Nonincendive Circuit Switching device

[jaketoby]

The company I work for does not use NonIncendive devices. These devices are tested under Normal condition for Class 1 DIV 11. We only install devices tested under fault condition ex. I.S. or Explosion Proof.

Recently we have found field devices install in this plant that have an NI rating. We were discussing the safey aspects of this device which led to the control drawing for this switching device. The way we read ISA 12.12 or FM Class 3611 a control dwg is required for installation. The manufacture says a control drawing is not necessay for a device with the rating marked on the device. We think this statement is wrong. The control drawing should show the install procedure and the limit form our equipment to the device. Example: Power limit, current limits, voltage limits.

How do you interpret the code? We have remove the devices from our plant.

 

[rbalex]

What you are describing is a non-prohibited company practice; in other words, you can choose to continue your current practice and simply loose the economic benefit of nonincendive wiring practices in Division 2.

The NEC does not necessarily require all nonincendive rated elements of a nonincendive field wiring system to be associated with a fully proscriptive Control Drawing. It is often sufficient to simply document how a specific piece of nonincendive apparatus may be integrated into the wiring method.

PS. I'm truly sorry I didn't respond earlier; I was absent long enough that you and another poster were victims of having your posts marked as "old" and I usually only scan "new" posts.