ICLL
Electrical
- Mar 22, 2006
- 13
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.
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.