earthing for server racks

DEAR,

EARTHING FOR SERVER RACKS - BEING ELECTRONIC DEVICES, HAS TO BE SEPERATE ...

ISOLATED FROM THE ELECTRICAL EARTH ELECTRODES.

JUST PROVIDE ELARTH ELECTRODES HAVING TOTAL EARTH RESISTANCE < 1 OHMS.

CONNECT THEM VIA INSULATED WIRES UP TO THE EARTH PIN OF SERVER SOCKETS.

CHECKS :

1. Voltage between Neutral pin & earth pin of server socket should always be less then 5 Volts ( for best results, less then 1 Volts )

2. Neutral of the supply system ( near distribution transformer ) is solidly grounded with earth resistance of < 1 Ohms and Such that Volts between Electrical earth terminal and Neutral terminal at user's point should always be less then 5 Volts - under any unbalanced / full load conditions

Hellow, Check the TIA-607-A

1. You can download APC white paper

2. PANDUIT White paper

3. NEC Article 250

Guest,

Depending on your needs and how much of an issues this is will depend on what is right for you.

1) For a single rack setup, Earth the Rack Chassis to the Earthpoint in the power supply.
Since Rackmounted servers & communications equipment is designed for this application this method will suffice.

2) The other alternative is to install a dedicated technical or reference earth and connect the rack chassis to this earth. This provides a cleaner earth point, but may cause other undesirables such as earth loop currents.

I would stick with Option 1 for your application.

Regards,
Sapper