An owner has an attic ventillato andf would like me to locate the disconnect switch in the attic space up at the top cord of a truss near the ventillator. This will be approx. 12' above the bottom of the truss. Which is not a problem per exception #2 of 404.8 (A). (As long as the owner can get a step ladder up into the attic to reach that high). Question/concern is, the owner doesn't plan to service the unit from the attic side. instead he will climb up to the roof and reach through the roof to disconnect the unit. Is there a code reference stating he (or I) can install like this knowing how it will be operated?
I'd go with as stated
404.8(A) Exception No. 2 and
Exception No. 3
I don't agree it's correct to Reach through the Roof, this implies a roof hatch of some sorts, once the roof hatch is down there's no direct sight to the disconnect? A line of sight must be maintained!
It just depends is this an industrial ventilators and a roof mounted unit then the disconnect has to be on the roof. It will be serviced from the roof, a means of disconnect has to be on the roof!
If the ventilator is on the vertical wall of the structure than the disconnect is allowed that high per the stated exception.
If a residential vent then the motor serviceability is per the design of the fan but mostly serviced from the ceiling below and not form the roof above. I could be totally wrong here!
I can't get it through my pea brain how they will be reaching in from the roof?
Welcome to the Forum.