STS 300 Series Electronic Indicating Ground Assembly

STS 300 Series Electronic Indicating Ground Assembly
STS 300 Series Electronic Indicating Ground Assembly
Installation and Operating Instructions
Note: Installation of this equipment should be
performed by a licensed electrician and according to all
applicable requirements of the NEC and local
Mounting: Four 5/16-18 mounting holes on the back of
the enclosure are provided to secure to Unistrut type
rack. Refer to Figure 1. Optimal height of the
installation is eye-level of the operator. A seal fitting is
required immediately before the supply conduit enters
the top of the enclosure. After wiring and testing, the
seal fitting is required to be filled with the proper
sealing compound. Failure to do so could result in
vapors and liquids being able to enter the enclosure
causing damage, explosion, bodily harm.
Electrical Connections: Refer to Figure 2. Supply
voltage should be in accordance with the rating specified
on the nameplate on the front cover. Connect supply
voltage to terminals 1 & 2. There are no connections to
terminals 3 & 4. Connect NO and NC closed contacts to
interlocking control contactors to permit operation of
pumps etc. when proper ground is detected. Do not
connect these contacts directly to motor loads.
An optional power on/off switch rated for the
environmental conditions can be installed to disconnect
power to the unit while not in use. This will extend the
life of the indicating bulbs.
Figure 1
Figure 2
A permanent ground cable (Type SOW or SOJ)
must be connected to the enclosure ground screw
and to a grounding bus or rod. Refer to Figure 3 for
Operation and Care:
Attach grounding clamp at the end of ground cable to
metal frame of vehicle, vessel, railcar, barge, etc. The
red light should turn off and the green light should turn
on when a good ground connection is made. At the
same time, all auxiliary contacts will change state,
allowing pump, blower, etc. to operate.
The ground cable should be inspected regularly to
insure there is no damage to the insulation. Damaged
insulation may impair the proper operation of the
grounding device. All hardware should also be checked
to insure proper tightness.
Figure 3
Special Technical Services Inc • 120 Stryker Lane Suite 405A • Hillsborough, NJ 08844
Phone (609) 259-2626 • Fax (609) 259-0044 • Email [email protected]
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