Earthing A Server Rack

[Andy™]

?

Like I said in in the PM I sent you, after you posted the same question again and sent it to me, it will not get you an answer any quicker. Everyone here answers in their free time when they can. which means you may have to wait. if you really want advice immediately, then I suggest you call a local sparky and book an appointment for them to come round, where you would be charged for their time.

 

[David_2013]

omg i just put a ? because didn't no if people see my message 

PS hope you'r not this rude to you'r customers

 

[kme]

Right.

David. You`ve had some very good ( & free!) advice so far;  because we`re friendly, helpful sort of peeps - for the most part.

So lets try this once more.

If the circuit you`re taking power from is a ring, and the rack has high ( >10mA) leakage:

You need EVERY socket on the circuit ( not just the one the server comes from) to have two earth terminals. The existing earth wires of the ring go (together) into ONE of the terminals; and the separate earth cable goes to the other, looping all the way around.

If its a radial, and the rack has high leakage:

The last socket on the circuit needs to have an earth taken back to the DB, separate to the earth wire in the circuit.

If it isn`t high leakage ( can be checked with a meter)  -not a problem; except that you may get nuisance tripping on a ring covered by an RCD, due to the additional leakage current from the rack.

As far as bonding the rack........I would at least ensure it was bonded to the servers & switch - and to the local supply. There are ways to achieve this - but, from your description, the tests needed are probably above your skill set ( no offence intended).

 

[kerching]

edited for clarity and to eliminate confusion

quote

Posted Yesterday, 11:55 PM

omg i just put a ? because didn't no if people see my message 

PS hope you'r not this rude to you'r customers           unquote

                                                                                      ?!!

the trouble with t'internet is that anybody can put their own interpretation upon the written word

just saying that CPC is closer to me than Andy.........................that sort of rhymes HAKU??

 

[kme]

:slap

Yes, what you said - and a slight inclination of the cranium is as adequate as a spasmodic motion of the optic cover to an equine quadruped with diminished visually capacity :slap

 

[David_2013]

Right.

David. You`ve had some very good ( & free!) advice so far;  because we`re friendly, helpful sort of peeps - for the most part.

So lets try this once more.

If the circuit you`re taking power from is a ring, and the rack has high ( >10mA) leakage:

You need EVERY socket on the circuit ( not just the one the server comes from) to have two earth terminals. The existing earth wires of the ring go (together) into ONE of the terminals; and the separate earth cable goes to the other, looping all the way around.

If its a radial, and the rack has high leakage:

The last socket on the circuit needs to have an earth taken back to the DB, separate to the earth wire in the circuit.

If it isn`t high leakage ( can be checked with a meter)  -not a problem; except that you may get nuisance tripping on a ring covered by an RCD, due to the additional leakage current from the rack.

As far as bonding the rack........I would at least ensure it was bonded to the servers & switch - and to the local supply. There are ways to achieve this - but, from your description, the tests needed are probably above your skill set ( no offence intended).

Try me

 

[NozSpark]

I thought that if the circuits a ring then you take each cpc to a seperate terminal at each socket and at the db,,,, then there's no need for an additional cpc to be run.... Except in a radial cct ,, seperated earths, last skt earth returned to db

 

[kerching]

On a tangent......

I had a customer years ago who i told had "too much leakage"

He asked if it could be cured with some silicone bath sealer?......seriously!!

 

[Blue Duck]

Should have given him a bucket to collect all the electricity...preferably a metal one :|

Not on a tangent...

@OP what sort of consumer unit / fusebox do you have? And do you have any equipment to test for ring continuity?

 

[Andy™]

omg i just put a ? because didn't no if people see my message 

PS hope you'r not this rude to you'r customers

yes, i did see your replies. but we dont sit around all day ready to reply immediately.

and im not that rude to customers, but there are some that i wont work for. chances are that would include you

 

[David_2013]

yes, i did see your replies. but we dont sit around all day ready to reply immediately.

and im not that rude to customers, but there are some that i wont work for. chances are that would include you

didn't say that but was no need to be rude 

Should have given him a bucket to collect all the electricity...preferably a metal one :|

Not on a tangent...

@OP what sort of consumer unit / fusebox do you have? And do you have any equipment to test for ring continuity?

i have a old rccb unit will post photos  and i don't have any 

 

[Blue Duck]

You out in the sticks? 100ma?

 

[David_2013]

l

You out in the sticks? 100ma?

lol yes i am bud

You out in the sticks? 100ma?

http://s1288.photobucket.com/user/David_Reason/media/CU/20140714_182428_zps840d5abf.jpg.html?sort=3&o=0

http://s1288.photobucket.com/user/David_Reason/media/CU/20140714_182405_zps52b68014.jpg.html?sort=3&o=1

30ma

 

[David_2013]

.

 

[Blue Duck]

Was wondering how much of a nuisance it may be? and also if the ring cct is continuous throughout it should disburse the the leakage somewhat.

If that makes any sense.