A process room contains a piece of machinery rated Class I Zone 1 internally, Zone 2 externally. An auxiliary piece of equipment rated Class II Zone 22 is being added. What are the requirements for the Zone 22 item; does it need to be dual-rated for gas & dust? Is there a requirement for 1-meter distance between Gas/Dust Zones similar to Zone
Can 480V power wiring and fiber optic cables be installed in the same conduit per 2020 NEC? What are the requirements and/or restrictions?