Using grounding clips

The Unirac Code Compliant Installation Manual, on Page 25, shows that you should use two grounding clips between modules, at every other space between modules. Ironridge recommends that you specify one grounding clip for every two mid-clamps.

I'm curious why we can't use only one grounding clip for every four mid-clamps. This would allow us to ground two modules to one rail, then use grounding lugs to take the ground from rail to rail.

Do these manufacturers suggest you use an extra grounding clip for redundancy, or is there an actual electrical need to double up the clips?

Thanks for all your help!

Comments

Thanks for your question - this is fairly straightforward.Ignore the number of clamps, and use 'pairs of modules' as your guide. For both Unirac and Ironridge, the WEEB manufacturer, Wiley, requires 2 clips per pair of modules and 2 additional for an extra or odd number of modules.
The reason for this is that the AWG equivalent of one WEEB penetration is wire gauge 12, which is too small for a UL compliant ground. 2 WEEB penetrations are equivalent to gauge (AWG) 6, which is equal to or greater than the required gauge 8.

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