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Phase
Bus
NEPSI interconnects internal
capacitor bank components with either Silver-plated
or Tin-plated Copper Bus Bar. Bolted Copper-to-Copper
connections are made with stainless-steel fastener.
Bus is supported with ANSI C29.1-1988 deep shed,
self-extinguishing A-20 Bus Support Epoxy Insulators.
Porcelain insulators are provided as an option.
Copper bus supports
and interconnections are designed to withstand
the thermal and mechanical stresses associated
with faults up to a short circuit level of 40kA.
Ground Bus
A full length Silver or Tin-plated Copper ground
bus is provided through the entire length of the
enclosure. The ground bus is pre-punched in the
incoming compartment for connection of customer
grounding conductor and shield drain wires. Bus
bar connection to enclosure is made with weld-on
studs to allow for maximum conductivity and minimum
connection resistance. The ground bus/enclosure
mating surface is cleared of paint and surface
treated with an approved electrically conductive,
corrosion resistant compound that reduces contact
resistance.
Options:
Bus Insulation: Bus bar insulation in accordance
with ANSI C37.20-1987.
Stainless
Steel Ground Pads: External Stainless steel
ground pad with NEMA 2-hole lug pattern for convenient
connection to customer substation ground mat.
Pads have two 1/2"-13 threaded holes and
are supplied with Stainless steel hex head bolts.
See picture on low right of this page.
Ground
Ball Studs: Ground ball studs can be provided
on all phase, neutral and ground bus to allow
for apparatus grounding clamps during maintenance.
Ground Bails:
Heavy duty grounding bails can be provided to
accommodate portable grounding equipment.
Notes:
Silver-plated Copper Phase and Ground Bus is provided
as standard unless specified by customer. Stainless
steel ground pads, bus bar insulation, and ground
ball studs, are not provided as standard and should
be specified if desired by customer.
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