Do I need to use trunking ?

[MTBOO]

Hi
Having underfloor (laminate) heating mats installed those foil mat types . Doing some work in preparation for electrician to come in and wire it all up. installed patress box next to double socket ready for fused spur and one above it for the heating controller. Need to know if I need to install trunking to protect cable. Cables will be in safe zone but room is converted garage with plasterboard and pinkish type insulation behind it. I have put in white plastic round teunking for cable from top control box down to FCU but for small distance between FCU and floor, do I need any. Cable can just hang down to floor but not sure if I need anything. Bit fiddly to get something in in the lower part. Cable will be directly behind plasterboard up against the insulation but in safe zone

 

[westward10]

Why are you not asking your electrician.

 

[westward10]

Why are you not asking your electrician.

 

[suffolkspark]

Whats the loading of this mat ? Has your electrician said its ok to spur off the ring?

 

[DPG]

As above, just give your sparky a quick ring. You'll have the correct answer in less than 5 minutes. Can't see why you're spending time asking on here. Are you doing the job yourself? Best to be honest if you are.

 

[telectrix]

and ufh is notifiable work, and a pink pig has just flown overhead.

 

[Deleted member 9648]

Why are you not asking your electrician.

There wont be one.

 

[westward10]

Yes I think most of us thought this at #1

 

[KentSparky]

Nice!!
Google says if the cables are not more than 50mm in the wall they should be mechanically protected and/or backed up by RCD. Since the cable is just behind the plasterboard and curvy it is RCD protected at the CU and we are going off a fused spur I’m going to assume plastic trunking just behind the plasterboard will be ok.

Trunking behind the plasterboard will be ok but the question is why? What is the point?

 

[dksanders]

Each underfloor heating circuit should be on it's own 16A MCB protected circuit and not spured off of the ring main.

 

[NDG Elecs]

Doing some work in preparation for electrician to come in and wire it all up.

Going off your previous posts I don't believe your quote above is a truthful one.
What's the worst that could go wrong with wet naked bodies and electricity flowing just beneath your feet....but it's RCD protected so it will be fine...yeah course it will cos you have tested the RCDs and they are good to go.
Courtesy goes a long way in life. Hoodwinkery does not.

 

[elsparko]

that "pinky" looking stuff is fireboard, you cannot make holes in it, so surface mounted conduit system is the general go to, but you could also frame it out infront of the fireboard to give a void to run cables.

 

[davesparks]

Nice!!
Google says if the cables are not more than 50mm in the wall they should be mechanically protected and/or backed up by RCD. Since the cable is just behind the plasterboard and curvy it is RCD protected at the CU and we are going off a fused spur I’m going to assume plastic trunking just behind the plasterboard will be ok.

Plastic trunking is not acceptable as mechanical protection for buried cables. If mechanical protection is required it must resist penetration by screws, nails, drills etc or be of an earthed metallic type.

 

[davesparks]

Each underfloor heating circuit should be on it's own 16A MCB protected circuit and not spured off of the ring main.

Why do you say each heating circuit should be on its own 16A circuit? We have not been given any information as to the actual load so how do you know what size circuit is required?

 

[dksanders]

Why do you say each heating circuit should be on its own 16A circuit? We have not been given any information as to the actual load so how do you know what size circuit is required?

The manufacturers instructions for all the systems I've installed have required it and I take Appendix 15 (ii) which states "... not supplying comprehensive electric space heating or loads of a similar profile from the ring circuit" to preclude it as well.