Grounding and the Use of the Signal Reference Grid in Data Centers
The signal reference grid (SRG) is a network of copper wires typically installed below a raised floor in a data center as shown in Figure 1. An SRG can also be constructed of flat copper straps, aluminum wires, raised flooring substructure, or in extreme cases, a solid covering of sheet metal. The installation of signal reference grids has been common practice for over 30 years. Most data center designs call out for SRGs and their use and expense are not questioned.
Recently, more and more data centers are being constructed on existing hard-floor environments where SRGs cannot be installed under the floor. The evidence suggests that the lack of SRGs in such installations has given rise to no adverse effects on the operation of the IT equipment. Naturally this leads to the question of why systems can work reliably without an SRG and whether the SRG is ever a necessary or logical...