Explosion proof actuator enclosures for hydrogen dispensers?

[HVACQuestions]

I have louvers that are within 50' of a hydrogen dispenser in a large warehouse. I think their actuators have to be inside explosion proof enclosures if it's within 25' but I can't remember where I read this in the code, it does not seem to be in IMC 2018... does anyone know where else this might be?

 

[Msradell]

What is the purpose of these dispensers and what is the quantity of hydrogen they contain/dispense? You may be into something much deeper than just explosionproof controls for the dampers. The entire area may need to be upgraded to class I div 1 and a detection system may be required.

 

[HVACQuestions]

What is the purpose of these dispensers and what is the quantity of hydrogen they contain/dispense? You may be into something much deeper than just explosionproof controls for the dampers. The entire area may need to be upgraded to class I div 1 and a detection system may be required.

I found it. It's NEC article 500, of all places. And you're correct, it's not just explosion proof actuators etc, it's a hazard class with all sorts of requirements.

 

[Msradell]

I found it. It's NEC article 500, of all places. And you're correct, it's not just explosion proof actuators etc, it's a hazard class with all sorts of requirements.

In a past life I worked at a chemical plant where we had large quantities of hydrogen that were used as a catalyst. Because of how explosive hydrogen is many precautions are required for detection of leaks as well as preventing a hazardous situation if there is one. Many of these items do not come cheaply.