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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> underfloor heating cable https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1319125576 Message started by steveo on Oct 20^th, 2011, 4:46pm

Title: underfloor heating cable
Post by steveo on Oct 20^th, 2011, 4:46pm

ive just installed some underfloor heating cable in my kitchen but when i test the resistance i only get a reading of 13 ohms when it should be 45 any idea what could be causing the problem

Title: Re: underfloor heating cable
Post by Lectrician on Oct 20^th, 2011, 5:31pm

A cheap meter!

What do you get when you short your meter together?

Title: Re: underfloor heating cable
Post by steveo on Oct 20^th, 2011, 6:46pm

the meter is fine i got a 45 reading before the floor was tiled do you think the wire could be damaged and if so how do i trace the damage

Title: Re: underfloor heating cable
Post by CWatters on Oct 20^th, 2011, 10:38pm

Have you wired several mats in parallel?

Title: Re: underfloor heating cable
Post by Lectrician on Oct 21^st, 2011, 7:01am

If the cable was damaged you would expect the reading to go up, or go up to open circuit (greater than your meter would measure).

To go lower is odd, you would need atleast two points of damage and very wet adhesive to get a reading like that IMO.

Are you measuring end to end? What reading do you get from both ends to earth? What reading do you get when you short your meter probes together?