Nema 4 in Zone 2

[roywellsesq]

If Nema 4 or 4x enclosure containing passive/non sparking components(i.e. terminals) is suitable for use in a Class 1 Zone 2 Hazardous Area, can a PLC powered by 24VDC and switching 24VDC loads be installed in a Nema 4 enclosure and be suitable for Zone 2?

To go one step further can a PLC powered by 110 VAC and switching 110 VAC loads be installed in a Nema 4 enclosure and be suitable for Zone 2?

 

[kameele]

It can if it's listed for use in Class 1, Zone 2. Which my chart says is directly equivalent to Div 2. for instance, A-B micrologix is listed for Div 2. I don't think the relay versions are, just the solid state outputs. I know that there are many others and also good choices in 24VDC power supplies that meet that listing--just not enough time to look them up You would also have to be careful if you use any fuses in your application--only limited types are allowed in Div 2.

I'd have my doubts about a 120V powered one.

 

[jsl]

We use the AB 1763-L16BWA (120V pwr with six relay outputs), it is cULus listed for Class I Div 2 Grp ABCD, T3C. Relay outputs are hermetically sealed.
Great choice for low cost Div 2 controller with LCD and Modbus master/slave RS-485 capability.