taping a tap
- Thread starter grumpy11
- Start date
- Status
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Maybe - we need more details. Size/voltage/phases of transformer, primary/secondary voltage, primary overcurrent device, secondary conductor size, tap sizes and what are they tapped to.
If secondary conductor is sized for primary to secondary ratio and primary overcurrent device, it is not a tap it is a feeder - especially if a two wire secondary or a three wire delta secondary.
I think you mean tapping a tap.
There are no provisions I'm aware of that permit tapping transformer secondary connected conductors.
- Location
- Connecticut
- Occupation
- Engineer
I would have to agree with you. 240.21 says "Conductors supplied under the provisions of 240.21(A) thru (H) shall not supply another conductor except through an OCPD...."
The transformer secondary conductors are supplied under the provisions of 240.21(C).
You could run three different sets of secondary conductors, one to each load, under the provisions of 240.21(C).
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There is a good article at
http://www.iaei.org/magazine/2002/03/feeder-and-transformer-secondary-tap-conductors/
that discusses the issue.
http://www.iaei.org/magazine/2002/03/feeder-and-transformer-secondary-tap-conductors/
that discusses the issue.
buddhakii
Senior Member
- Location
- Littleton, CO
Is there any exception to this rule? I installed temp power for the construction trailers on the job I'm working on right now. I came out of a 480-120/208 transformer into a gutter and mounted pdb's and tapped off of those to 4 disconnects feeding the const. trailers and one construction panel. It was all inspected and passed but for future reference if it is wrong I don't want to take that chance again.
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