AS NZS 60598.2.2:2016 pdf free

AS NZS 60598.2.2:2016 pdf free.Luminaires
Flexible cables or cords used as a means of connection to the supply, when supplied by the luminaire manufacturer, shall be at least equal in their mechanical and electrical properties to those specified in IEC 60227 or IEC 60245 and shall be capable of withstanding without deterioration the highest temperature to which they may be exposed under normal conditions of use. Materials other than p.v.c. and rubber are suitable if the above requirements are met.
Considerable care is needed in deciding whether a recessed luminaire is operating within its thermal limits in an existing lighting installation. It is even more difficult to predict whether a luminaire will be satisfactory in a proposed installation and a “mock-up” is usually required. In the past, there have been instances of overheating of luminaires, for example, overheating owing to the presence of heating services above the ceiling plane.
The following procedure is for measuring the ambient temperature in which the luminaire operate. The ta rating of the luminaire should be at least equal to this ambient temperature.The ambient temperature is measured in the plane of the ceiling (or other mounting surface) at the mid-point of a typical cavity. It is important that all other luminaires in the installation and all other services which may affect the thermal conditions of the luminaire are operating.The cavity is covered above the measuring point to prevent a non-typical interchange of air and So that the cover may absorb extraneous heat which would be absorbed by the luminaire.
The test recess may also approximate to the thermal conditions above a suspended ceiling if the larger air volume is offset by heat-emitting services. In a particular installation, more onerous thermal conditions than this may exist and it is, therefore, essential to carry out a practical check. Conversely, the space above the ceiling may have free air movement and no heat-emitting services; for such an installation, the ta rating of the luminaire as determined in the test recess incorporates a temperature margin and the ta rating may be exceeded if the manufacturer of the luminaire has verified that operation in the particular installation will be satisfactory.AS NZS 60598.2.2 pdf free download.