stooperbike
Member
Looking for some information concerning Class I div I or div II panels. We are building a control panel that is mostly going to be a junction box for instrumentation and several motors. No starters or relays will exist in this panel, but there are several I to P converters. The customer has no classification for the room where this is going, there is the possibility in the event of leakage a small amount of hydrogen may escape into the atmosphere.( I cannont define "small amount") The control panel will be mounted on to a system skid. My question is, does this become a class I div II area where there is not normally going to be hydrogen in the area under normal operation? Or is it a class I div I area since in the event of a rupture there is the potential for hydrogen in the area? I am somewhat new to this and the NEC is a bit confusing when it comes to the div I or div II. We are planning on using a purge on the panel and I just want to make sure we use the right one. Also we are taking in RTD’s signals, some 4-20 signals, do IS barriers need to be supplied if the cables are going into a purged panel? Hope my questions make sense and thanks for the help.