Bonding to Data Cabintet

[Ian1981]

Cabinet was all metal construction bolted together, with 4 earth connections in each corner of the cabinet and on wheels

 

[Wilko]

Just trying to understand
The supplementary bonding conductors link the extraneous conductive, exposed conductive parts and cpc in the room with the aim to establish an equipotential zone and reduce touch voltages during a fault. I'm not sure what the other parts are that will be linked by the proposed 4mm? (there's just a rack). Given the steel framed wall RCD to be used so any fault cleared pdq?

 

[Ian1981]

Just trying to understand
The supplementary bonding conductors link the extraneous conductive, exposed conductive parts and cpc in the room with the aim to establish an equipotential zone and reduce touch voltages during a fault. I'm not sure what the other parts are that will be linked by the proposed 4mm? (there's just a rack). Given the steel framed wall RCD to be used so any fault cleared pdq?

perhaps we should use the term connecting it to earth as we would an exposed conductive part (not convinced that a cabinet is this)rather than the term supplementary bonding.

 

[soms]

This may be something to do with other telecommunications standards (BS 6701, BS EN 50174-1, BS EN50174-2).
I haven't seen these standards myself, but have seen them mentioned in various places.
Research has only led me to find documents such as the one linked below which are specifications for installations in universities etc.
http://www.bristol.ac.uk/media-library/sites/estates/migrated/documents/structuredcabling.pdf

 

[Midwest]

I have done this for a data company who specified a 4mm supplementary bond to the metal cabinet.
There's maybe an argument of is it really a requirement but they insisted.
I supplementary bonded it from the supply circuit that fed the cabinet

How did you earth the detachable side panels, if it had any.

Rather strange, the avatar you two chaps (# 14 &15) use, are strikingly similar. You seem to argue a lot, are you actually the same person with a bipolar disorder

 

[Ian1981]

Rather strange, the avatar you two chaps (# 14 &15) use, are strikingly similar. You seem to argue a lot, are you actually the same person with a bipolar disorder

No!
I don't wear flares
I'll run it by my psychiatrist first tho.

 

[westward10]

Rather strange, the avatar you two chaps (# 14 &15) use, are strikingly similar. You seem to argue a lot, are you actually the same person with a bipolar disorder

I am in disguise, not sure what Ian's excuse is
Like his shades though.

 

[westward10]

Are they Tom Fords.

 

[Ian1981]

Not that posh.
They are FCUK

 

[westward10]

Cease fire over

 

[Ian1981]

Until tomorrow then .....

 

[MisterE]

Here's an old thread where this was discussed, with some links to other documents :-
Link

 

[Strima]

Have you tested to see if the cabinet is extraneous? TBH I would recommend IR testing as the MFT DC voltage could potentially damage any equipment within the rack but a continuity test between the MET and the rack would suffice. There is a calculation you can use for the maximum cable resistance but I can't find it at the minute, I'll try and dig it out.

This may be something to do with other telecommunications standards (BS 6701, BS EN 50174-1, BS EN50174-2).
I haven't seen these standards myself, but have seen them mentioned in various places.

I have a copy of the telecoms standards, complete waste of money as they basically say refer to BS7671, nice one IET...

 

[Strima]

I have found on calculation which will help on the TLC website but I'm sure there's another one also:

Supplementary boding conductors roughly halfway down.

TLC Electrical Supplies - https://www.tlc-direct.co.uk/Book/5.4.3.htm

 

[Startinez]

Slight sidetrack - I contract to Vodafone, EE, O2 etc. They bond everything! It's ridiculous just how much.