Showing posts with label cahaya. Show all posts
Showing posts with label cahaya. Show all posts

Wednesday, April 21, 2010

Luminaires - Class of Protection

Luminaires are divided into three classes of protection according to the protective measures taken against electric shock.

  • Class I : Touch-accessible metal components connected to the protective conductor. The protective conductor terminal is indicated by a symbol. 
  • Class II : Live components are provided with additional protective insulation. Connection to the protective conductor is not allowed.
  • Class III : Luminaires operated on safety extra-low voltages (<42V) that pose no danger to human beings.

Degrees of protection IP

The mechanical design of luminaires must be such that they are adequately protected against the ingress of foreign bodies and moisture. the degree of protection is indicated by the IP numbering system."Ingress Protection"

The first numeral indicates the degree of protection against foreign bodies, the second numeral protection is against water.

An IP 20 luminaires , for example , is protected against the ingress of foreign bodies >12mm (2).but not against moisture (0).

A luminaire designed for use in damp interiors,with a degree of protection of  IP 65 is protected against dust (6) and against jets of water (5).