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Intrinsically safe equipment in non-incendive application.

Intrinsically safe equipment in non-incendive application.

Intrinsically safe equipment in non-incendive application.

(OP)
Can equipment certified EEx ia suitable for zones 0, 1, 2 be safely installed and used in an installation requireing Ex n zone 2 certification?

RE: Intrinsically safe equipment in non-incendive application.

Possibly. Ex'n' is usually used as the cheapest way of complying with Zone 2 requirements. Intrinsically safe installations being their own set of requirements and skills. What does your client say?

RE: Intrinsically safe equipment in non-incendive application.

(OP)
We are replacing some old equipment, client simply requested Exn suitable for zone 2 IIB T3.

We have plenty of stock of intrinsically safe instruments, it was suggested this is good for zones 0,1,2 so would be OK but I thought there may be more to it than that.

RE: Intrinsically safe equipment in non-incendive application.

IS installations require a dedicated earth, segregation, barriers, and so on. Does your client have any other IS gear on site? It has benefits, but it isn't a free lunch.

RE: Intrinsically safe equipment in non-incendive application.

(OP)
They have no IS equipment in the installation area, no barriers etc. they do not want an IS system but just maintain the existing Exn system, I suppose the question is can you introduce an IS instrument into a Exn system.

RE: Intrinsically safe equipment in non-incendive application.

Not without all the other stuff, i.e. barriers, dedicated earths, etc.

RE: Intrinsically safe equipment in non-incendive application.

(OP)
ScottyUK thanks for your replies, it turns out the item in question is triple certified IS, Exd, Exn for the North American FM/CSA models but the ATEX models we have are individually certified.

So even though they are physically the same devices new Exn models have been ordered to ensure the correct certifcation.

RE: Intrinsically safe equipment in non-incendive application.

No problem. Multiple-certified devices can sometimes get confusing. smile

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