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Type of cabling supplying led vapourproof fittings

Baldyhugh

Hi all

ive a quick query I wouldn’t mind your opinion on. I have some ansell Tornado led vapourproof fittings to fit soon. They will be surface mounted using the supplied metal clips and the wiring will be pvc conduit and single stranded cable. I intend to enter the fittings through the end with a bit of flexible conduit and continue the stranded cable inside the fitting to the terminations which are about half way along the fitting. My query is that when the fitting is all assembled, the stranded cable will be resting on top of the metal ‘tray’ containing the led strips and driver which both actually give off quite a bit of heat after a while. Does ordinary stranded cable withstand a decent amount of heat? Previous fittings that I used had the terminations at one end so it wasn’t much of a problem but with this newer design, the incoming cable has to go half way up the fitting. I want to loop in/out inside the fitting instead of a plug in ceiling rose arrangement and don’t fancy having to put heat resistant sleeving  on each bit of stranded cable. Will the stranded cable survive lying on the metal tray long term?

Thanks in advance

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    I assume the cable in the conduit is singles with PVC insulation.  (this sort of stuff - is rated for 70C )You can get singles insulated with other materials, (this stuff is in effect XPLE rated 90C)  (silicone rubbers go to 180c ) but not so easily. And then there is the question of being sure that it is adequately meeting other criteria as it is a non-standard wire choice. (rather like using SY someone will point out it is not on the approved list and ask you to jutify...) If you are only using a short run is it possible to use immersion heater flex style high temp cable rather than singles ? (I appreciate it may not suit the conduit choice)
    How hot do the LEDS get - can you ask the makers or fit one with a temperature sensitive label (these ones record the peak by darkening next to the highest temperature reached, a sort of high tide indicator - then you know the scale of your problem). It may not be as bad as you think.
    Mike

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  • 0

    I assume the cable in the conduit is singles with PVC insulation.  (this sort of stuff - is rated for 70C )You can get singles insulated with other materials, (this stuff is in effect XPLE rated 90C)  (silicone rubbers go to 180c ) but not so easily. And then there is the question of being sure that it is adequately meeting other criteria as it is a non-standard wire choice. (rather like using SY someone will point out it is not on the approved list and ask you to jutify...) If you are only using a short run is it possible to use immersion heater flex style high temp cable rather than singles ? (I appreciate it may not suit the conduit choice)
    How hot do the LEDS get - can you ask the makers or fit one with a temperature sensitive label (these ones record the peak by darkening next to the highest temperature reached, a sort of high tide indicator - then you know the scale of your problem). It may not be as bad as you think.
    Mike

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