Two Independent Types of Protection Providing EPL Gb

Electrical equipment shall comply with the requirements of two independent Types of Protection that provide EPL Gb. If one Type of Protection fails, the other Type of Protection shall continue to function.

The independent Types of protection shall not have a common mode of failure. Examples include:

Tourchlight with Exd and Ex e housing and an Ex ib circuit

Electric motor complying both EN 60079-1 flameproof Ex d and EN 60079-7 increased safety Ex e.

Measuring transducer with IS circuit type ib and flameproof enclosure Ex d

Pressurised apparatus Ex px with increased safety enclosure Ex e