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What contactor size for a 9kw electric boiler

Hi all. Don't have much experience on this topic. Called to a job with an electric boiler. It has a dedicated 10mm supply from a 50A MCB. I narrowed down the fault the the contactor which was only feedig 1 of tge 3 elements and had scorching marks around the other 2 terminals. And is currently...
- Brendo
- Thread
- Jun 1, 2018
- boiler contactor electric size sizing
- Replies: 34
- Forum: UK Electrical Forum
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TT system earth cable size.......

Hi guys At a job doing a re wire and the electrician i was with is changing the earth cable over from 16mm to 6mm He says as its a tt system that it only needs a 6mm. Is this right?
- magnoliafan89
- Thread
- May 30, 2018
- cable cable size earth size system tt system
- Replies: 28
- Forum: UK Electrical Forum
Swa as cpc what size ?

Dear all Testing a garage that is fed in 2 core swa using the swa as cpc Live and neutral are 2.5mm. I know the swa is fine as a cpc but I’m unsure what size to put on certificate for it Seen a table that says it’s equivalent to 17mm but in the back of my mind I remember you need to divide by...
- dnjr
- Thread
- May 15, 2018
- cpc size swa
- Replies: 9
- Forum: UK Electrical Forum
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what size wire do i need for welder in garage

Hi garage 37 metres away .From main consumer unit in house to a consumer unit in garage 47 metres .The garage runs off 2.5 swp under ground and operates lights 6 amp and a 32 amp ring everything works ok for what I used it for ,now I am thinking of running a welder .So my question is would you...
- poke
- Thread
- Mar 16, 2018
- garage size supply welder wire
- Replies: 26
- Forum: DIY Electrical Advice
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Shower upgrade and mcb size

Hi there.I am looking to upgrade my daughters shower in her flat.The shower is a 7.5kw at the moment,but is struggling with producing a decent temperature with the weather as it is.I was aanting to put in a 9.5kw instead.I have checked the cable from the mcb to the pull switch,and by posts i...
- Paul Lathan
- Thread
- Mar 4, 2018
- mcb shower size upgrade
- Replies: 18
- Forum: UK Electrical Forum

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