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Old 12-06-2011, 03:09 PM   #1
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Hey guys I'm new here and was hoping you could help me out with some code questions for Canada. What im needing to do is give a qoute to a client for and industrial application. He needs us to wire up 3 transmitters to a nema 4x stainless steel hoffman j-box 12X12X6 using armored cable and tmcx connectors. My question is can I use that type of box, do I need a purge system. all that will be in the box will be terminal block. It needs to be rated class 1 zone2, groups II2, t2d. My wholesale shop was told to make sure all parts were stamp for Canada CSA. Is there any thing else i should worry about. Thanks for the help my CSA code book is on order but hasnt made it here today.

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Old 12-07-2011, 02:12 AM   #2
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That type of box should be fine if the circuits are intrinsically safe or otherwise have limited power available for potentially being a source of ignition of the flammable gases. Because they will get in there.

I just finished up a sewer pump station that used a Hoffman box like yours for some float terminals. They're 120 volt circuits but they were fed through an intrinsically safe barrier. I figured they would want an explosion-proof box for it but the specs stated that a regular ol' stainless hoffman box would suffice.

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Old 12-07-2011, 02:15 AM   #3
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And I don't know if Canada's listing requirements are anything like the USA's, but here if you create a control box of some sort in the field, all the stuff you put in it needs to be UL listed. If you're a UL certified panel shop then you can use UL recognized stuff, and the whole assembly will be one listed unit.

The point is, from what I hear, it's sometimes troublesome to find listed (as opposed to recognized) terminal blocks.
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Old 12-07-2011, 08:53 AM   #4
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I was told all parts needed to be stamped cCSA for canada. The boxes are junction boxes for 3, 2wire, 24v transmitters.
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Old 12-07-2011, 12:24 PM   #5
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All parts must either be CSA approved or cUL approved or your client will looking at a very big expense when it gets up here. When ordering the parts I would suggest you pay specific attention to the wires, as I have seen American wholesalers to mistake UL rated cable with cUl Cable.
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