Bonding

[securespark]

This is what I found at our local squash court. The tube is conduit, very badly stripped back
and the bonding is connected to the aluminium frame of the back wall of the court.

Should the bonding be MEB back to the DB?

 

[DESL]

How about this for a bond

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[Adam_151]

I'd say that is just about allowed, although perhaps maybe not in the spirit of the regulations

at first glance 543-02-08 would seem to dis-allow this, but it goes on to say "except as provided by regulations 542-02-02 ..."

543-02-02 allows a metal conduit as a protective conductor

So it would seem to be down to its copper equivelent area... you should find the formula next to table 54G.

Consider looking into 'selection and errection' of that BS951 clamp for another angle

 

[securespark]

That bonding cable is 4mm² though.

 

[Adam_151]

That bonding cable is 4mm² though.

Sorry, difficult to tell in photo.

get it on undersized bonding then, and if you get the remedials run a correctly sized bond back to the MET, job done?

 

[Spark123]

Is a piece of ally on the back wall of the squash court likely to introduce a potential different to that of the equipotential zone?

 

[securespark]

How different is it to an RSJ?

(This is beginning to sound like "Whose line is it anyway?", where they had to answer each question with another....

 

[Spark123]

Would it either be classed as an ecp? I suppose you can measure the resistance between said metalwork and MET (with bonds disconnected)

 

[securespark]

Thought exposed RSJ's had to be MEB'd??

(Doing well with the question continuity: keep it up!!)

 

[Spark123]

If they are in contact with the general mass of earth they should be bonded, as if the resistance between RSJ and MET is low enough. In the middle of a house surrounded by bricks/mortar, I doubt they will need bonded.
Is the bloke who bonded it 15th edition trained?
They were bonding door handles in the 15th weren't they?

 

[JohnD]

They were bonding door handles in the 15th weren't they?

Wire coathangers were bonded in my day.

 

[securespark]

My Gran's house was rewired in the early 15th. She had a bond to each metal window frame, then on each opening light, a loop across to ensure continuity...