Arguments for/against whole house disconnect [RE-wrenches]

[ted r lowe]

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Hi Wrenches,

I'm doing a small gird-tie PV system for a client in a city that has never 
had one before.
The city which runs its own municipal electric utility is putting the 
finishing touches on an PV interconnection
guidelines document and I''ve been asked to comment on the document (due to 
my involvement
in the solar industry and that my client is requiring the document be 
completed soon).

There is one requirement that I am questioning the usefulness of.

An outside lockable AC disconnect for the entire house (ie, 200A) is required
(versus a smaller lockable AC disconnect for just the inverter output).

In my opinion, this seems like overkill, ie, doesn't provide any additional 
safety and would
increase the cost of the system (a little bit).

I'd appreciate your comments on this issue.  Have you seen this requirement 
before elsewhere,
and if so, what was the reasoning behind it (besides 
safetyaholism:-).   I'm hoping to build
a case for removing the requirement from the guidelines so this client and 
possibly many future
systems don't have to spend the money for a piece of equipment that is 
unnecessary.

Thanks,
ted

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