wires outside of the safe zone/zone of exclusion?

[ExArmy]

what needs to be done to protect wires that are buried inside the fabric of the building and not ran in a proper zone?

Am i right in saying you can run a wire wherever you like as long as it's either

• RCD protected
• mechanically protected
• or buried 50mm deep

 

[i=p/u]

more less, a ceiling is a safe zone and so is vertical and horizontal of accessories, but at 50mm or greater or requires earthed metallic protection or rcd.... badaa booom!!

 

[Deleted member 26818]

No not really.
You can protect any cable you want with an RCD.
However, if the sole means of protection is an RCD, then the cable must also be in a safe zone.

 

[i=p/u]

no diagonal , acute runs across walls he saying

 

[Deleted member 26818]

You can run diagonal or acute if the cable is at a depth greater than 50mm, or if less than 50mm, has an earthed metallic sheath, is in earthed conduit/trunking or has mechanical protection sufficient to prevent penetration by nails and screws.
Cables that are only protected by an RCD, must be in safe zones, i.e. not diagonal, acute etc.

 

[i=p/u]

id stick to safe zones anyway,but aye you are bang on , i will speak/teach this inside out 1 day

 

[ExArmy]

but in most places is A.D.S not the main means of protection, and RCD protection is additional?

 

[Deleted member 26818]

The additional protection required, is to stop people driving fixings through the cables.
Now it could be that the fixing catches both the line and either the CPC or neutral conductors, in which case ADS will kick in.
However, it could be that just the line is caught, and the resistance to earth is so great that ADS does not kick in, or not quick enough to protect someone.

 

[telectrix]

solution.... wooden nails.

 

[Paul.M]

solution.... wooden nails.

But you can only use a glass hammer

 

[i=p/u]

no more nails

 

[ExArmy]

However, it could be that just the line is caught, and the resistance to earth is so great that ADS does not kick in, or not quick enough to protect someone.

and in this case the fixing would become live, but if anybody were to touch it then the RCD would trip. so why is that not classed as a safe installation?

i'm not arguing with you by the way, i've looked it up and everything you've said is right but I don't understand why an RCD can not be used.

 

[telectrix]

yes, the rcd is there to protect some numpty who drives a nail into a wall directly above or below an accessory, but nobody expects a cable to be nowhere in line with an accessory. also, i would not like to trust my life to a £20 RCD made in the peoples republic.

 

[i=p/u]

so the 50mm then isit for you tell or what isit you trust