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Discuss underfloor heating in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

D

drayton

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Hello, with regard to underfloor heating mats, the new regs 753.411.3.2 state, "in the case of heating units delivered without exposed conductive parts, a suitable conductive covering, for example a grid with a spacing of not more than 30mm shall be provided on site as an exsposed-conductive-part above the floor heating elements ". the unit I use has an earthed screen around the cables. Whats the purpose of the above, it wont provide any mechanical protection ?. can someone enlighten me, Cheers Drayton.:confused:
 
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S

Shakey

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Because this must be on its RCD, its ensuring that any breakdown of the live conductors gets picked up by the earth system (hence the screening or grid)
 
D

drayton

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Yeh, Thats my point , the wire mat system has an earthed screen which if there is a breakdown on the live conductors, the RCD will trip, I dont get why there needs to be a separate exposed earth grid, or am I being thick.
 
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