Bonding to Data Cabintet

[cprfenom]

Evening Folks.

Can anyone point me in the direction of any regs that define what bonding is required to a data cabinet?

The cables will be CAT 6 and the supply for the switch will be a dedicated circuit socket. I am coming down on the side of 4mm2 as I assume it needs a supplementary bond only?

Regards

 

[Wilko]

Not sure I understand why it needs bonding?

 

[cprfenom]

As its likely to introduce a potential?

In fairness I am coming from a point of view of no real experience. I have often seen bonding to cabinets and they have often been 10mm2, but as stated i cannot see any solid information in the regs

 

[Wilko]

Extraneous?

 

[Leesparkykent]

Evening Folks.

Can anyone point me in the direction of any regs that define what bonding is required to a data cabinet?

The cables will be CAT 6 and the supply for the switch will be a dedicated circuit socket. I am coming down on the side of 4mm2 as I assume it needs a supplementary bond only?

Regards

It may require earthing but I doubt bonding. If you install a seperate green and yellow then 2.5mm is the minimum CSA if mechanically protected and 4mm if not. You will not find any regulations specifically stating about earthing or bonding data cabinets.

 

[westward10]

Fit a PDU panel for the power which will earth the rack, some come with an earth fly lead.

 

[cprfenom]

Its a wall cabinet that is installed in a steel framed building fed by a TT. It isn't extraneous per say.

It is a small private building owned by a school

 

[cprfenom]

Fit a PDU panel for the power which will earth the rack, some come with an earth fly lead.

Thats an idea. Thank you

 

[telectrix]

is the cabinet bolted to the steel structure?

 

[cprfenom]

It may require earthing but I doubt bonding. If you install a seperate green and yellow then 2.5mm is the minimum CSA if mechanically protected and 4mm if not. You will not find any regulations specifically stating about earthing or bonding data cabinets.

Can I ask if i just go with a 4mm bond, can that be a fly lead from the socket or will it go back to the MET?

 

[Wilko]

Have a look at 544.2.5 which might be helpful ?

 

[cprfenom]

is the cabinet bolted to the steel structure?

Its wall mounted on a plasterboard wall that is secured to metal stud built within a steel frame structure

 

[cprfenom]

Have a look at 544.2.5 which might be helpful ?

The circuit is fed in 2.5/1.5 and I understand that 1.5mm isn't large enough?

 

[Ian1981]

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

 

[westward10]

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

 

[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