Imported: rondo battens when to bond?

Post Reply
User avatar
DougP
Posts: 242
Joined: Sun Apr 12, 2020 10:11 pm
Answers: 3
Has thanked: 19 times
Been thanked: 31 times

Imported: rondo battens when to bond?

Post by DougP »

crocket
Nov 20 2013 22:44


Is it always necessary to bond rondo batterns?
Stainless benches connected via plastic pipes?

dlink
Nov 20 2013 22:54


why would you want to in the first place ???? no rule requiring it, and no touch potential. there is such a thing as too much earthing/bonding

WireDr
Nov 21 2013 10:44


I have been to house where the rondos where not boned and the rondo grid was livened. You as a sparky would not be happy when crawling in that situation.

killy
Nov 21 2013 12:21


WireDr,
surely not, our new act rules and standards would not let this happen........

zl2aj
Nov 21 2013 14:47


See 5.4 of 3000.

Broadly

- Is it conductive (metallic etc)?
- Is it exposed? (1.4.53)
- Is it not fully isolated? (is there a risk it could become alive)
- Is it readily accessible? (1.4.2)

If you get 4 yeses then bond.

Jacks
Nov 21 2013 16:58


@ Zl2aj, Thats pretty Broad

1) Is it conductive (metallic etc)?
A rondo batton is so thats a yes

2) Is it exposed? (1.4.53)
Yes it is , BUT 1.4.53 does not apply as a Rondo Batton is not a conductive part of electrical equipment.

3)Is it not fully isolated? (is there a risk it could become alive)

Well Rondo batton may or may not be fully isolated , it will depend on the installion .

4)Is it readily accessible? (1.4.2)

If you read 1.4.2 you would have to answer No in most cases

So No not four yes\'s there .

1.4.54 Extraneous conductive part is the more relevant definition from 3000 , and section 5.4.6 is the Relevant clause specifically


justsuppose
Nov 23 2013 11:46


metal framed building with cable passing through it, ovre edges of steel beams.. often through un bushed holes.. and weve got comments saying no need to bond it.. every accessory box fixed with metal selftappers bring the possibility of a L- E fault pressure or loose wire.. if installing new circuits could always carry out a trailing earth test to the frame to verify then bond if reading too high.. see 5.4.6.2... id go as far as to say that the main bonding point to a steel domestic framed building should be visible & accessible also noted by consumer unit where connection is.

Jacks
Nov 23 2013 12:34


Justsuppose you read the posts again ! I don\'t see anyone saying the metal structure of a building does not have to be earthed .
Read section 5.4.6














Apprentice
Nov 23 2013 18:39


Also don\'t forget there is a difference between Earthing and Bonding. In the case of rondo battens, it would be earthing.

I think it\'s a good idea to earth them. In the case that a gib fixing screw pierces the cable into the phase conductor, then as said above, the whole grid becomes live just waiting for some unlucky sparky to touch.

Also, the whole grid becomes live because the guys who install the rondos put a link between each room for the specific purpose of earthing them, because so many sparkies over the years have asked them to.

dlink
Nov 23 2013 19:18


if your stupid enough to run your cables within the rondo, then you deserve to have a builder put a gib screw through your cable. which would mean you havn\'t protected your cables from mechanical damage, nor the required 50ml clearance.

Apprentice
Nov 23 2013 19:36


Have to agree with you there, running cables within rondo is stupid, almost retarded.

But the risk still remains even if you run your cables perpendicular to the rondo, some rondo are not as deep as others, and the screws can protrude beyond.

Apprentice
Nov 23 2013 19:37


And the 50mm clearance only applies to cables that aren\'t RCD protected.

daniel2
Nov 24 2013 10:28


What sort of a numpty would bond each rondo batten in a house? What sort of numpty would let the cables drape across rondo battens and not properly secured to timber with pin clips or with catenary wire?
Post Reply