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[tsb]

Could plastic capping be classed as 'mechanical protection' when using it to cover cable.

[fabriqnumba]

in short no it cant. mechanical protection is steel conduit or bury said cable 50mm deep from surface of wall.

[sparx]

hi, No, it's only function is to stop plasterers damaging cable!!!
Mechanical protection must be metel, & if more than say a plate across a single joist needs to be earthed as well, regards SPARX

[tsb]

Thanks sparx.So if you had 3 legths of metal capping,can you earth them together by drilling a hole in each length and linking them together with earth cable(what size cable please?)