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Locknut on cable compression gland in hazardous area

Locknut on cable compression gland in hazardous area

Locknut on cable compression gland in hazardous area

(OP)
Can anyone advise if it is considered essential to fit a locknut to the inside of a compression gland for a steel-wire armoured cable entering a threaded cable entry in an ex'e' enclosure in a Zone 2 hazardous area?

I can understand that the locknut would be essential to maintain earth continuity of the cable armour if the enclosure entry was not threaded (e.g. a punched hole in a glandplate). In fact the gland could fall right out if there was no locknut.

But in a threaded entry, what purpose does the locknut serve? The fastening tension and earth continuity is between the gland and the entry thread. The locknut seems like a nice to have. Does it really add some security? Would the assembly fail a hazardous area inspection without the locknut?

IEC regulations in an Australian oil and gas application.

RE: Locknut on cable compression gland in hazardous area

With Canadian hardware it may depend on the threads. With tapered pipe threads there would not be a need for a locknut. If the hardware has non-tapered threads a locknut may be a good idea, but I would not expect to see straight threads on our Ex hardware.

Bill
--------------------
"Why not the best?"
Jimmy Carter

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