Double locknuts required?

[wireman]

Are 2 or 4 locknuts required if I use a RMC close nipple in this situation:

Two small dry-type tranformers are bolted together (back-to-back) and a close nipple is used as raceway between them. There is about a 3/4 inch gap between them, which is too long for a chase nipple. A ground wire is pulled between the two transformers and terminated properly. Article 250.97 does not apply because the voltage is only 120vac to ground (230 phase to phase). Insulated bushings are required because the wire size is #2AWG, but I need to know about the # of locknuts required.

 

[stew]

Re: Double locknuts required?

I would use 4 to meet the wrench tight requirement. Note actually I thought about this a bit and wrenckh tite is only absolutly required in haz locations I believe. As this is only a chase and serves no grounding purpose or rigidity requirement I think you are ok to use 2. ( I wouls still use 4. personal preference.

[ August 05, 2004, 09:07 PM: Message edited by: stew ]