Extending cold tails

[kazgaz]

Hi everyone.

Had the task today to lay electric underfloor heating.

I used a 12sq/m roll and a smaller 6sq/m roll. The 6sq/m roll cold tails need extending by around 4m to reach the smart thermostat.

The recommended cable that I should use in the installation manual is 2.5mm flex. I've got the flex but it looks considerably bigger than the cold tails.

Can I use flex with a smaller cross section? The 6sq/m roll pulls 840w max.

Picture enclosed.

Cheers.

 

[securespark]

What do the instructions say?

Last time I did this, the manufacturer said not to extend the tails.

 

[jj4091]

What do the instructions say?

Last time I did this, the manufacturer said not to extend the tails.

Did they explain why ?

 

[kazgaz]

What do the instructions say?

Last time I did this, the manufacturer said not to extend the tails.

Instructions said I can extend no issues.

 

[EFLImpudence]

Instructions said I can extend no issues.

Did they give a maximum length?

 

[kazgaz]

Answered my own question tbh.

I got some 1mm 3 core flex which is rated up to 2400w. Taking into account the heat mat in question pulls a max load of 840w, the 1mm flex is more than enough to use.

Thanks for the input tho guys, much appreciated.

 

[securespark]

Did they explain why ?

Can't remember, it was decades ago!