All Certified Flameproof/Explosion proof glands that use a sealing compound around the wires have one thing in common. They all have, what I have termed, an “anti wine cork” mechanism....
Rigid metal conduit (RMC) is sometimes used as a wireway in hazardous locations. Where RMC is joined together, a union is used. This union section must be wrench tightened to provide electrical conductivity if the conduit is likely to be come energized due to internal wires shorting to the conduit. ...
In an effort to harmonize with the International Electrotechnical Commission (IEC), the Canadian Electrical Code (CEC C22.1) has adopted the Zone System. As a consequence, the Class/Division system, * Hazardous Locations Section 18, was moved to appendix J18 in the 1998 edition of the Canadian Electrical Code....
Leakage currents from power supplies, undetectable by human touch, can be enough to ignite certain explosive atmospheres. Therefore, intrinsically safe (IS) barriers must be isolated from the “dirty ground” and connected to a “clean ground”. This starts at the mounting (DIN) rail of the barrier and continues all the way to the isolated IS ground....