Electrical load calculations

Less power than an old magnetic ballast with glowstart.

Page 12 tells me that an A2 class HF ballast uses 55W on a tube rated

Owain

Nothing

NT

If this is your house and of a normal size which you intend living in, just install the usual circuits. Like as regards lighting, one for each floor, with an additional one for the hall and stairs. I always use 1.5mm cable for the feeds which allows uprating of the normal 6 amp MCB later if needed. The costs of cable etc are tiny compared to the work involved, so it makes no sense to penny pinch.

None, I'd say.

In article , Part timer Mon, 30 Aug 2010 15:22:27 writes

Thank you very much. That is spot on.

Thanks also to the others who said the same thing - that there is no need to add an allowance for the modern ballasts.

I will use 40/60/70 W for 4/5/6 foot tubes as an estimate.

If you make provision for an electric oven and hob it would be wise to err on the cautious side as some models can draw quite a bit of power.

I have just stayed in a holiday cottage where the main switch for the cooker was at the back of a cupboard. I did wonder if this contravened any regulations. What was confusing was that there was another main switch which just operated the bob.

The old rule of thumb was to multiply the rated wattage of the individual flourescent batten by 1.8 - this is probably generous but its workable

In article , cynic Thu, 2 Sep 2010 12:56:49 writes

I do remember that - I used to just double it.

However, it does seem that modern electronic gear does not need any up-rating