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Discuss no discrimination in sockets & lights in the Electrical Forum area at ElectriciansForums.net

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I have came across a problem where the sockets and lights are run on a same circuit and it's done in a way where the person have put probably junction boxes in the walls which are not accessible and only 1 cable is coming to sockets , light switches and lights.
I can't put fcu to discriminate as one cable to switches.
is there any way i can discriminate socket and lights without running a new circuit?
any help would be much appreciated.
 
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Rpa07

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What size are the cables and how many sockets and lights involved?
10amp mcb on the whole lot to cover smallest cable?
 

ipf

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Seems like a real mess......but how can anyone help on a forum with virtually no useful info.
Help…... Hands on definitely needed.
Advice.....get someone qualified in to investigate.
 
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  • #4
thank you for responding rpa07
most sockets and some lights are wired in 2.5mm flex some lights are run on 1mm again flex.
some numtys dine the job.
 
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  • #5
I'm sorry new to the forum so appreciate your patience.
it's run of a 20A mcb and there are 6 sockets and 3 lights on it.
 

Spoon

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As above. If the customer doesn't want a proper fix then just change the breaker to protect the smallest cable in the circuit.
 

Pete999

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What they said "ipf and Spoon"
 
Tin hat on...
If the cable is 1.5mm you could probably get away with a 16a mcb to do the lot.
If you have 1mm then its either rewire time or a 10amp mcb but this will likely trip if someone plugs in a heavy load like a portable heater
 

Wilko

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Hi Bill and welcome.
Out of interest, what has brought you to the house? Is there a fault or do they want some new works?
 
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  • #11
thank u guys its lovely to have you lot to hand.
Wilko to your question its a shop and they gave the contract to dodgy builder who just f****d all of it up. they have have 2 2kw heaters running on same circuit aswell and instead of tapping the end of circuit in CU the guy put a 13A plug and plugged directly onto a cc tv circuit double socket which was running on a 10A breaker. so every time they turned the heaters on it tripped. To keep the costs down as they don't want to drop everything apart i secured the sockets with 20A breaker but when it came to the lights i can't so much.
its a stupid question but is there any single pole Fcu available?
 

Rpa07

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Can you wire new feeds to provide power to the 2 heaters? What other heating source is there? If central with radiators then get rid of the 2 electric heaters but still bring down the mcb rating to 10 as the rest is probably low load items.
Not easy that one.
Who is holding the ‘purse’?
 
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