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I need to interface volt free status contacts in the field ( hazardous area ) to my DCS through I.S barriers. The contacts in the field are auxiliary contacts from motor starters and valve limit switches. Can these contacts be wired straight to the I.S barriers or should the field devices to which these contacts belong also have I.S certification ?
Also what are the special features of field JBs for I.S circuits ?
Also what are the special features of field JBs for I.S circuits ?