Cable run under floorboards

[Iain123]

Hi Group

Had a third party inspection by a NAPIT tester, to get building control approval for a pv installation.
He has failed the cable run in Twin and Earth under my floorboards even though its greater than 50mm from surface. No 30ma RCD fitted to this circuit.

I though it was acceptable if the cable was 50mm or greater from the top of the joists?
Thanks for advice in advance

Iain

 

[Darkwood]

Maybe he's pulled it because you are too close to the ends of the joist thus a structural issue?

If not ask for more details and regulations that you have supposedly broken.

 

[davesparks]

Dave, could you please read my post again that you've taken my quote from.

You'll see that I'm agreeing with you that cables below the floor and above ceilings do not need rcd protection.

Post 11

I stated that the 50mm rule only applies to walls (ie. T&E cables buried less than 50mm require RCD protection unless otherwise protected)
You replied stating that it also applies under floors

What is there to misunderstand?

 

[HappyHippyDad]

Dave, could you please read my post again that you've taken my quote from.

You'll see that I'm agreeing with you that cables below the floor and above ceilings do not need rcd protection.

Post 11

To be honest Andy I also read your post as meaning cables below need RCD protection, at least the second part looks like that and the first part looks like you don't think it needs RCD protection!

 

[andyb]

I stated that the 50mm rule only applies to walls (ie. T&E cables buried less than 50mm require RCD protection unless otherwise protected)
You replied stating that it also applies under floors

What is there to misunderstand?

The misunderstanding was because I took 'Since when has running a cable under floorboards/above a ceiling required RCD protection?' To mean just that and I agreed with you.

And 'The 50mm reg is applied to cables buried in wall' to mean that cables below floors do not need to be burried >50mm and I disagreed with that.

 

[andyb]

To be honest Andy I also read your post as meaning cables below need RCD protection, at least the second part looks like that and the first part looks like you don't think it needs RCD protection!

Fair enough HHD, but if you read my posts I've said that on the face of it this installation does not require an rcd.

 

[DuaneMHunt1976]

522.6.100

Onsite Guide
7.3 Installation Considerations
7.3.1 Floors and Ceilings
Where a low voltage cable is installed under a floor or above a ceiling it must be run in such a position that it is not liable to be damaged by contract with the floor or ceiling or the fixings thereof. A cable passing through a joist or ceiling support must :

I) be at least 50mm from the top or bottom, as appropirate or...
II) have earth armouing or an earthed metal sheath, or
III) be enclosed in earthed steel conduit or trunking, or
IV) be provided with mechanical protection sufficient to prevent penetration of the cable by nails, screws and the likes (NOTE: this requirement to prevent penetration is difficult to meet), or
V) from part of a SELV or PELV Circuit

 

[davesparks]

The misunderstanding was because I took 'Since when has running a cable under floorboards/above a ceiling required RCD protection?' To mean just that and I agreed with you.

And 'The 50mm reg is applied to cables buried in wall' to mean that cables below floors do not need to be burried >50mm and I disagreed with that.

You can disagree all you like, but that doesn't make it a regulation.

Cables can be run in notches provided steel plates are fitted over the notches. Purpose made plates are available for this exact purpose.

 

[davesparks]

522.6.100

Onsite Guide
7.3 Installation Considerations
7.3.1 Floors and Ceilings
Where a low voltage cable is installed under a floor or above a ceiling it must be run in such a position that it is not liable to be damaged by contract with the floor or ceiling or the fixings thereof. A cable passing through a joist or ceiling support must :

I) be at least 50mm from the top or bottom, as appropirate or...

522.6.100 does not exist

You have not included the 'or' so appear to be deliberately misrepresenting the regulation to falsely make a point.

If you are going to quote a regulation please quote the full regulation, not just part of it.

 

[andyb]

You can disagree all you like, but that doesn't make it a regulation.

Cables can be run in notches provided steel plates are fitted over the notches. Purpose made plates are available for this exact purpose.

You like an argument Dave,

I covered all that in post 6,

I'm just trying to help the op not show everybody how clever I am. So with that said I don't think that I can add much more to this thread and I'm getting bored with having to constantly defend myself.

 

[DuaneMHunt1976]

it was in the GREEN Version but isnt in the YELLOW
and have another look edited it just before your reply

 

[davesparks]

it was in the GREEN Version but isnt in the YELLOW
and have another look edited it just before your reply

And the green book is no longer in effect.

 

[DuaneMHunt1976]

yep and your CORRECT there, i didnt noticed they had taken it out

 

[davesparks]

They haven't taken it out, they've messed with the wording and remembered it.

They have to justify the ridiculous cost of a new book so they just remember a lot of regulations and adjust a few words to make the list of changes look bigger.

If you have a look at an old regs book, like the 13th edition you'll find that some regulations haven't changed at all, they just move them around and give them new numbers

 

[7029 dave]

You can disagree all you like, but that doesn't make it a regulation.

Cables can be run in notches provided steel plates are fitted over the notches. Purpose made plates are available for this exact purpose.

Would you.?That method is all them yesterdays. lol

 

[davesparks]

Would you.?That method is all them yesterdays. lol

Yes I would if necessary, same as I have done in the past.