemblies (9), and chimneys and fireplaces (10).

BUILDING

ABBREVIATIONS

AAMA = American Architectural

Manufacturers Association

ACI

= American Concrete Institute

AMI = in accordance with

manufacturer’s instructions

ASTM = American Society for Testing

& Materials

BO

= building official

BwL = braced wall line

BwP = braced wall panel

cfm

= cubic feet per minute

CMU = concrete masonry unit

EXC = exception to rule will follow

in the next line

FSD = fire separation distance

ft

= feet

GB

= gypsum board

hr

= hour

IBC

= International Building Code

ICF

= insulating concrete form

in

= inches

L&L

= listed and labeled

max = maximum

min

= minimum

mph

= miles per hour

o.c.

= on center

PL

= property line

PT

= pressure treated

psf

= pounds per square foot

psi

= pounds per square inch

req

= require

req’d = required

req’s = requires, requirements

SDC = Seismic Design Category

sq.

= square, as in sq. ft

w/

= with

w/o = without

wRB = water-resistive barrier

wSP = wood structural panel

2

EGRESS

Stairs: General 09 IRC

n

Min width above handrail 36in except spiral stairways

F11

_________[311.7.1] n

Max handrail projection into stairway 4½in

F11

__________________[311.7.1] n

Min headroom 6ft 8in EXC

F11

_______________________________[311.7.2]

• Floor openings above stair OK to project 4¾in into req’d headroom

at the side of a flight of stairs _____________________________ [311.7.2X]

20

n

Riser height max 7¾in, tread depth min 10in EXC

F12

________[311.7.4.2&3]

• Tread depth min 11in if no nosing projection on treads

F12

_____ [311.7.4.3] n

Measure rise & run exclusive of carpets, rugs, or runners ________ [311.7.4]

21

n

Tallest riser not >

3

/

8 in than shortest riser

F12

_________________ [311.7.4.1] n

Deepest tread not > 3 /

8 in than shortest

F12

___________________ [311.7.4.2] n

Max 2% slope on treads & landings ____________________________[311.7.6] n

Enclosed accessible space below stairs req’s min ½in GB _________ [302.7]

Nosings & Risers 09 IRC

n

Nosing req’d for solid risers w/treads <11in deep

F12

__________ [311.7.4.3] n

Nosing projection min ¾in, max 1¼in

F12

____________________ [311.7.4.3] n

Deepest nosing projection not >

3

/

8 in than shortest

F12

_________ [311.7.4.3] n

Beveling of nosing max ½in, max nosing radius ½in ____________ [311.7.4.3] n

Risers vertical or sloped from tread above max 30° from vertical __ [311.7.4.3] n

Open riser treads must prevent passage of 4in sphere EXC _____ [311.7.4.3]

• Opening between adjacent treads not limited if stair rise

≤30in _[311.7.4.3X]

FIG. 11

Stair width & Height

Min. 1½ in. between wall & handrail, max. 4½ in. projection from wall

Return to wall

BUILDING

Min.

36 in.

Min.

6 ft. 8 in. headroom clearance

14

Light switch req. at each floor level with 6 or more risers.

FIG. 12

Stair Rise & Run

Max. radius

9

16

in.

Tread min. 10 in.

Nosing projection: min.

>

3

3

4

in., max. 1

1

4

8

in. than smallest in.

Largest projection not

Max. 7

3

4

in.

If no nosing and solid risers, tread min. 11 in.

winding Stairs F13 09 IRC

n

Walkline concentric to curvature of stair & measured 12in from first

clear area on narrow side of winder walking surface ____________ [311.7.3]

22

n

Min tread depth 10in at walkline _____________________________ [311.7.4.2] n

Deepest tread not > 3 /

8 in than shortest measured at walkline _____ [311.7.4.2] n

OK for winder treads to not be within

3

/

8 in of depth of rectangular

treads in same flight of stairs ______________________________ [311.7.4.2]

23

FIG. 13

winding Stairs

Walkline is concentric to direction of travel & measured 12 in. from point where foot can be placed on narrow side of stairs.

Handrails 09 IRC

n

Req’d on at least one side of flights of stairs w/

≥4 risers

F11,15

___[311.7.7] n

Top 34–38in above line connecting nosings

F15

EXC __________ [311.7.7.1]

• Volute, turnout, or starting easing OK over lowest tread ______ [311.7.7.1X1]

• Fitting or bending OK to exceed max height at continuous transition

between flights, start of flight, or from handrail to guard

F15

_ [311.7.7.1X2]

24

n

Ends must return to wall or post or safety terminal

F11,15

_______ [311.7.7.2] n

Min 1½in space between wall and handrail

F11

_______________ [311.7.7.2] n

Handrail continuous from line above top & bottom nosings EXC __ [311.7.7.2]

• May be interrupted by post at landing _____________________ [311.7.7.2X1]

• Volute, turnout, or starting easing OK over lowest tread

F15

__ [311.7.7.2X2] n

Round handrails min 1¼in–max 2in diameter

F14

______________ [311.7.7.3] n

Non-round Type I handrails perimeter 4in–6¼in

F14

____________ [311.7.7.3] n

If perimeter >6¼in, finger recess req’d both sides

F14

__________ [311.7.7.3]

FIG. 14

Handrail Profiles

Min. 10 in. tread depth at walkline; deepest tread may not exceed shortest by >

3

8

in.

12 in.

Handrail

Min. 6 in. depth within shaded area

Uniform depth of rectangular treads in same flight as winders is allowed to be different than uniform depth of winders at walkline.

