Dual earth terminals for computer circuits

[brizospark]

Noticed this on the architects notes can someone elaborate for me? thanks

the contractor should note the need for dual earth terminal blocks to be provided within DBs supplying computer power

 

[Simlec]

Page 67 (red) OSG

 

[Silly Sausage]

IT equipment have high earth leakage currents so need 'High Integrity Earthing', the cpc should be connected to separate terminals on each socket on such a circuit and if it's a radial circuit a cpc should be taken from the last socket back to the DB.
Have a read of this...
http://electrical.------.org/wiring-matters/26/5437-earthing.cfm?type=pdf

 

[netblindpaul]

Noticed this on the architects notes can someone elaborate for me? thanks

the contractor should note the need for dual earth terminal blocks to be provided within DBs supplying computer power

Please tell me you are joking?

 

[telectrix]

Please tell me you are joking?

if you ain't come across it before, you won't know. i know a few sparks who are " old school" had never heard of high integrity earthing till recently.

 

[sparkdog]

I believe the type of earthing circuit depends on how high the total earth leakage current from the computers is.I am doing two rows of 4 and one of 2 at the moment,radials and each row has its own RCD.I will check the leakage current but I expect it to be very low.

 

[netblindpaul]

if you ain't come across it before, you won't know. i know a few sparks who are " old school" had never heard of high integrity earthing till recently.

Well they should have because it is not "that" new, if they want to be classed as professionals then they must act as such.
Sorry my opinion stands, if the OP does not know then back off and get someone who does.

 

[GLENNSPARK]

Well they should have because it is not "that" new, if they want to be classed as professionals then they must act as such.
Sorry my opinion stands, if the OP does not know then back off and get someone who does.

I thought the idea of this forum was to gain advice for things you are not sure about....the rudeness of some posters on here is breathtaking...........

 

[SW1970]

I've just done a PIR on a large home office that had 10 PCs in and on day of test there was 27mA of earth leakage on the dedicated RCD circuit for those PCs (therefore approx 3mA per PC). Client reported occasional trips. Solution is another RCD as above. Thank heavens for the ramp test!

 

[Des 56]

I thought the idea of this forum was to gain advice for things you are not sure about....the rudeness of some posters on here is breathtaking...........

I did my apprenticeship in the sixties in maintenance and at the time "I knew it all"or so I thought

I found during my career,mainly installation, that others knew things I had no idea of

Conversely,they were blind to subjects I thought were fairly routine

You see where this is going to

The only thing I will say is this,
Electrical work is a vast area, and one that luckily is covered by someone or other on this forum

Reciprocating your knowledge is what the forum has been, and I hope will continue to be
Some give of their knowledge freely.others not so perhaps,but where would the forum be, without all of us lacking something or other to acquire

 

[GLENNSPARK]

I did my apprenticeship in the sixties in maintenance and at the time "I knew it all"or so I thought

I found during my career,mainly installation, that others knew things I had no idea of

Conversely,they were blind to subjects I thought were fairly routine

You see where this is going to

The only thing I will say is this,
Electrical work is a vast area, and one that luckily is covered by someone or other on this forum

Reciprocating your knowledge is what the forum has been, and I hope will continue to be
Some give of their knowledge freely.others not so perhaps,but where would the forum be, without all of us lacking something or other to acquire

THATS THE SPIRIT DES!....Most posters on here are out to offer advice and guidance whilst gaining some themselves. I look at it like this...if it wasn`t for institutions like this forum you`d end up with loads of installs "going wrong" at some point or another: We need someware to share advice and have a laugh whilst doing so...we`d all go mad if we didn`t..lol..:grinningelf:

 

[Deleted member 26818]

I believe the requirement for high integrity earthing has been around since the 15th became the 16th.

 

[Geordie Spark]

I thought the idea of this forum was to gain advice for things you are not sure about....the rudeness of some posters on here is breathtaking...........

I agree.

That said, every forum has its smart@rse though.

 

[jaresquire]

Stick me in front of large motor control gear and I'd have to go into BS mode and I don't mean 7671!

 

[dagrat]

Couldnt agree more Glennspark, surely people should be encouraged to ask when they are unsure, rather than be criticised for not knowing.

 

[Knobhead]

Stick me in front of large motor control gear and I'd have to go into BS mode and I don't mean 7671!

Stick me in front of a modern CU and I look confused, give me the MCC anytime. Don’t get me wrong I’d soon suss it out but it’s foreign territory to me!

Until I came on to this board I didn’t even know a MCBO existed.

 

[ezzzekiel]

Well they should have because it is not "that" new, if they want to be classed as professionals then they must act as such.
Sorry my opinion stands, if the OP does not know then back off and get someone who does.

In which case dont bother replying to the thread - your comments are neither useful or wanted

 

[Silly Sausage]

Well they should have because it is not "that" new, if they want to be classed as professionals then they must act as such.
Sorry my opinion stands, if the OP does not know then back off and get someone who does.

If I had a tenth of this guy's knowledge I'd be a $£%&ing electrical genius.

 

[telectrix]

i did 16th in 1995 and no mention was made of hi integrity earthing then. it was only in 1998 when working in factory offices that i came across it, and that was after 25 years in the trade. as i said before, if you ain't met it, you don't know.

 

[SW1970]

I first came across them in 1988 in a telco lab environment.