PV Labeling Requirements – NEC 2014

Solar Energy Solutions
PV Labeling Requirements – NEC 2014
A.
SOLAR PANEL — Solar photovoltaic panels convert energy from the sun into DC power.
B.
COMBINER BOX — Power cables run DC power from multiple solar panels into the
combiner box which unites all the power cables into one. Typically, a combiner box
consolidates multiple power sources into one single power source that is fed to a DC
breaker or recombiner box.
C.
DC BREAKER or DC DISCONNECT — The DC breaker is designed to shut off
the DC power coming from the solar array. Shutting off the DC breaker does
not stop power from feeding into the DC breaker, but keeps the power from
going past the DC breaker. This is why EMT or conduit must be marked with
the words PHOTOVOLTAIC POWER SOURCE to alert emergency personnel
to the presence of a live solar circuit.
Must be reflective per
NEC 630.31 &
IFC 605.11.1.2
D.
CONDUIT — The conduit routes and protects the solar power cables.
E.
INVERTER — The transformer converts the DC voltage into AC voltage that can be sold back
to the utility or consumed onsite.
F.
AC BREAKER or AC DISCONNECT — The AC breaker cuts power coming
from the inverter. The AC breaker does not stop power from feeding into the
transformer or from the solar array, it simply isolates and prevents AC voltage
from continuing into a breaker panel. This is why a label is posted showing the
location of all disconnects servicing a facility so that emergency personnel can shut
down everything related to power transportation.
G.
BREAKER PANEL — A breaker panel allocates the power into multiple circuits
with circuit breakers and fuses servicing various areas of the facility. In our homes,
we might call this a fuse box or breaker box. Each breaker might service different
WARNING DUAL POWER SOURCE
SECOND SOURCE IS PHOTOVOLTAIC SYSTEM
aspects of the building such as lighting, heating and ventilation, air conditioning,
offices, warehouse, etc.
H.
POWER ENCLOSURE — A power enclosure is simply a point where multiple power cables are spliced together.
I.
PRODUCTION / NET METER — A mechanism for monitoring the utilization of electricity. Meters are
typically used by the utility to calculate and bill for electricity consumption. Meters also can determine
power coming from the PV installation which then offsets the utility’s electrical usage, saving both energy
use and money.
J.
PAD MOUNTED TRANSFORMER — A device that transfers electrical energy from one circuit to another through inductively
coupled conductors, transforming utility scale voltages to voltages used by a dwelling or commercial building. This is typically
the point at which the utility combines and distributes power to the local area.
© HellermannTyton Corporation
LITPD268 Rev. 1, Printed 10.2013

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