The current rule says that where the generator disconnect is being used as the building disconnect as required by 225.31, then the generator disconnect must be within sight of the building.I think more emphasis needs to be placed on the reasoning for the rule rather than beating up this generator disconnect "Within Sight" rule that keeps coming up time after time that will never seem to be resolved.
Long story short the only reason I can see for the "Within Sight" rule would be for an emergency situation, and even then if you didn't know where to look for it to begin with you'd have to run around the building to try and find it anyway.
Its not like a disconnect for a motor or something like that. "Within Sight of the Building" doesn't make it "Within Sight" of whatever your working on like a motor or air conditioning unit or the like.
If it is for Emergency Shutdown Purpose and the reasoning is to be able to find it quickly the rule should read "Within Sight of the Buildings Service Disconnecting Means".
So what is the reasoning behind having to be able to see the disconnect or even the Enclosure for the disconnect on a generator installation?
If its for servicing purposes, why doesn't the Lockout Capability of the Disconnecting means come into Play?
If its for convienience in case of an emergency, then why is it not "Within Sight of the Service Disconnecting Means" instead of the building in general?
If you don't think that is correct, you have plenty of time to work up a "public input" (formerly known as a "proposal") for the 2020 code. They are due the first Friday of November, 2017.