I suspect the root cause of this was a loose connection and not conductor csa although it is obviously undersized.
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Discuss 8.5kw shower wires in 4mm, burnt terminals in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
even so, the 4mm would have handled that 8.5kW. it's down to poor terminations.The landlord said they told the electrican what shower they were getting. And the sparks installed it with the cable, he must have known it was 8.5kw.
Q+Q more like
May depend upon the reference method used for installation as 4mm installed in trunking de rates to around 30 ampseven so, the 4mm would have handled that 8.5kW. it's down to poor terminations.
I've told llthe landlord to get other electrican to call me if he has any issues returning to sort, also when I undid the isolator Fascia the cables just fell out the back.
I checked over the board before I disconnected the supply and some of the terminals were LOOSE :/
^^ even if I knew it was going to be a 7kw shower, I would still have fitted 6mm cable
You're quite right.10.0 doesn't prevent loose connections and burnt conductors.
Hi - not to disagree at all with ccc etc, but this pic does look like the heat is concentrated at the termination rather than evenly along the cable. And as the neutral seems unaffected (?) it perhaps suggests in this case the cause was poor termination of the line conductor?I had a similar situation yesterday.
Reports of shower isolator getting hot. Go to check it out. 6mm installed last year supplying a 9.5kw shower. Burnt out connections.
I would always install a 10mm if wirring for a new shower.
View attachment 37616
Hi - not to disagree at all with ccc etc, but this pic does look like the heat is concentrated at the termination rather than evenly along the cable. And as the neutral seems unaffected (?) it perhaps suggests in this case the cause was poor termination of the line conductor?
Reply to 8.5kw shower wires in 4mm, burnt terminals in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net