Hi Phil,
Four out of the six of utilities that we deal with here in Arizona require an external AC disconnect, and yes, we do install the plaque. About half of the utilities explicitly require it, the other half don't. I agree that is a confusing label, possibly leading service personnel to believe a mostly non-existent danger exists. Then again, what do the laws of physics and probabilities have to do with interconnection issues?
Best, Louis Woofenden The Solar Store Tucson, AZ
Our utilities require an external AC disconnect between the inverter and the point of interconnection, located next to the meter. In the past, we have marked this switch with the language in 690.17 (although no AHJ or utility has required it). Because we generally argue against the necessity of this switch, I don't feel it is accurate to say that "terminals on both the line AND load sides may be energized in the open position"...
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