34 UNIGEAR ZS2 INSTALLATION, OPERATION AND MAINTAINANCE INSTRUCTION MANUAL
6.1 Installation of busbars
CAUTION
Use proper personal protective equipment like
hand gloves, helmets, safety shoes, etc. while
handling switchgears. Accesses for the main
busbars installation are from sides and from
top of the UniGear ZS2 switchgear.
It is recommended to carry out busbar assembly
along with erection of individual switchgear;
utilizing the advantage offered by access from
sides of the main busbar compartment.
Insulated main busbars and droppers, and
shrouds are delivered as loose items.
Care shall be taken to protect the insulation
against damage during storage and handling.
When opted for insulated busbars, damaged
insulation shall be renewed. An air cushion type
PVC protective covering will protect the insulated
parts from damage during transportation and
installation. It is recommended to keep them
wrapped on busbars as long as possible, until
commissioning. Busbar assembly work calls
for cleanness as the dielectric strength will be
detrimentally affected by foreign objects like
metal dust, loose threads and oil patches.
Ensure that contact surfaces of busbars and
connector parts are clean. Use only the strong
type of conical spring-washers (ABB standard
9ADA334, DIN 6796) for all bolted connections.
This will help maintain required contact pressure
of the switchgear and minimizes the risk of
problem due to overheating. Torque meter
shall be used during erection, Recommended
tightening torques are as tabulated in Table 5.
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