0 in. depth

Min. 1 at walkline

Type I Type II

EGRESS

Prohibited

BUILDING

15

FIG. 32

Prefabricated I-Joists

Hole sizes & distances to bearing points AMI

Min. 1

3

4

in. end bearing

(or AMI)

Manufactured Lumber & Floor Trusses 09 IRC

n

Cuts, notches & holes only where specified by manufacturer or

registered design professional

F32,34

________________________ [502.8.2] n

Point loads & other installation details

F34

____________________ [502.7.1X] n

Blocking, bridging & other lateral support AMI _________________ [502.7.1X] n

Truss drawings to include bracing requirements ________________ [502.11.2] n

No truss alterations w/o approval of registered design professional [502.11.3]

CRIPPLE WALLS

Cripple walls 09 IRC

n

No smaller than size of studding above cripple wall ________________ [602.9] n

If <14in high, solid WSP sheathing or solid blocking req’d __________ [602.9] n

If >4ft high, size as if additional story ____________________________ [602.9] n

SDC A, B & C bracing length 1.15× req’d length of wall above

T21

[602.10.9] n

SDC D

0

, D

1

& D

2

length 1.5x req’d length of wall above

T22

____ [602.10.9.1] n

Max spacing of bracing 18ft ________________________________ [602.10.9] n

Can be redesignated as 1st story for bracing purposes _______ [602.10.9.2]

FIG. 33

Stepped Foundation in SDC D

0

, D

1

& D

2

Min. 8-16d nails on each side of joint

Cripple walls

Min. 8 ft. full-height wall

Top of footings level

Soils

UNDERFLOOR FRAMING

u

CRIPPLE wALLS

BUILDING

31

FIG. 45

weep

Screed

2 layers paper

Wire

Weep screed

Weep screed min. 1 in.

below joint at foundation

Stucco coats:

Scratch

Brown

Finish

FIG. 46

Stucco Soffit

Casing bead of vertical surface min. ¼ in. below bead on horizontal surface so as to form a drip edge

Water-resistive membrane

Sheathing

Framing

Holes (optional) key the stucco, water exits from edge.

4 in. min. to ground

2 in. min. to pavement

ROOFING

Casing beads secured at max. 7 in. intervals

TABLE 27

SELECTED ASTM C 926 & ASTM C 1063

REqUIREMENTS

C 926 Summary of Requirement

7.1.5

Install each coat without interruption or cold joints.

8.1

Continuously hydrate between coats.

8.1

Time between coats depends on climatic & job conditions.

12.3.2

Apply when ambient temperature >40°F.

A2.2.3

Vertical-to-horizontal intersections req casing beads both surfaces, with vertical ¼ in. below horizontal to provide drip edge. Horizontal casing bead held back min. ¼ in.

F46

.

A2.3.1.2 Control joints to be included in plans & specifications.

BUILDING

45

Code 3Check

®

Plumbing

Fourth Edition

By DOUGLAS hANSEN

&

REDwOOD KARDON

Illustrations and Layout: Paddy Morrissey

© 2011 by The Taunton Press, Inc. ISBN 10 1-60085-339-0 ISBN 13 978-1-60085-339-5

Code Check

®

is a trademark of The Taunton Press, Inc., registered in the U.S. Patent & Trademark Office.

C

For more information on the building, electrical and mechanical codes, valuable resources, and why Benjamin Franklin is featured in the Code Check series, visit www.codecheck.com

ode Check Plumbing 4th Edition is an illustrated guide to common code questions in residential plumbing, heating, ventilation, and air conditioning systems. The book emphasizes the safety principles that are at the heart of the codes for these systems.

TABLE 1

Organization Edition

ICC

CODES & STANDARDS USED IN ThIS BOOK

2009

Code

International Residential Code

The primary code used in this book is the 2009 edition of the International Residential Code for One- and Two-Family Dwellings, published by the International

ICC 2009 ISPDC - International Private Sewage Disposal Code

Code Council (ICC). It is the most widely used residential code in the United

States. The other major codes referenced here are the 2009 Uniform Plumbing Code, published by the International Association of Plumbing & Mechanical

Officials (IAPMO). For most topics, these different codes are in agreement. Each of these codes also references standards, many of which are maintained by the organizations in Table 2 (

T2

).

IAPMO

IAPMO

NFPA

2009

2009

2011

Uniform Plumbing Code

Uniform Mechanical Code

NFPA 2010

NFPA 31 Standard for Installation of Oil-burning

Equipment

NFPA 211 Standard for Chimneys, Fireplaces,

Vents, and Solid Fuel-Burning Appliances

Additional codes for specialized items are listed in

T1

. The National Fire Protection Association (NFPA) publishes several of these. They also maintain NFPA 54

– The National Fuel Gas Code, which forms the basis of the fuel gas provisions in the IRC, UPC, and UMC.

NFPA 2009 NFPA 54 National Fuel Gas Code

NFPA 2011 NFPA 58 Liquified Petroleum Gas Code

The 2009 cycle of codes is likely to remain in effect in most areas for at least 3 or

4 years after the cover date. Energy codes vary greatly from one area to another, and may modify or overrule the code requirements shown in this book. Before beginning any project, check with your local building department to determine the codes that apply in your area.

Thanks to Hamid Naderi of ICC for his editorial input.

INTRO

u

CODES & STANDARDS

PLUMBING

65

GENERAL RULES FOR ALL PIPING

Materials 09 IRC 09 UPC

n

Materials must be 3rd party tested or certified_________ [2608.4] {301.1.1} n

All pipes & fittings marked by manufacturer ___________ [2608.1] {301.1.2}

Pipe Support

n

Hangers must prevent distortion & maintain alignment

09 IRC 09 UPC

(no wires, no metal straps contacting plastic pipe)

F1

__ [2605.1] {314.2&4} n

Insulate Zi hangers from contact w/ Cu pipes _________ [2605.1] {314.4} n

Max support intervals for water pipe

T3

,

4

_____________ [2605.1] {314.1}

TABLE 3 IRC MAX. SUPPORT SPACING OF wATER PIPE [T2605.1]

Pipe Material

ABS/PVC DWV

Threaded steel

Cast-iron hubless

Cu water tubing

CPVC

Horizontal

4 ft.

12 ft.

5 ft. (10 ft. OK for 10 ft. lengths of pipe)

PEX

PEX-AL-PEX

A. Provide mid-story guides for pipes 2 in.

6 ft. for 1¼ in. pipe

10 ft. for 1½ in. pipe

3 ft. for 1 in. pipe

4 ft. for 1¼ in. pipe

32 in.

