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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Protection Methods

Increased Safety


Equipment using flameproof switches in
increased safety enclosures.
(Courtesy of Cooper Crouse-Hinds)

 

Increased safety Increased safety:
Identified on equipment as type "e" is defined as a type of protection applied to electrical equipment that does not produce arcs or sparks in normal service and under specified abnormal conditions, in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks.

For example For example:
This technique is often used for motors and fluorescent fixtures that have no arcing or sparking parts., this type of protection may be used in enclosures that have only terminals but no switches or relays. Hubs and connectors of the type shown on the enclosures here may be used because the enclosures use increased safety for the terminations (with flameproof switches inside) so the enclosures and fittings do not have to vent flames or hot gases.

This type of protection, along with flameproof and intrinsically safe equipment, are the most commonly used methods in Zone 1 areas.

LocationsLocations:
This protection technique shall be permitted for equipment in Class I, Zone 1 or Zone 2 locations.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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