Module grounding [RE-wrenches]

[graham at solarexpert.com]

Wrenches,

I am trying to figure out the best way to ground each module frame 
easily when MC’s are used and the modules are secured with module 
clamps?  I am used to panelizing modules into groups of 4 with wiring 
and grounding done in shop.  Next we would secure the panels of 4 side 
by side on gold galv strut.  Installing modules one by one eliminates a 
day in the shop and sounds very quick and easy, but I am still trying to 
figure out the easy grounding method.  I know that drilling a hole or 
putting a tek screw into a module frame voids warranties but is it 
acceptable to take out a module frame screw and replace it with the 
grounding-cup-washer that comes with Siemens modules and a slightly 
longer stainless steel screw?

LADWP had required grounding of each individual module, but I have heard 
that just grounding the frame is passable in other municipalities.  I 
would rather ground each module.

Graham Owen
GO Solar Company

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