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r.b

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Is there a limit to how many floodlights a photo cell can turn on?.My other question is everybody has heard of 1.5 3 core armoured doing 70 watt and 150 watt floods on 6 and 10 amp breakers .What about the 400 watt floods obviously these soon mount up the amps carried if using quite a few on a circuit.What Im saying is Im sure I have used 2.5 3 core armoured before is it normal to use 10 ,16 and 20amp breakers on the 2.5 depending on the load? It must be surely?

 
Ive used 6mm cable for lights before,

the type of load [in this case] is fairly irrelevant,

simply design the circuit like any other,

load<ocpd<ccc

simples,  :)

as for the photocell,

see the data sheet supplied,

yes, there most likely will be a load rating, I very much doubt a single photocell controls all the lights at wembley,,,,,,,,,,

oh, and remember your VD and Zs on the cable size.

 
Is there a limit to how many floodlights a photo cell can turn on?.My other question is everybody has heard of 1.5 3 core armoured doing 70 watt and 150 watt floods on 6 and 10 amp breakers .What about the 400 watt floods obviously these soon mount up the amps carried if using quite a few on a circuit.What Im saying is Im sure I have used 2.5 3 core armoured before is it normal to use 10 ,16 and 20amp breakers on the 2.5 depending on the load? It must be surely?

Every switching device has a maximum load it can safely connect and disconnect without causing damage to the switch contacts. Therefore there is a limit to how many devices can be connected dependent upon their individual load ratings. No switch can operate an infinite quantity of lamps, there will always be a limit. Cable sizes and protective devices will be calculated proportional to the load, cable length any correction factors etc. (as Steptoe pointed out).This should all have been covered during the typical cable calculations done at college. Do they no longer teach the basics how to design a circuit based on all the normal criteria? This used to be regular part of the C&G coursework. such as 'What is the minimum size cable to a load x, y meters from CU, run in conduit, then buried under thermal insulation, then in a loft void with ambient temp of z degrees etc, etc.'  I would be very shocked if this is no longer covered on electrical courses. 

Doc H.

 
Every switching device has a maximum load it can safely connect and disconnect without causing damage to the switch contacts. Therefore there is a limit to how many devices can be connected dependent upon their individual load ratings. No switch can operate an infinite quantity of lamps, there will always be a limit. Cable sizes and protective devices will be calculated proportional to the load, cable length any correction factors etc. (as Steptoe pointed out).This should all have been covered during the typical cable calculations done at college. Do they no longer teach the basics how to design a circuit based on all the normal criteria? This used to be regular part of the C&G coursework. such as 'What is the minimum size cable to a load x, y meters from CU, run in conduit, then buried under thermal insulation, then in a loft void with ambient temp of z degrees etc, etc.'  I would be very shocked if this is no longer covered on electrical courses. 

Doc H.
no need for all those calcs. they only teach you:

1.5 lighting

2.5 sockets

6mm cooker, 8.5kw shower

10mm 9+kw shower

 
on the job i was on today a old Polish labourer turned up.

He was wearing a leather waistcoat.

I think the leather waistcoat is something us tradesmen here in the UK have missed out on.

 
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