Am2 exam question bonding cable tray/ metal trunking?

[RyanF]

Hi everyone,

I am sitting my AM2 exam a week today and was wondering if the metal trunking, cable tray etc needs bonded back to the MET in the board?

Will you fail if its not bonded or will it be a minor?

Anyone got any ideas?

Thanks.

 

[westward10]

Metal trunking will generally require an earth if it contains low voltage circuits with continuity to the MET but not necessarily a direct connection to it. Cable tray does not however this is highly debated and you should do some research to enforce your actions if you decide to or not.

 

[DavidSpark]

You are not required to bond the cable tray that is already pre-installed for you during the AM2.

 

[RyanF]

You are not required to bond the cable tray that is already pre-installed for you during the AM2.

So I wont loose any marks if the metal trunking or cable tray is not bonded. I thought though thay any exposed metal part than can become live under fault conditions and easy touched is supposed to be bonded? Or im I wrong?

 

[LeeH]

Metal trunking will generally require an earth if it contains low voltage circuits with continuity to the MET but not necessarily a direct connection to it. Cable tray does not however this is highly debated and you should do some research to enforce your actions if you decide to or not.

What’s the debate against it westy?

If it’s extraneous or part of the electrical installation it gets bonded on my jobs. (Unless it’s fastened to something that already is. Steel frame work etc.)

Cheers.

 

[westward10]

If extraneous then yes but this is not always the case with tray work.

 

[LeeH]

Yes of course but note the OR part of the installation.

 

[Ian1981]

So I wont loose any marks if the metal trunking or cable tray is not bonded. I thought though thay any exposed metal part than can become live under fault conditions and easy touched is supposed to be bonded? Or im I wrong?

 

[Jamie']

not needed for your AM2

 

[westward10]

Said before Ian you will get in trouble doing that

 

[Strima]

Not required on the AM2.

 

[RyanF]

View attachment 40641

Thats great thanks for replying!

 

[RyanF]

Not required on the AM2.

Just curious have you sat your AM2 exam ? If so you got any hints and tips on passing?

 

[MJPD29]

All containment it already in place for am2 no need to touch any of it

 

[RyanF]

All containment it already in place for am2 no need to touch any of it

I underatand that the containment systems are already in place but, surely that means I can still bond it to the MET etc. Surely I wont just leave it?

 

[Strima]

Just curious have you sat your AM2 exam ? If so you got any hints and tips on passing?

Here you go.

The AM2 and what to expect.pdf

 

[telectrix]

you don't bond trunking, you earth it as it is an exposed metal part and may or may not form part or all of the cps/s for the circuit/s within. tray normally carries sheathe cables and as such would only need bonding if it were extraneous.

 

[Strima]

I underatand that the containment systems are already in place but, surely that means I can still bond it to the MET etc. Surely I wont just leave it?

There is no requirement on the AM2 to carry out any bonding of the pre-installed containment/tray etc. Unless the assessor syas otherwise, don't bond it.

 

[LeeH]

you don't bond trunking, you earth it as it is an exposed metal part and may or may not form part or all of the cps/s for the circuit/s within. tray normally carries sheathe cables and as such would only need bonding if it were extraneous.[/QUO

I don’t agree with the last part.

EMC and ATEX requirements say otherwise.

 

[Ian1981]

Said before Ian you will get in trouble doing that

Why?