Immersion Heater in 1.5mm flex

Midwest · Jan 29, 2016

GEOFF S said:
Hi

I find this a strange remark, 1.5mm is a minimum and with some cables inadequate. Unnecessary means excessive, so what is excessive about installing 2.5mm cable, the cost, crikey?

Ill give you some pro's, you give the con's

Lower operating Temp
Less Volt Drop
Lower I2R
Can be used as a supplemetary bonding conductor
A longer life span
More Robust
Pretty much all flexible cables even derated will be okay.

Cheers

Sorry didn't want my reply to say strange.

I was just suggesting that, in my example the 1.5mm flex was suitable for the designed load. 2.5mm is also suitable, but as you eluded to, slightly more expensive. The bigger flex is slightly more difficult to install, but not totally impracticable. I guess the reason I would use, is that the smaller cable is suitable & more cost effective, and however small that might be (approximately 80p per metre?), that can be passed onto the customer.

As to pros & cons, I'm not sure, over the length of cable normally used for connections to immersion heaters, whether your pros would have a huge impact on selection, but I'm willing to be convinced otherwise. Perhaps you could expand.