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Testing of Signal Reference Grid

Testing of Signal Reference Grid

Testing of Signal Reference Grid

(OP)
Article "Bonding with signal reference grids" EC&M, December 1, 1999 has the following recommendations:
"The AC current on any portion of the SRG should not exceed 250mA. AC current exceeding this level will cause voltages that can affect data signals.

• Measure the equipment-grounding conductor on all AC branch circuits and/or equipment enclosures to verify impedance less than 0.1 ohm. (You should make this measurement with a ground impedance tester.)

• Take two-point bonding measurements between the SRG and all building grounding electrodes. The resistance measurements between any two points should be less than 0.1 ohm."

I looked through IEEE 1100, TIA 942 and other documents and was unable to find the source of the recommeded values. Please help me to locate the appropriate back-up documents.

 

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