32 in.

Vertical

10 ft.

A

15 ft.

15 ft.

10 ft.

10 ft.

A

10 ft.

A

4 ft.

A

FIG. 1

Plastic

Pipe

Support &

Spacing

Listed plastic hangers

4ft. max. spacing between supports

Improper supports

Wire & plumber’s tape not allowed in direct contact with pipe

TABLE 4 UPC MAX. SUPPORT SPACING OF wATER PIPE [T3-2]

Pipe Material

ABS/PVC DWV

Threaded steel

Cast-iron hubless

Horizontal

4 ft.

per AHJ

Within 18 in. of joints

B

(every other joint if 4 ft.)

Vertical

Base & each floor per AHJ

A

Base & each floor 15 ft.

Cu water tubing

CPVC

6 ft. for 1½ in. pipe

10 ft. for 2 in. pipe

3 ft. for 1 in. pipe

4 ft. for 1¼ in. pipe

32 in.

Each floor 10 ft.

Base & each floor

A

PEX

PEX-AL-PEX 98 in.

C

Base & each floor

Base & each floor

A. Provide mid-story guides.

B. Includes horizontal branch connections. Hangers are not OK directly on couplings.

C. Some manufacturers require closer support spacing.

A

A

GENERAL RULES FOR ALL PIPING

PLUMBING

69

CLEANOUTS

IRC Cleanout (CO) Requirements (cont.) 09 IRC

n

Req’d for runs with aggregate change of direction >135°

F14

________ {707.4} n

Trap arm bends <90° do not req CO ____________________________{707.14} n

Takeoff above flow line unless wye branch or end of line

F30

_________ {707.5} n

Pipes 2in req 12in clearance; >2in req’s 18in clearance ____________{707.10} n

Underfloor CO must extend above finished floor or outside building if >20ft from access door or if <18in vertical clearance or if passageway to CO <30in wide _________________________________ {707.9}

FIG. 13

UPC Cleanouts horizontal

Distances

WC

LAV

KS

PLUMBING

FIG. 14

Cleanout Bends & Clearances

CO req’d.

CO

45

UPC

req’s. a CO for an aggregate total bend >135˚.

45

(plan view)

1

8

bends

IRC

45

CO

45 + 45 + 45 + 45 = 180

CO req’d.

req’s a CO for every change of direction > 45° except only one is req’d each 40 ft.

76

FIG. 15

Adding Drain at Cleanout

CO

<5ft.

COs may not be used for new fixtures.

5ft.

2-way CO if no upper terminal

CO

If additional drain is added here, new CO is req’d.

FIG. 25

Directional

Fittings

TRAPS & TAILPIECES

u

VENTS

Cap

Baffle

Washer

No fittings w/o baffles

End outlet tee

Center outlet tee

FIG. 26

Trap Adapter for Tubing Traps

Arm extends too far into pipe.

Trap adapter with internal stop

Threaded nut

Washer

PLUMBING

FIG. 27

Crown Venting

Too close, must be at least 2 pipe diameters

82

Improper application of sanitary tee; cannot be placed on back

VENTS

V

ents prevent atmospheric pressure differences across traps and are essential to maintaining the trap seal. Without vents the water in the seal could be sucked out, leaving the occupants unprotected from contaminants downstream of the trap. The

IRC and UPC have very different approaches to venting.

General 09 IRC 09 UPC

n

All fixture traps req venting ______________________ [3101.2.1] {901.0} n

Vent system not to be used for any other purposes ____ [3101.3] {n/a} n

No flat dry vents (take off above horizontal centerline)

F30

[3104.3] {905.2} n

Slope vents to drain to soil or waste piping __________ [3104.2] {905.1} n

Change direction with appropriate fittings

F29

________ [3104.2] {903.3} n

No vent opening below trap weir except toilets

F24

____ [3105.2] {905.5} n

No crown vents: min 2 pipe diameters from trap

F27

___ [3105.3] {1002.2} n

Horizontal dry vents min 6in above FLR

F28

__________ [3104.4] {905.3} n

Horizontal branch vents min 6in above FLR

F28

_______ [3104.5] {905.3} n

Piping <6in above flood rim req’s drainage type fittings [3104.2] {905.3}

FIG. 65

Toilet Flanges

Closet flange should be flush or above finished floor AMI

Beneath floor: concealed fouling areas

FIG. 66

Fixture

Layout

WC

Flange

15 in.

Spacer

Toilets & Bidets 09 IRC 09 UPC

n

Floor flanges req’d for floor outlets

F65

______________ [2705.1] {408.3} n

Secure floor flange with corrosion-resistant fasteners __ [2705.1] {408.3} n

WC or bidet req’s min 15in clearance from center to side walls or outer rim of adjacent fixtures or partitions or vanity

F66

__ [2705.1]

21

{407.5} n

Min 21in (24in UPC) front clearance

F66

____________ [2705.1] {407.5} n

No offset or reducing floor flanges ________________ [3002.3.1] {408.3} n

Max distance from closet ring to vent 6ft UPC

(unlimited IRC) _________________________________[3105.1X] {T10-1} n

Ballcock critical level 1in above overflow pipe _________ [2712.4] {603.4.2}

Tubs 09 IRC 09 UPC

n

Slip joints accessible, min 12in × 12in door

F23

______ [2704.1] {404.2} n

Over-rim bath spout–min air gap 2in from flood rim _ [T2902.3.1] {T6-3} n

Overflow min 1½ in diameter _______________________ [2713.1] {404.3} n

Tub or whirlpool max water temp 120ºF ______________ [2713.3] {414.5}

21 in.—

IRC

24 in.—

UPC

FIG. 67

Shower Pan

Outside dimensions:

IAPMO listed—39

1

/

2

in.

NOT IAPMO listed—37

1

/

2

in.

15 in.

21 in.—

IRC

n/a—

UPC

Distance to opposite wall or fixture

Min. 22 in.

