4mm cable, 32a breaker for 16.2kw Rangemaster installed by electrician

[swaRRR]

I always find it odd when someone employs a fully qualified electrician and then questions everything they say.

 

[brianmoooore]

Ordinary T&E may be rated at 70 degrees, but that's hotter than the maximum allowed from a domestic hot water tap. If I installed a cable in a domestic property that ran at anywhere near that temperature, I'd expect the customer to be on the 'phone pronto.

 

[DPG]

I always find it odd when someone employs a fully qualified electrician and then questions everything they say.

He didn't. The electrician refused to connect it up.

 

[timhoward]

Personally I’d go with MI cos you can guarantee the one time it’s all on and trips will be Christmas Day and I don’t want you call me

I was also thinking about Christmas Day - there's a country estate I look after that only has a 3 phase 100A supply for multiple dwellings, and Christmas Day is the reason that I as an electrician have been insisting on changing a few cookers to gas!

I always find it odd when someone employs a fully qualified electrician and then questions everything they say.

Be fair. The questions only started when a 2nd fully qualified electrician disagreed, and then what chance does Joe Public have of working out who is right? (I'd privately decided it was unlikely to be ok until it was established it is clipped direct.)

 

[UNG]

Ordinary T&E may be rated at 70 degrees, but that's hotter than the maximum allowed from a domestic hot water tap. If I installed a cable in a domestic property that ran at anywhere near that temperature, I'd expect the customer to be on the 'phone pronto.

The cable running hot is one thing but how often are the terminations going to be checked for thermal creep and heat damage

 

[Pretty Mouth]

Ordinary T&E may be rated at 70 degrees, but that's hotter than the maximum allowed from a domestic hot water tap. If I installed a cable in a domestic property that ran at anywhere near that temperature, I'd expect the customer to be on the 'phone pronto.

I don't think it will get to that temperature in this case. Expected load is <28A, with the cable rated at 37A, it shouldn't get anywhere near that hot.

 

[Chris C300]

I always find it odd when someone employs a fully qualified electrician and then questions everything they say.

...Because a second qualified electrician would not fit the appliance the first qualified electrician fitted, saying it was wrong and wouldn't last. Therfore, I turn to gain a consensus somewhere for assurance... thanks again for the advice from everyone.

 

[Vortigern]

I tend to liken this to a commuter travelling a hundred miles each day to and fro for work. He can drive a fiat 500 or a nice two litre car. The strain on a 500 cc engine would wear the engine much faster than a 2l engine. Hence I would at least fit 6mm² cable for the longevity ensured.

 

[Intoelectrics]

All appears to be fine and the circuit safe to use, assuming the installing electrician is accurate with the details of the cable run, installation method, diversity and de-rating factors.

Me personally, though the diversity applied is fine, I always feel (and this is just my personal opinion not a professional judgement) that for cookers it can often seem a bit low. I understand and accept that maybe for general day to day use this would work perfectly fine. But still I would most likely either be a little more over cautious and go a size bigger than what calculates or ask the client what the likelihood of the cooker being used more than general is.

For example a good friend of mine's wife is an avid baker and spends many days in the kitchen baking, cooking probably much more than most normal households. In this scenario she would more than likely use much more than the applied diversity factor predicts.

At the end of the day Chris its your call, the circuit installed by all accounts calculates fine for intent and the installing electrician has provided evidence to suggest this.

 

[Gc1971]

Hello all.
I'm the first guy.
I couldn't fit the oven not because I refused to but because I was on holiday.
Are those saying you need 6mm on a clipped direct no derating factor 32a circuit saying they disagree with the iet table? I'm not trying to be argumentative, I'm just following the book. Surely the iet have checked these as a long term load.
Cheers
Gc