ABB MNS-MCC, Инструкция по установке, эксплуатации и обслуживанию

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27 I N S TA L L AT I O N , O P ER AT I O N S A N D M A I N T EN A N C E M A N UA L
The Ground bus bar bolt connector sections
should be between every section of a seismic
or ARC lineup.
Tighten the two (2) M8 bolts using a 13mm socket
wrench. Torque the bolts to 28 +/- 2 N-m. It is
recommended to use a 13mm socket with an
integral universal joint, to easily access and
tighten all of the bolts. The MCC must be grounded to the ground system
designed by either a star or delta connection and
the resistance must be a minimum of 0,001 Ω to
ensure a good residual energy drain.
Note:
Do not use abrasive cleaners on the
bus joints. Failure to follow this instruction
can result in high resistance connections.
Additional connections to the central ground
system and the MCC ground bus can be made at
any point on the perforated ground bus. Ground
cables should not be run in conduit and should
take the most direct path to the site ground.
Refer to the Torque table at the end of this manual
for tightening torques for horizontal busses bolted
connections that include: main, neutral and ground
bus bars.
Bolt connector
sections
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41
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41 Ground bus bar bolt
connector section