FIXTURES BATHROOMS

PLUMBING

107

Tubs IRC UPC

n

Slip joints accessible w/ min 12×12in door

F25

_____ [2704.1] {404.2} n

Over-rim bath spout min air gap 2in from flood rim [T2902.3.1] {T6-3} n

Overflow [req’d] min 1 1 /

2 in dia

F25

________________ [2713.1] {404.3} n

Tub or whirlpool max water temp 120°F __________ [2713.3]

41

{414.5}

41

FIG. 79

Shower Pan

Outside dimensions: n

Whirlpool tub access must allow pump removal [min 12×12in],

18in by18in if pump >2ft from access opening _____ [2721.2]

42

{n/a}

IAPMO: Listed - 39 1 /

2

in.

Showers

1 /

2

in.

n

Min area 900sq.in {1024sq.in} min dia 30in measured from

finished wall to center of threshold

F80

_____________ [2708.1] {411.7} n

Min shower area to be maintained to 70in above drain [2708.1] {411.7} n

Showerheads, valves, grab bars, & soap dishes: allowed to

protrude into req’d min space _____________________ [2708.1] {411.7} n

Shower walls watertight to min 72in above drain ______ [307.2] {IS-4 n

Finished threshold height min 1in below receptor & 2–9in

above top of drain

F80

__________________________ [2709.1] {411.6} n

Door must open outward

F79

____________________ [2708.1]

43

{411.6} n

Door min 22in wide

F79

______________________ [2708.1.1]

44

{411.6} n

Finished floor slope 1 /

4

– 1 /

2 in/ft ____________________ [2709.1] {411.6} n

Secure shower valve, head/riser to permanent structure [2708.2] {411.11} n

Shower head not discharging directly at door________ [2705.1] {411.10} n

Listed anti-scald/pressure-balance valve

req’d 120°F max ________________________________ [2708.3] {418.0}

Min. 22 in. U

PC

FIXTURES

u

BATHROMS

PLUMBING

113

Code 3Check

®

Mechanical

Fourth Edition

By DOuglAS HANSEN

&

REDwOOD KARDON

Illustrations and layout: Paddy Morrissey

© 2011 by The Taunton Press, Inc. ISBN 10 1-60085-339-0 ISBN 13 978-1-60085-339-5

Code Check

®

is a trademark of The Taunton Press, Inc., registered in the U.S. Patent & Trademark Office.

C

For more information on the building, electrical and mechanical codes, valuable resources, and why Benjamin Franklin is featured in the Code Check series, visit www.codecheck.com

ode Check Mechanical 4th Edition is an illustrated guide to common code questions in residential plumbing, heating, ventilation, and air conditioning systems. The book emphasizes the safety principles that are at the heart of the codes for these systems.

TABlE 1 CODES & STANDARDS uSED IN THIS BOOK

Organization Edition Code

ASHRAE 2010

ASHRAE 62.2 Ventilation and Acceptable Indoor

Air Quality in Low-Rise Residential Buildings

The primary code used in this book is the 2009 edition of the International Resi-

dential Code for One- and Two-Family Dwellings, published by the International

Code Council (ICC). It is the most widely used residential code in the United

States. The other major codes referenced here are the 2009 Uniform Mechani-

ICC 2009 International Residential Code

ICC 2009 ISPDC - International Private Sewage Disposal Code

cal Code, published by the International Association of Plumbing & Mechanical

Officials (IAPMO). For most topics, these different codes are in agreement. Each of these codes also references standards, many of which are maintained by the

IAPMO 2009 Uniform Plumbing Code

IAPMO 2009 Uniform Mechanical Code organizations in Table 2 (

T2

).

NFPA 2011

NFPA 31 Standard for Installation of Oil-burning

Equipment

Additional codes for specialized items are listed in

T1

. The National Fire Protection Association (NFPA) publishes several of these. They also maintain NFPA 54

– The National Fuel Gas Code, which forms the basis of the fuel gas provisions in the IRC, UPC, and UMC.

NFPA 2010

NFPA 211 Standard for Chimneys, Fireplaces,

Vents, and Solid Fuel-Burning Appliances

NFPA 2009 NFPA 54 National Fuel Gas Code

The 2009 cycle of codes is likely to remain in effect in most areas for at least 3 or

4 years after the cover date. Energy codes vary greatly from one area to another, and may modify or overrule the code requirements shown in this book. Before beginning any project, check with your local building department to determine the codes that apply in your area.

NFPA

NFPA

2011

2011

NFPA 58 Liquified Petroleum Gas Code

NFPA 70 National Electrical Code

Thanks to Hamid Naderi of ICC for his editorial input.

HVAC

INTRO

u

CODES & STANDARDS

123

HVAC

FORCED AIR FURNACES general Rules & Clearances 09 IRC 09 uMC

n

Prohibited in bedroom, bathroom or their closets EXC __ [2406.2] {904.1}

• Direct-vent type installed AMI _____________________ [2406.2] {904.1}

• Separated by weather-stripped self-closing door & all

combustion air from exterior ______________________ [2406.2] {904.1} n

Equipment room door large enough to remove appliance

[min 24 wide in IRC] ____________________________ [1305.1.2] {304.0} n

Work space min 30in deep & wide in front of appliance _ [1305.1] {304.0} n

FAUs in alcoves or closets must be L&L for alcove ___ [2409.3.2] {904.2B} n

FAUs clearance AMI EXC ______________ [2409.3.2, 2409.4.2]

• Clearance reduction OK if room large in comparison

{904.2} w/size of equipment ___________________ [2409.3.3, 2409.4.3] {904.2A&B} n

Install above design flood elevation __________________ [1401.5] {307.2} n

Air filter req’d AMI ________________________________ [2442.1] {311.2}

Electrical Requirements 09 IRC 11 NEC

n

Receptacle within 25ft of appliance __ [1305.1.3.1 & 1305.1.4.3] {210.63} n

Crawlspace furnace req’s light w/switch at access__[1305.1.4.3] {210.70A3} n

Attic furnace req’s light w/switch at access ________[1305.1.3.1] {210.70A3} n

Individual circuit req’d for central heating _____________ [3703.1] {422.12} n

No other equipment on central heating circuit EXC ____ [3703.1] {422.12}

• Associated pumps, humidifiers, air cleaners, & AC ____ [3703.1] {422.12X}

underfloor 09 IRC 09 uMC

n

Equipment support on grade req’s min 3in pad _______ [2408.4]

