saluki_engineer
Member
- Location
- Colorado
I am working on a design for a mixer with a local control station that will be located in a Class 1, Div 2 area. We specify that the high-temp and moisture-sensing switches must utilize an IS barrier due to the classified nature of the room where it is located. The vendor submitted a design showing the IS barriers in a NEMA 4X rated local enclosure that includes the local HOA switch and will be located in the same room as the mixer.
My question is, is it ok to have the IS barrier in the classified area as long as it is in a NEMA 4X enclosure? I would assume that since we have an HOA switch with 120V control voltage coming to it, that this is ok, but another engineer has suggested to me that the relays can't be located in the classified area.
Thanks in advance for the help.
My question is, is it ok to have the IS barrier in the classified area as long as it is in a NEMA 4X enclosure? I would assume that since we have an HOA switch with 120V control voltage coming to it, that this is ok, but another engineer has suggested to me that the relays can't be located in the classified area.
Thanks in advance for the help.