I'm designing a panel for installation in a non-hazardous area that serves part of a hazardous area. If it was an all non-hazardous installation we would bond one end of the 4-20mA analog cable shield to ground for noise reduction. In this installation the transmitters are in the Class 1 Div 2 area and I'm using ISB's mounted in the panel outside the area. What do I do with the shield on the hazardous side of the ISB? NEC 504-50(c) requires grounding the shield but has an exception where the shield is part of an intrinsically safe circuit. In the event that I pick up noise do I just have to live with it?
ISB's and shields
- Thread starter kennyo
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