5

{904.3.1.1}

5

n

Suspended equipment min 6in above grade __________ [2408.4] {904.3.1.2}

6

n

Passageway min 22in wide×30in high ____________ [1305.1.4] {904.11.1} n

Passageway max distance 20ft to equipment EXC ___ [1305.1.4] {904.11.2}

• Unlimited length if passageway 6ft high & 22in wide [1305.1.4X2] {904.11.2}

FORCED AIR FuRNACES

136

Attic 09 IRC 09 uMC

n

Opening min 20in wide {22in UMC} & >appliance size [1305.1.3] {904.11.1} n

Passageway min 22in wide×30in high _____________ [1305.1.3] {904.11.1} n

Max distance from opening 20ft EXC ______________ [1305.1.3] {904.11.2}

• [50 if ≥6ft high in IRC] {Unlimited if ≥6ft in UMC} _ [1305.1.3X] {904.11.2} n

Solid floor min. 24in wide to equipment ____________ [1305.1.3] {904.11.3} n

Min 30×30in platform in front of firebox EXC

F17

___ [1305.1.3] {904.11.4}

• Not req’d if equipment can be serviced from opening [1305.1.3X1] {Ø}

1

FIg. 17

No added loads on trusses except per design.

Min. 30 in. platform on control side

Light switch

Attic Furnace

Platform noncombustible or AMI

Min. 5 ft. from flue collar to termination

HVAC

BOILERS & HYDRONICS

Modern high-efficiency boilers are often used with indirect water heaters as well as

for hydronic heating systems. Heat can be distributed through radiators, baseboard convectors, radiant slab-encased tubing, or through duct heaters.

Steam & Hot-water Boilers 09 IRC 09 uMC

n

Install AMI ______________________________________ [2001.1] {303.1} n

Installer to supply control diagram & operating manual __ [2001.1] {1020.0} n

Hot water boilers req pressure & temperature gauges

F20

[2002.2] {1004.3} n

Steam boilers req sight-glass & pressure gauge _______ [2002.3] {1004.3} n

Pressure regulator req’d on water feed

F20

_____________[manu] {manu} n

Shutoff valves req’d in supply & return piping EXC

F20

_ [2001.3] {1011.0}

• Single low-pressure steam boiler _________________[2001.3X] {1011.0} n

Low-water cutoff control req’d ______________________ [2002.5] {1011.0} n

Hydronic boilers req expansion tanks

F19

____________ [2003.1] {1005.1} n

Tank support designed for twice waterlogged weight ___ [2003.1] {1005.1} n

Tank capacity based on system volume

T4

____________ [2003.2] {1005.4} n

PRV req’d

F20

___________________________________ [2002.4] {1011.0} n

PRV drain piped to within 18in of floor or receptor _____ [2002.4] {1006.0}

FIg. 19

Expansion Tank

Expanded water

Diaphragm

As water temperature increases & pressure rises, expanded water pushes against the diaphragm & compresses the air, preventing excessive pressure in the piping.

The tank must be sized

per T4 for the total

volume in the system, including the water in the boiler. The tank support must be designed for twice the waterlogged weight of the tank.

BOIlERS & HYDRONICS

138

FIg. 20

Boiler & Indirect water Heater

Water from tank can reach scalding temperatures & must be tempered by a thermostatic mixing valve

Indirect water heater

TPRV

In addition to the expansion tank

F19

, every boiler must have a shutoff valve, pressure reducing regulator, temperature & pressure gauge, pumps, check valves, & depending on the boiler, an air scoop or bleed valves

Boilers can serve as a heating system & can provide & provide the energy source for an indirect-fired water heater. A single highefficiency boiler can be the energy plant for the

Combustion air in

whole house.

Boiler

Flue gases out

Gas line

PRV

Return water

Electrical

Return water

Heated water from boiler or solar

Heated water

Condensation is produced in the boiler & exhaust & must be discharged AMI.

Vent Size using Manufacturer’s Tables 09 IRC 09 uMC

n

Tables can be used for all Category I appliances ____ [2427.6.8.1] {802.6.3.1} n

Req’d to be used if appliance is induced draft _____ [2427.10.3.1] {802.10.3.1} n

Connector not >2 sizes larger than flue collar ______ [2428.2.11] {803.1.10} n

When vertical vent > than connector, use vertical diameter to determine table min & connector diameter for table max _____________________________________ [2428.2.8] {803.1.7} n

Use double-wall vent tables only for vents not exposed to outdoors below the roof line (B vent in unvented chase insulated to R-8 or in unused masonry chimney flue not considered outdoors) ___________________________ [2428.2.9] {803.1.8.1} n

Zero lateral values only if straight vertical vent connects directly to top outlet draft hood or flue collar __________________________ [2428.2.4] {803.1.3} n

No elbows if using “zero lateral length” part of table __ [2428.2.3] {803.1.2} n

Vent tables w/ lateral length allow for 2-90° elbows __ [2428.2.3] {803.1.2} n

Reduce table capacity 5% each elbow up to 45° & 10% each elbow >45° up to 90° ______________________ [2428.2.3] {803.1.2} n

Reductions for elbows in common vents as above ___ [2428.3.6] {803.2.6} n

Reductions for common vent connectors as above ___ [2428.3.7] {803.2.7}

Multiple Appliances Vented in Common 09 IRC 09 uMC

n

Tables req’d to be used if induced draft included _ [2427.10.3.1] {802.10.3.1} n

Join multiple connectors as high as possible per available headroom & clearance

F28

____________________[2427.10.3.4] {802.10.3.4} n

Connect smaller above larger EXC

F28

___________ [2427.10.4] {802.10.4.1}

• OK if both at same level if max 45° from vertical _ [2427.10.4.1] {802.10.4.1} n

If both appliances have draft hoods, OK to size vent for

100% of larger + 50% of smaller ______________ [2427.10.3.4] {802.10.3.4} n

Reduce connector table capacity 5% each elbow up to 45° & 10% each elbow >45° up to 90°

F28

______[2428.3.7] {803.2.7}

HVAC

FIg. 28

Smaller appliance connector as high as possible per available headroom before offsetting horizontally

Venting in

Common

Smaller appliance connector enters vent above larger connector.

