2.5mm bonding

[brizospark]

Carrying out a PIR on a large retail outlet I checked the bonding to the pipes under the sink in the kitchen area which were cross bonded with 2.5mm.

What is the minimum size the cross bonding should be?

The main earth to the board is 100mm!!!

 

[telectrix]

depends on the earthing system

 

[brizospark]

---tn-s

 

[telectrix]

i would be expecting to see 6mm for supp. bonding on TNS

 

[malcolmsanford]

Regulation 544.2.3 supplementry bonding to 2 extraneous conductive parts can be 2.5mm providing it as mechanical protection or 4mm^ without.

How old is this installation by the way if is as the kitchen sink is bonded.

 

[brizospark]

the install is 6 years old

 

[NMc]

544.2.3 does say not less that 2.5 if sheathed or otherwise protected with mechanical protection so if the earth is double insulated its ok but I guess it is only standard pvc single and possible all that the electrician had to hand at the time better than nothing

 

[brizospark]

Thanks for replies, it is indeed just G/Y single pvc 2.5

 

[tonys]

You should not be carrying out PIR's if you need to ask questions about bonding. This industry is becoming a joke.

 

[hsuelec77]

You should not be carrying out PIR's if you need to ask questions about bonding. This industry is becoming a joke.

yh mr know it all lol

 

[tonys]

yh mr know it all lol

Elaborate ?

 

[tony mc]

The PIR will be inspected to 17th edition but I was of the opinion that bonding kitchen areas is now out as its not a special location and supp bonding doesnt need to be installed.

I might of got the wrong end of the stick any veiws ????

 

[hsuelec77]

im sure theres been times when your not quite sure and have asked for some advice on this forum?

 

[tony mc]

IMO thats what the forum is all about better to ask and jog your memmory than to make a mistake thats my view any way !!!!!

 

[tonys]

im sure theres been times when your not quite sure and have asked for some advice on this forum?

No mate, not simple questions on bonding. I just open one of many reference books, ie BS7671 or GN8 if I have a query.