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NJ Electrical Contractor
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Discussion Starter · #1 · (Edited)
I have a job where i need to apply feeder tap rule, Rule only covers 10ft and 25ft but then it is unlimited if its outside, Can i apply this rule if my run is 75ft in distance, the unlimited rule does not apply i think because my feeder is located at an indoor garage, can someone shed some light regarding taps.

My scenario is as follow:

I have a 200A service disconnect at the electrical room located inside an apartment complex, the disconnect feeds a 200A distribution panel located on the 7th floor penthouse, I need to install a 60 or 80A electrical vehicle charger located about 75ft away from my service disconnect located on the same floor where the vehicle is parked, My idea was to tap the feeders on the load side of the disconnect within a trough/enclosure and branch out to my vehicle charger.

Some one please correct me if my theory is wrong.






Feeder tap rules.

There are five rules regarding feeder taps, but the most common include the 10-ft tap, the 25-ft tap, and the outside feeder tap.
10-ft feeder tap rule [240.21(B)(1)] — You don't have to install an OCPD at the tap point of a feeder tap if its length doesn't exceed 10 ft and if it meets the following requirements (Fig. 1 above):

  • The ampacity of the tap conductor is not less than the computed load in accordance with Art. 220, and not less than the rating of the device supplied by the tap conductors or the OCPD at the termination of the tap conductors.
  • The tap conductors aren't extended beyond the equipment they supply.
  • The tap conductors are installed in a raceway if they leave the enclosure.
  • The tap conductors have an ampacity of no less than 10% of the ampacity of the OCPD from which the conductors are tapped.
25-ft feeder tap rule [240.21(B)(2)] — You don't have to install an OCPD at the tap point of a feeder tap if its length doesn't exceed 25 ft and if it meets the following requirements:

  • The ampacity of the tap conductors is not less than ⅓ the ampacity of the OCPD protecting the feeder.
  • The tap conductors are terminated in a single circuit breaker or set of fuses having a rating no greater than the conductor ampacity as listed in Table 310.16.
  • The tap conductors are suitably protected from physical damage or enclosed in a raceway.
Outside feeder tap of unlimited length rule [240.21(B)(5)] — You don't have to install an OCPD at the tap point of a feeder tap of unlimited length as long as you meet the following requirements (Fig. 2 below):
 

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NJ Electrical Contractor
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324 Posts
Discussion Starter · #4 ·
Should be fine as long as you put a fused disconnect within 25' of the tap. I'm assuming you are running a 100a circuit.
Ideally I want to run a 100A circuit but I don't want to exceed my tap amperage rating of 200a so I want to safely say between 60 and 80a.

So in other words I can have a run of 75 feet just as long I install a fused disconnect at 25th mark?
 

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That is correct.

Why run the whole 25 foot ? Make it closer if you have the room
 
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