CHAPTER 6 – ELECTRICAL INSTALLATION 102
Bolted connections
Material requirements
Use stainless steel bolts and nuts with the appro-
priate steel grade and property class for the con-
nection (recommended: A2-70 [designation
according to ISO 3506]).
Nuts with bonded coating can be used as an alter-
native to uncoated stainless steel nuts.
Connection type
The following connection type is recommended
when a cable lug (6-8: 4) is connected to a busbar:
• Spring washer (6-8: 1) and flat washer (6-8: 2) on
each side of the busbar (6-8: 3).
Other washers can be used, provided they
maintain the required contact pressure.
• Cable lugs suitable for M12 bolts.
Lubrication
• If stainless steel bolts and nuts are used, lubri-
cate the thread and head contact surface of the
bolt using recommended pastes, eg, Molykote
D paste.
If a coated nut (eg, with bonded
molybdenum-disulfide [MoS
2
]
coating) is used, the connection
does not have to be lubricated.
Tightening torque
• Tighten bolted connections with bolts of sizes
M10 and greater with the recommended nomi-
nal torque for the bolt size used.
6-8 Bolted busbar
connection
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