Openings into vent at same level min. 45˚ from horizontal

≥ 45˚

Forced Vents (Category IV) 09 IRC 09 uMC

n

All mechanical draft systems L&L & installed AMI _____[2427.3.3] {802.3.4.1} n

Forced draft system must be gas tight ______________[2427.3.3] {802.3.4.3} n

No natural & forced-vent to common flue ____________[2427.3.3] {802.3.4.4} n

Terminate min 7ft above ground where adjacent to public walkways ______________________________________[2427.3.3] {802.3.4.6} n

Terminate 3ft above forced air inlets within 10ft________ [2427.8] {802.8.1} n

Terminate min 4ft to side or below or 1ft above building openings, min 1 ft above ground level EXC __________ [2427.8] {802.8.2}

• Termination can be same as direct vent (p.35) if AMI __ [2427.8] {802.8.1&2} n

Collect & dispose of condensate from vent (see p.29) __ [2427.9] {802.9}

gAS APPlIANCE VENTINg

145

HVAC

Connection to Masonry Fireplace (Stoves & Fireplace Inserts) NFPA 211

n

Connector must extend to flue liner—not just to firebox _____________[12.4.5.1] n

If connector enters direct through chimney wall above smoke chamber, noncombustible seal req’d below entry _________________________[12.4.5.1] n

No dilution of combustion products in flue w/ habitable space air ___[12.4.5.1] n

Flue not less than size of appliance collar _______________________[12.4.5.1] n

Flue diameter max 2× appliance collar if chimney walls exposed to exterior below roof___________________________________________[12.4.5.1] n

Flue diameter max 3× appliance collar if no part of chimney walls exposed to exterior below roof _________________________________[12.4.5.1] n

Installation must allow for chimney inspection & cleaning ___________[12.4.5.1]

CLEARANCE REDUCTION SYSTEMS

C

learance reduction systems are used with solid-fuel, oil-burning, and gas-burning appliances. They provide a practical means of installing appliances in spaces where they otherwise might not fit or would take too much space in a room. They may not be used with appliances in closets (alcoves); those appliances require clearances in accordance with the nameplate label. Tables 9.5.1.2 & 12.6.2.1 in NFPA 211have the same values as

T9

for fireplace stoves, which otherwise require 36 inches clearance. The UMC uses

T9

as table 5.3, and in NFPA 54 it is table 10.2.3(b).

Clearance Reduction Systems 09 IRC

n

Clearance reductions allowed per

T9

___________ [1306.2, 1803.3.4, 2409.2] n

Gas appliance & vent connector reductions per

F39

,

T9

___________ [2409.2] n

Solid fuel appliances not allowed to be reduced to <12in EXC ____[1306.2.1]

• Appliances listed for <12in & installed AMI ___________________[1306.2.1] n

No spacers directly behind appliance or connector

F37

,

38

________ [F1306.2] n

Spaces noncombustible (stacked washers, conduit,etc.) __________ [F1306.2] n

Ventilated air space min 1in & open at edges

F37

,

38

,

T9

__________ [1306.2] n

Air space in corner open top & bottom

F38

,

T9

__________________ [1306.2] n

Air space on flat wall open top & bottom or side & top

F37

,

T9

______ [1306.2]

FREESTANDINg STOVES

u

ClEARANCE REDuCTION

SYSTEMS

FIg. 38

Clearance-Reduction

System for Fireplace

Stove

The spacers that hold out the clearance-reduction system from the wall must not be located directly behind the appliance or connector.

The appliance’s distance from the wall must be in accordance w/T9.

156

FIg. 39

Clearance Reduction for gas Equipment or gas Vent Connectors

Combustible wall construction

Clearance reduction system

Allowable reduction per

T9

Required clearance without protection

Distance of each dashed arrow must equal the required clearance without protection distance

Gas equipment or vent connector

KITCHENS

Freestanding Ranges 09 IRC 09 uMC

n

Must be listed as household type – not commercial ____ [2447.3] {n/a} n

Vertical clearance to combustibles min 30in EXC _______1901.1] {916.1B}

• Lesser clearances AMI ___________________________ [1901.1] {916.1B}

• 24in OK w/ metal hood or metal over millboard __________[n/a] {916.1B} n

Side clearance to combustibles AMI EXC ____________ [1901.2] {916.1A}

• 6in min sides & rear for unlisted appliances _______________[Ø] {916.1A}

Built-in Ranges 09 IRC 09 uMC

n

Install AMI ______________________________[1901.2 & 2447.1] {916.2A&C} n

Vertical clearance to combustibles min 30in EXC

F45

___1901.1] {916.2B}

• Lesser clearances AMI

F45

_______________________ [1901.1] {916.2B}

• 24in OK w/ metal hood or metal over millboard __________[n/a] {916.2B} n

Must be level ________________________________________[n/a] {916.2D}

Hood for Open-top Broilers 09 IRC 09 uMC

n

Hood req’d & must extend as wide as broiler unit ______ [1505.1] {920.3} n

Min ¼in clearance to combustibles _________________ [1505.1] {920.3} n

Min 24in from cooking surface to combustible materials [1505.1] {920.3} n

Must be ducted to outdoors & have backdraft damper __ [1505.1] {504.1}

Range Hoods 09 IRC 09 uMC

n

Must go outdoors (min 3ft from openings UMC) EXC __ [1503.1] {504.5}

• Ductless (recirculating) range hoods OK ___________[1503.1X] {303.1} n

Exterior openings screened w/ ¼in to ½in mesh ______ [1503.1] {n/a} n

Min 100 cfm intermittent or 25 cfm continuous ________ [1503.3] {n/a} n

PVC OK for downdraft duct under slab _____________ 1503.2X] {504.2X}

HVAC

FIg. 45

Range

Clearances

Lesser clearances allowed for listed appliances per terms of listing.

