Powell Power/Vac - N. PRIMARY CABLES

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43
Installation
01.4IB.67000
2) Cleaning Bus Insulation
Main bus bars are insulated with a high
temperature thermoset material having
excellent dielectric and mechanical
properties. When cleaning is necessary,
use a lint-free cloth or industrial wiper, or
a vacuum cleaner to remove accumulated
dust and dirt. Do not clean the bus by
blowing with compressed air. Dust and
dirt removed in this manner may be blown
into operating parts of the switchgear and
damage bearings or other mechanisms.
If wiping or vacuuming does not clean
the bus adequately, only distilled water,
denatured alcohol or isopropyl alcohol
should be used to remove any foreign
materials from the insulation surface. The
use of other solvents may result in severe
damage to the insulation system or other
parts of the equipment.
N. PRIMARY CABLES
The primary cable connections in
Power/Vac® switchgear are reached by
accessing the rear cable compartment.
When circuit breakers are stacked two-high
and primary cable terminations must be made
in both upper and lower units, the following
procedure should be followed:
Figure 35 Installation of Primary Cables
a
b
c
a. Batten
b. Trough
c. Pull Box
1. Remove rear bolted covers.
2. Remove batten (Figure 35, a).
3. Remove cable trough cover and pull-box
cover.
4. Remove cable trough (Figure 35, b).
5. If primary cables enter switchgear from
below, terminate cables for lower unit
first. If primary cables enter from above,
terminate cables for upper unit first.
6. Replace cable trough.
7. Terminate primary cables in remaining unit
(pulling cables through cable trough).
8. Replace pull-box cover, cable trough cover,
batten, and rear bolted covers.