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DSEAR Query

BenM

Evening all,

First post here but long time browser.

I’ve got a site that has some Exd door contact switches which are pre-wired with the wiring encapsulated within the switch. These switches are mounted within a small Exd enclosure for mechanical protection. The gland on the 3 core flex/Exd enclosure is a bog standard plastic compression gland which I want changing to Exd compression glands.

This is the switch in question Switch. If it was simple apparatus within a plastic box I’d maybe agree but it is an Exd switch 250V AC 5A

The pressure is on to leave these compression glands as they are but I strongly disagree. At this time of night I haven’t got my books with me and can’t get on the BS site at the minute for some reason to quote the required reg/section etc.

Can anyone post a link or quote for me please or even put me right if I’m wrong.

Ta

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    The rating means that it is designed to prevent or contain any explosion that is due to gas or vapour build up and not to allow any ignition outside the container. It may or may not need a metal gland to do this - for example the internals may be potted and there is no volume in which an explosion of any energy is possible.

    If so a metal gland is not needed, and one that melts at about the same tempt as the cable is OK.

    The only folk who can answer that for sure would be the makers Allen Bradley. I;d want to verify with them before modifying it relative to the as-made condition.

    Mike

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  • 0

    The rating means that it is designed to prevent or contain any explosion that is due to gas or vapour build up and not to allow any ignition outside the container. It may or may not need a metal gland to do this - for example the internals may be potted and there is no volume in which an explosion of any energy is possible.

    If so a metal gland is not needed, and one that melts at about the same tempt as the cable is OK.

    The only folk who can answer that for sure would be the makers Allen Bradley. I;d want to verify with them before modifying it relative to the as-made condition.

    Mike

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