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Hi people,

when calculating max demand of a lighting circuit that already exists, do I count an emergency light as 100W like any other fitting, or at the max 8W that the fitting is rated at?

Thanks
 
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T

TonyM58

Stu, i would try it and see

what i mean is, try counting it at 100W, and see if the breaker and cable are correct.

If you find it goes over, then theres nothing to stop you taking it at 8W, because theres is no danger of someone replacing it with a higher wattage and overloading it

Thats why i would do anyway
 
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  • #3
Thanks for your input. The calcs come out fine at 100W per fitting and also including the extra lights that I intend to fit. But it did make me wonder that in the event that the limits where closer, what would be the apporpriate action?

My only concern would be that if somebody changed the emergency light fitting to a normal lamp holder, (for whatever reason). But I guess that would then be the responsibility of the installer / designer at the time.

thanks again
 
T

TonyM58

Stu,

depending on the cable size, theres nothing to stop you upgrading the breaker from a 6 to a 10A (assuming its a 6 now)

And theres nothing to stop you putting a note on your certs (and even on the dis board) saying that the emerg light should not be changed without redesigning the circuit.
 
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