30 in. to unprotected surface

Clearance to range hood AMI

INSPECTIONS general 09 IRC 09 uPC

n

Nothing concealed until inspected and approved ______ [2503.2] {103.5.1} n

Testing to be conducted in presence of AHJ __________ [2503.1] {105.5.3.1}

water Supply 09 IRC 09 uPC

n

Test all piping before cover or concealment ___________ [2503.2] {103.5.1.1} n

Water pipe test under working pressure 15 minutes EXC [2503.7] {609.4}

• 50 PSI air for other than plastic pipe ________________[2503.7 {609.4} n

Water for testing must be from potable water source ___ [2503.7] {609.4} n

RPPBP devices tested at installation & annually _____ [2503.8.2] {603.3.3} n

Test gauges req’d to have increments of: _____________ [2503.8] {319.1-3}

• 0.1 psi up to 10 psi test pressure

• 1 psi up to 100 psi test pressure

• 2 psi up if over 100 psi test pressure

KITCHENS

u

INSPECTIONS

161

Code 3Check

®

Electrical

6th Edition

Based on the 2011 NEC

®

and the 2009 IRC

®

By REDWOOD KARDOn & DOUGLAS HAnSEn

Illustrations & Layout: Paddy Morrissey

© 2010 by The Taunton Press, Inc. ISBN 978-1-60085-012-7

Code Check® is a registered trademark of The Taunton Press, Inc., registered in the U.S. Patent & Trademark Office.

C

ode Check Electrical is a field guide to common code issues in residential

electrical installations. It is based on the 2011 national Electrical Code

—the most widely used electrical code in the United States—and the 2009

International Residential Code. Before beginning any electrical project, check

with your local building department. In addition to a model code, energy codes and special rules from utility companies could also apply.

HOW TO USE CODE CHECK ELECTRICAL

Each text line ends with two code citations. The code numbers on the left, with straight brackets, refer to the 2009 IRC. The code numbers on the right, in braces, refer to the 2011 NEC. For example (from p. 4): n

Max 6 disconnects to shut off power _________________ [3601.7] {230.71}

This line states that there can be no more than 6 disconnects to shut off power, and the rule is found in 3601.7 of the IRC and 230.71 of the NEC.

Each code line in Code Check Electrical references the two codes named above.

Many building jurisdictions use older versions of the codes. If you are in an area that still uses the 2008 NEC, look in the “09 IRC” column of code references to see if the item applies in your area, and use the table on the inside back cover to see changes that were made in the 2008 nEC, 2009 IRC, and 2011 nEC.

In places where the IRC does not reference a particular rule, the NEC rule might still apply, even where the IRC code is adopted. The IRC states that items not specifically mentioned in that code should comply with the NEC. This applies to issues such as old wiring, outside feeders, and photovoltaics, which are not covered in the IRC.

For information on electrical fundamentals and theory, visit:

http://www.codecheck.com/cc/OhmsLaw.html

An “n/a” in a code line means the rule is not applicable to that particular code.

An “EXC” at the end of a line means that an exception—or exceptions—to the rule will follow in the next line, for example (from p. 12): n

Backfed breakers secured in place EXC ______________ [3706.5] {408.36D}

• Output circuits from utility interactive PV inverter _________[n/a] {705.12D6}

Backfed breakers must be secured in place per IRC 3606.5 & NEC 408.36, except that the NEC has an exception for photovoltaic circuits from an inverter. The

“n/a” in the IRC column tells us this rule does not apply to that code. The list of abbreviations (to the right on this page) tells us that PV = photovoltaic.

HOW TO USE CODE CHECK ELECTRICAL

u

EXAMPLES

ELECTRICAL

183

FIG. 2

Overhead Conductor Clearances

Overhead Feeder

8 ft.

.

A

10 ft.

.

C

18 ft. or per utility

.

B

3 ft.

.

D

18 in.

.

E

Service Drop

3 ft.

.

F

3 ft.

.

G

10 ft.

.

H

1 ft.

.

I

12 ft.

.

J

Communications wire

ovErHEAD sErvICE Drop CLEArANCEs

S

ervice drop conductors typically have no outer jacket for physical protection and no overload protection at their source. They are protected by isolation and proper clearances. The codes specify minimum clearances, and the serving utility may have different rules that override the code. Check with your local jurisdiction to determine any variations from the standard clearances below.

vertical above Roof F2 09 IRC 11 nEC

n

<4-in-12 slope: min 8ft

.

A

EXC ________________ [3604.2.1] {230.24A}

• 3ft OK if roof area guarded or isolated _______________[n/a] {230.24AX5}

1

n

4-in-12 slope: min 3ft

.

G

EXC ______________ [3604.2.1X2] {230.24AX2}

• 18in OK for ≤4ft over eave

.

E

______________ [3604.2.1X3] {230.24AX3} n

Maintain req’d distance above roof for 3ft past

edge EXC __________________________________ [3604.2.1] {230.24A}

• Edge clearance above roof is not req’d when

attached to side of building __________________ [3604.2.1X4] {230.24AX4}

ELECTRICAL

vertical above Grade F2 09 IRC 11 nEC

n

10ft above final grade to lowest point of drip loop _ [3604.2.2] {230.24B1} n

Area accessible only to pedestrians: 10ft

.

H

_____ [3604.2.2] {230.24B1} n

General above grade & driveways: 12ft

.

J

_______ [3604.2.2] {230.24B2} n

Above roads or parking areas subject

to truck traffic: 18ft

.

B

_______________________ [3604.2.2] {230.24B4} n

Any direction from swimming pool water: 22 1 /

2 ft ____ [4103.5] {680.8A}

Openings & Communication Wires F2 09 IRC 11 nEC

n

Vertical above decks & balconies: 10ft

.

