Q. What are the requirements for grounding metal equipment racks supporting computer servers?

A. The Code requires 'bonding' not 'grounding' as follows: All exposed metal parts of an information technology system must be bonded to the equipment grounding conductor [645.15]. This 'bonding' requirement is accomplished when the metal equipment rack is secured and in direct electrical contact with the metal case of the servers, which are connected to an equipment grounding conductor as per 250.134 [250.136(A)].