Ground bars are required in all panels (main service panels include ground and neutral). To be sure you are selecting the correct ground bar， divide the number of circuits in the panel by 2 and pick the closest numbered ground bar. For example， a 20 circuit panel would require a GBK10P. The bar offers 1-3/4 in. between mounting holes， has 14 positions and has a length of almost 5-3/4 in.
For use in a 28-circuit load panel
Compatible with all 28-circuit cutler-hammer residential load centers
1-3/4 in. between mounting holes
ANSI certified and UL listed
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