C

_____________[n/a] {230.9B} n

From side of area above decks & balconies: 3ft

.

D

__ [3604.1] {230.9A} n

Below or to sides of openable window: 3ft

.

F

______ [3604.1] {230.9A} n

Communications wire

≥12in to parallel power wires

.

I

___[n/a] {800.44A4}

The clearances from windows and doors apply to open conductors and not to conductors contained inside a raceway or a cable with an overall outer jacket. The codes do not have a requirement for minimum clearance of open conductors above a window. Check to see if your local utility has a requirement.

OvERHEAD SERvICE DROP CLEARAnCES

189

ELECTRICAL

FIG. 15

Service

Panel

Bonding bushing

F12

req’d for service conductors entering through concentric knockouts.

GEC

Breaker protects panel & subpanel

ELECTRICAL

PAnELBOARDS & CABInETS

FIG. 16

Subpanel

LINE sIDE

LoAD sIDE

Neutral conductor identified

(white tape encircling end of conductor)

Bond neutral in service enclosure

4-conductor feeder

All multiwire circuits req. handle ties or single-handle

2-pole breaker.

EGC

No wire tie needed for multiwire circuit in cable.

Do not bond neutral in subpanel.

Neutrals of multiwire circuits grouped by wire ties to associated circuit conductors

204

ELECTRICAL

GROUnD-FAULT CIRCUIT InTERRUPTERS

A GFCI also detects improper connections of the neutral (grounded conductor) to ground. A second “injector” coil F24 surrounds the monitored circuit and induces a small current. Should the neutral have a downstream connection to ground, current will escape outside the circuit, and the sensor coil circuit will be activated as described above.

FIG. 24

neutral to

Ground Fault

FIG. 25

Adding

GFCI in Old

Houses

Flexible tubing

Backer plate

Box extension

GFCI receptacle

210

Induced current flows out of monitored loop.

Injector coil

Ground fault

Steel box

Older shallow-back boxes might need an extension to accommodate a GFCI

A GFCI receptacle can provide protection for other receptacles downstream on the circuit. GFCI protection can be provided by GFCI breakers or GFCI receptacles F26.

GFCIs take more space inside a box than a conventional receptacle. When adding GFCIs to old houses with shallow boxes, it might be necessary to first add an extension box, as in F25.

FIG. 26

GFCIs

A GFCI will operate properly without an equipment ground. The receptacle should be labeled “no equipment ground” & any downstream protected receptacles should also have that label as well as a label stating that they are GFCI protected. Labels are not required for properly grounded GFCI-protected receptacles.

ELECTRICAL

ELECTRICAL

FIG. 30

Kitchen Receptacles

Cord-plug connected rangehood allowed if supplied by individual branch circuit

Max. 12 in. below countertop surface

Max. 6 in. overhang above receptacle

Island or peninsula countertop spaces req. only 1 receptacle—2 ft./4ft. rule does not apply.

ELECTRICAL

4 ft. max.

2 ft. max.

4 ft. max.

Receptacle on end not r this dimension <6 ft.

”.

eq’d if

Bar-type counter acts as room divider, so receptacle req. within 6 ft. of end

KITCHEnS

FIG. 31

2 ft./4 ft. Rule

2 ft.

4 ft. max.

2 ft.

Wall countertop receptacles serve the spaces for

2 ft. on each side of the receptacle. Therefore, the maximum spacing between receptacles on the same countertop space is 4 ft.

This receptacle does not serve the countertop or need

GFCI protection

216

nM — nonmetallic Sheathed Cable (nM) F48 09 IRC 11 nEC

n

OK in dry locations only _________________________ [3801.4] {334.12B4} n

Protect exposed cable from damage where necessary [3802.3.2] {334.15B} n

Listed grommets for holes through metal framing ____ [3802.1] {300.4B1} n

OCPD selection based on 60° column

T11

_______[3705.4.4] {334.80} n

Derating & temp correction based on 90° rating _____ [3705.4.4] {334.80} n

Derate >2 NM cables in same caulked

(fireblocked) hole _____________________________[3705.4.4] {334.80} n

Derate >2 NM cables installed w/o spacing in contact

w/ thermal insulation ________________________ [3705.4.4]

40

{334.80} n

Secure to box w/ approved NM clamp EXC

F49

__ [3905.3.2] {314.17B&C}

• Single gang (2 1 ⁄

4

×4in) plastic box stapled

within 8in ___________________________________ [3905.3.2] {314.17CX} n

Min

1

4 in sheathing into plastic boxes ___________ [3905.3.1] {314.17C} n

Secure within 12in of box & max 4 1 ⁄

2 ft intervals _____ [3802.1] {334.30} n

Do not overdrive staples or staple flat cable on edge [3802.1] {334.30} n

Bends gradual (min 5× cable diameter) ___________ [3802.5] {334.24} n

Running board for small cable under joists

F47

_____ [3802.4] {334.15C}

FIG. 48

nM — nonmetallic-

Sheathed Cable

FIG. 49

Metal

nM Clamps

Plastic

AC — Armored Cable (BX

TM

) F50 09 IRC 11 nEC

n

Dry locations only ______________________________ [3801.4] {320.10} n

Secure within 12in of box & max 4 1 ⁄

2 ft intervals EXC [3802.1] {320.30B}

2ft where flexibility needed (motors)_______________ [3802.1] {320.30D} n

Insulated (anti-short) bushing at terminations

F50

___ [3802.1] {320.40} n

Armor is EGC—don’t bring bond wire into box

F50

__ [3908.8] {250.118} n

Underside of joists—secure at each joist _______________[n/a] {320.15}

FIG. 50

Approved BX connector

Bonding wire

Antishort bushing

“redhead”

AC (BX

TM

Cable

) —

Armored

Inspection window

Bonding wire is not grounding wire; don’t bring into box.

Paper filler

ELECTRICAL

CABLE SySTEMS

227

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