We recently had some construction work done on some well heads in which the contractor installed TMC connectors on some explosion proof transmitters. This is a Class 1 Zone 1 area. The transmitter is explosion proof, factory sealed, conduit seal not required. We are using Type MC-HL cable with Crouse-Hinds TMC Terminator fittings. Article 505.16(B)(7) states that a seal off be used no exceptions. Article 505.16(B)(2) addresses the exception of conduit seals when using factory sealed equipment, but does not address type MC-HL cable in the exception. This was approved by the contractors Administrator and engineer. I was wondering if anyone knew how they came to this conclusion? The way I interpret this is we should be using TMCX fittings rather than the TMC's.
Any help is appreciated. Thanks,
Any help is appreciated. Thanks,