Installation in Class 1 Div 2 Area

[eric9822]

We are in the process of installing an eyewash station in a Class 1 Div 2 natural gas compressor yard, I rarely do any work in classified environments so I would like some input. The eyewash station has an integral flow switch with dry contacts that activates a local horn/strobe and also feeds back into the plant control system. The control system I/O and the power source are located outside of the classified area. From what I see in articles 500 and 501 it looks like the switch and local horn/strobe need to be listed for hazardous locations. Rigid threaded conduit and flexible liquidtite conduit are acceptable raceways. Seals and explosion proof conduit bodies are not required. Is this correct? Thanks.

 

[weressl]

We are in the process of installing an eyewash station in a Class 1 Div 2 natural gas compressor yard, I rarely do any work in classified environments so I would like some input. The eyewash station has an integral flow switch with dry contacts that activates a local horn/strobe and also feeds back into the plant control system. The control system I/O and the power source are located outside of the classified area. From what I see in articles 500 and 501 it looks like the switch and local horn/strobe need to be listed for hazardous locations. Rigid threaded conduit and flexible liquidtite conduit are acceptable raceways. Seals and explosion proof conduit bodies are not required. Is this correct? Thanks.

Insufficient information to answer.

 

[eric9822]

Insufficient information to answer.

OK. What other information would help answer the question?

 

[rbalex]

OK. What other information would help answer the question?

It isn't always easy to picture what a poster has clearly in mind and a simple Yes/No is usually an inadequate answer to ?Is this correct?? You did ask some more specific questions that I hope I can at least point you in a proper direction.

...From what I see in articles 500 and 501 it looks like the switch and local horn/strobe need to be listed for hazardous locations...

This is basically correct. Remember the equipment must be ??identified not only for the class of location but also for the explosive, combustible, or ignitable properties of the specific gas, vapor, dust, or fibers/flyings that will be present.? (underline added) [500.8(B)(1)] This doesn?t necessarily mean that the marking will include the name or chemical formula of the ?specific gas, vapor, dust, or fibers/flyings,? But it does mean all the items in 500.8 (C) & (D) must be addressed.

...Rigid threaded conduit and flexible liquidtite conduit are acceptable raceways...

This is also basically correct; however review 501.30 and especially Subsection (B) carefully for LFMC bonding requirements.

...Seals and explosion proof conduit bodies are not required...

This is the most problematic. Explosionproof conduit bodies are probably not required; but without knowing the construction details of the switch and the local horn/strobe and boundary conditions of the wiring method, the seal requirements are impossible to determine from the OP.

 

[weressl]

It isn't always easy to picture what a poster has clearly in mind and a simple Yes/No is usually an inadequate answer to ?Is this correct?? You did ask some more specific questions that I hope I can at least point you in a proper direction.

This is basically correct. Remember the equipment must be ??identified not only for the class of location but also for the explosive, combustible, or ignitable properties of the specific gas, vapor, dust, or fibers/flyings that will be present.? (underline added) [500.8(B)(1)] This doesn?t necessarily mean that the marking will include the name or chemical formula of the ?specific gas, vapor, dust, or fibers/flyings,? But it does mean all the items in 500.8 (C) & (D) must be addressed.

This is also basically correct; however review 501.30 and especially Subsection (B) carefully for LFMC bonding requirements.

This is the most problematic. Explosionproof conduit bodies are probably not required; but without knowing the construction details of the switch and the local horn/strobe and boundary conditions of the wiring method, the seal requirements are impossible to determine from the OP.

All could be also non-incendive or even intrinsically safe, including the horn/strobe. It also depends on the local AHJ as to what does he accept as a non- heat or arc-rpoducing device. Does he require DIv. 2 labeling or are units acceptable without labels due to their nature of construction. Does he accept manufacturers declarations?

 

[rbalex]

All could be also non-incendive or even intrinsically safe, including the horn/strobe. It also depends on the local AHJ as to what does he accept as a non- heat or arc-rpoducing device. Does he require DIv. 2 labeling or are units acceptable without labels due to their nature of construction. Does he accept manufacturers declarations?

That's why is said it was "problematic;" too many possibilites were still out there. As we narrow them down we will ultimately get Eric a solid answer.

 

[eric9822]

Thanks to both of you for the information so far. I'll peruse the code sections listed over the weekend. The flowswitch, the horn, and the strobe are general purpose devices so I plan on removing them and installing devices that are listed for a class 1 div 2 or div 1 area. I planned on using 110VAC since that is what the plant control system utilizes.