Stack Lights for Class 1 Division 2

[steve66]

For an open face spray booth, do stack lights within 3' of the face of the booth need to be listed for use in a class 1 division 2 location?

The NEC handbook has some commentary that seems to indicate lights within the class 1 div 2 area only need to be totally enclosed and guarded. But it refers to 517.6(B), which only applies to lights above the class 1 div 2 area.

 

[rbalex]

Luminaries in a classified location still must meet the requirements of Section 501.130. This does not require specific listing for Division 2; however, it does require a comprehensive list of marking requirements or specific testing. [Sec 501.130(B)(1) & 500.8(C). Also see Section 500.8(C)(6)(a).]

Luminaires above the classified location that may release arcs, sparks or hot metals don't require marking beyond those required for "ordinary locations", but must be effectively guarded against releasing them into the classified location.

 

[steve66]

Luminaries in a classified location still must meet the requirements of Section 501.130. This does not require specific listing for Division 2; however, it does require a comprehensive list of marking requirements or specific testing. [Sec 501.130(B)(1) & 500.8(C). Also see Section 500.8(C)(6)(a).]

Luminaires above the classified location that may release arcs, sparks or hot metals don't require marking beyond those required for "ordinary locations", but must be effectively guarded against releasing them into the classified location.

Thanks for the reply. Now that I think about it, these might not be luminaires at all. They are more of a signal light. Here is one model I was looking at:

https://www.bannerengineering.com/u...ors/90mm-domed-indicators-k90-series.html#all

501.105 Meters Instruments and Relays, paragraph (B)(2) allows general purpose enclosures for resistors, resistance devices, ..., and similar equipment if "the max. temperature of any exposed surface will not exceed 80% of the ignition temp of the gas or vapor involved."

These are sealed (IP67) LED devices, so I'd say there aren't any exposed surfaces that will even be warm. Am I correct, that these would be allowed, or do they need to have a temp. rating marked on the device?

 

[rbalex]

I've had to do some serious parsing on this one. There was nothing in the manufacturer's literature that would clearly allow Section 500.8(C)(4) Exception to apply. If it did apply Section 501.105(B)(2) Exception probably would too. My "gut feel" is that it would because 100C would boil water, but I just can't be sure. I'd prefer a T-Code.

 

[steve66]

I contacted the manufacturer, and they have some similar lights that are rated for a Class 1 Div 2 area if they are supplied through an intrinsically safe barrier.

I'll play it safe and have the contractor use those.

 

[rbalex]

I contacted the manufacturer, and they have some similar lights that are rated for a Class 1 Div 2 area if they are supplied through an intrinsically safe barrier.

I'll play it safe and have the contractor use those.

That's fine I suppose but I'd sure like to see the control drawing they intend to supply. It sounds a bit strange that it would need an intrinsically safe barrier for Division 2. All they would need is to get a T-Code certified.

 

[steve66]

That's fine I suppose but I'd sure like to see the control drawing they intend to supply. It sounds a bit strange that it would need an intrinsically safe barrier for Division 2. All they would need is to get a T-Code certified.

Here they are. I had to divide into 2 pdfs to get it small enough to upload.

They do list a temp. class - T130C. Maybe the barriers aren't needed for a division 2 location?

 

[rbalex]

The data sheets from Post 3 indicate the product is NRTL certified, the "IS" data sheets aren't - but the second sheet from the second set definitely have control drawings.

"ATEX" and "IEC Ex" are not recognized NRTL marks. US domestic certification requires an "AEx" mark.

"T-code"/Temp Class suitability will depend on the flammability of the material involved, but T4 is usually fine.

Still don't see why they don't get a T-Code mark for the NRTL products.