Jpflex
Electrician big leagues
- Location
- Victorville
- Occupation
- Electrician commercial and residential
I know this area can become ambiguous because code requires not only protection of transformers but the conductors.
In 242.1 D (s) outside
Conductors tapped to a transformer secondary may be considered protected without neccesarily having an OCPD at the conductors line side:
If the sum of the overcurrent devices at the conductor termination limits the load to the conductor ampacity.
The overcutrent devices shall consist if not mote tyam 6 circuit brrakers or set of fuses MOUNTED IN A SINGLE ENCLOSURE, group of separate enclosures or in or on a SWITCHBOARD OR SWITCHGEAR.
THERE SHALL BE NO MORE THAN 6 OVERCURRENT DEVICES GROUPED IN ONE LOCATION!!!!
Therefore, if i were to use this transformer secondary tap to terminate into a SINGLE "subpannel" with a single main breaker (series with phase conductors as typical) and more than 6 breakers from the pannel buss to feed branch circuits, then since there are more than 6 breakers within this SINGLE enclosure, how can many projects be compliant as the code is written?
Obviouly 6 loads or OCPD limit wont meet many needs.
I do understand that a power distribution block may be used to feed 6 breakers with an accumulative ampere sum less than or equal to the feeder tap ampacity but how does this code affect situations mentioned above? Thanks
In 242.1 D (s) outside
Conductors tapped to a transformer secondary may be considered protected without neccesarily having an OCPD at the conductors line side:
If the sum of the overcurrent devices at the conductor termination limits the load to the conductor ampacity.
The overcutrent devices shall consist if not mote tyam 6 circuit brrakers or set of fuses MOUNTED IN A SINGLE ENCLOSURE, group of separate enclosures or in or on a SWITCHBOARD OR SWITCHGEAR.
THERE SHALL BE NO MORE THAN 6 OVERCURRENT DEVICES GROUPED IN ONE LOCATION!!!!
Therefore, if i were to use this transformer secondary tap to terminate into a SINGLE "subpannel" with a single main breaker (series with phase conductors as typical) and more than 6 breakers from the pannel buss to feed branch circuits, then since there are more than 6 breakers within this SINGLE enclosure, how can many projects be compliant as the code is written?
Obviouly 6 loads or OCPD limit wont meet many needs.
I do understand that a power distribution block may be used to feed 6 breakers with an accumulative ampere sum less than or equal to the feeder tap ampacity but how does this code affect situations mentioned above? Thanks