malachi constant
Senior Member
- Location
- Minneapolis
This is surely a simple question for many of you, but I don't venture often into the world of taps and want to make sure nothing is illegal here.
Existing installation, a long (hundreds of feet) 300A feeder is protected at its source by a 300A fuse. The feeder terminates in a gutter, which taps off into several smaller disconnects located immediately below the gutter. I think they are 3x 100A and 2x 30A disconnects, feeding HVAC equipment.
Our project proposes to demolish the 3x 100A disconnects, leaving the smaller 2x 30A disconnects in place. (They will be demolished a year or two later, at which point the 300A feeder will be repurposed for something else.)
Prior to looking into the code I had held some vague notion that if we are taking load off the gutter, that those were part of some ratio equation that directly affected the remaining taps. However having read up on the 240.21 tap rules I now understand they are written so as to have proper overcurrent protection within so many feet of a tap. Having figure that out I think this modification is legal, as the loss of the larger taps has no bearing on whether or not the smaller taps are legal.
If anyone can confirm that it is appreciated. I don't feel like I've explained this install (or at least my concerns) very well so feel free to ask questions. Thanks!
Existing installation, a long (hundreds of feet) 300A feeder is protected at its source by a 300A fuse. The feeder terminates in a gutter, which taps off into several smaller disconnects located immediately below the gutter. I think they are 3x 100A and 2x 30A disconnects, feeding HVAC equipment.
Our project proposes to demolish the 3x 100A disconnects, leaving the smaller 2x 30A disconnects in place. (They will be demolished a year or two later, at which point the 300A feeder will be repurposed for something else.)
Prior to looking into the code I had held some vague notion that if we are taking load off the gutter, that those were part of some ratio equation that directly affected the remaining taps. However having read up on the 240.21 tap rules I now understand they are written so as to have proper overcurrent protection within so many feet of a tap. Having figure that out I think this modification is legal, as the loss of the larger taps has no bearing on whether or not the smaller taps are legal.
If anyone can confirm that it is appreciated. I don't feel like I've explained this install (or at least my concerns) very well so feel free to ask questions. Thanks!
