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Bolts and nuts for Electrical Termination in outdoor use

Q. Can any expert explain the galvanized BOLTS and Nuts can be used for Electrical Termination in outdoor use? Please suggest I am in urgent need of this answer.

Velusamy Narayanasamy
user - Qatar
July 15, 2009

A. For outdoor use, I don't recommend galvanized nuts and bolts for electrical connections.
Reason: the zinc forms insulating oxides which will give you a high resistance connection. If you are carrying high current through this connection, you'll get overheating. If its a high voltage, you'll get arcing. If both V & A are high you could get a fire! Arcing on a zinc connection is not good, you'll get burning of the unoxidized zinc, giving off fumes of ZnOxide.

You could try brass.

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK

July 22, 2009

Q. Can we use Stainless Steel bolt for termination @ secondary side of Pad Mounted MV Transformer (e.g 500KVA/13.8-0.480/0.277KV) for outdoor installation?

Ulysses Bustillo
- Saudi Arabia
December 20, 2011

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