Assumed current demand of lighting outlet?

[eveares]

Does anyone have a copy of the latest (5th eddition) Electrical Installation Design Guide on them and can look up the current demand assumed for a lighting outlet in a domestic setting?

I recall it has been updated from 100W to 30W, but I don't have a copy of the Electrical Installation Design Guide at hand to check. My Onsite Guide still says 100W under Appendix A, but that seems excessive in thisn day and age.

Any help much appreciated.

Elliott.

 

[JohnW2]

Does anyone have a copy of the latest (5th eddition) Electrical Installation Design Guide on them and can look up the current demand assumed for a lighting outlet in a domestic setting? ... I recall it has been updated from 100W to 30W, but I don't have a copy of the Electrical Installation Design Guide at hand to check. My Onsite Guide still says 100W under Appendix A, but that seems excessive in thisn day and age.

For what it's worth .... both of the documents you mention are only 'guidelines', and I would personally say that what is actually needed is common sense - which, in turn, suggests that even 30W is probably excessive "in this day and age", other than, perhaps, as an 'absolute maximum'

 

[Robin0577]

I agree...

This is no more than educated guesswork on my part, but given that the efficiency of an LED lamp is typically about 10x that of a traditional tungsten lamp, I would think 10w would be closer, perhaps 15w to allow some safety margin.

Random example: Philips A60 BC LED Dimmable classic bulb, warm white "100w equivalent" is 10.5w (That's not even a particularly efficient one by current standards)

 

[plugwash]

This is no more than educated guesswork on my part, but given that the efficiency of an LED lamp is typically about 10x that of a traditional tungsten lamp, I would think 10w would be closer, perhaps 15w to allow some safety margin.

Random example: Philips A60 BC LED Dimmable classic bulb, warm white "100w equivalent" is 10.5w (That's not even a particularly efficient one by current standards)

My thoughts on this.

1. The "random example" you found seems to be substantially more efficient than the house-brand bulbs I've looked at.
2. Not all lights were incandescent even in the pre-LED era. It was common to see flourescent battens in kitchens etc and the LED counterparts to those are often 30W or so.
3. Noone so-far in this thread seems to have thought about power factor! The power factor for an incandescent in close to 1, but many LED bulbs are much lower.

Taking all that into account, 30VA per point doesn't seem an unreasonable design allowance to me.