david
Senior Member
- Location
- Pennsylvania
In PA you do not have to be a licencee electrician and electrical inspectors do not trace out during a rough wire inspection each branch circuit from load to supply.
lets look at the real life application
These three situations are real and the building department did not approve additional supplies based on the precept it is just more expedient .
(1)A tanning Solon moves into a building that has 200 amp overhead service. Starting out with a few beds. The customer base grows and soon more beds are going to be needed to provide for the growth in clients’
submit a permit application to add a second 200 amp service to the building because that is less costly and for no other reason more easy for the owner. The building department says no only one service to the building you need to increase the size of the service to 400 amp, instead of adding a second 200 amp service.
just take the cheaper option through the loop hole you may have found in the NEC
add a 200 amp service on a pole or pedestal in front of this tanning salon and run a 200 amp feed into the building to provide for the additional load.
(2) a landlord starts buying a lot of single family dwellings to turn them into rentals. The landlord decides he can double his profits by just adding a second service to these single family dwellings and rent the second half to another family.
The electrical inspector shows up at the first property he attempt to do this at and is told you cannot just add a second service to an existing single family dwelling.
He also uses the loop whole in the NEC by placing a pole or pedestal service in the front of this single family dwelling.
This landlord now sneaks under the radar of a building inspectors attention and gets his second supply and avoids any fire separation he may have been required to provide
(3) New construction of a single family dwelling with a garage in the back lot with its own service,
The new dwelling is provided with a 200 amp service in the front and a feeder from the garage to a distribution panel in the back.
The bathrooms and kitchens and laundry face the back of the dwelling so all the loads in the rear of the house are taken from the garage service through a feeder to the basement all the rest of the loads are taken from the dwelling service in the front
The next paragraph indicating different utility transformers as the supply would have only been an issue for one of the above.
It just happens the service and feeder originate from the utility at two different transformer locations
and what the NEC is advocating begins to be done in many different ways throughout the country
in the confusion of all this branch circuits from one supply in the same junction as branch circuits from the other supply get mixed together
the ones this happens to that are on the same line, say line one of the utility this does not become apparent until there is an outage on one of the utility transformers but not the other utility transformer providing a supply through a feeder.
Once branch circuits or feeder( less likely) get mixed together the utility is back feed
lets look at the real life application
These three situations are real and the building department did not approve additional supplies based on the precept it is just more expedient .
(1)A tanning Solon moves into a building that has 200 amp overhead service. Starting out with a few beds. The customer base grows and soon more beds are going to be needed to provide for the growth in clients’
submit a permit application to add a second 200 amp service to the building because that is less costly and for no other reason more easy for the owner. The building department says no only one service to the building you need to increase the size of the service to 400 amp, instead of adding a second 200 amp service.
just take the cheaper option through the loop hole you may have found in the NEC
add a 200 amp service on a pole or pedestal in front of this tanning salon and run a 200 amp feed into the building to provide for the additional load.
(2) a landlord starts buying a lot of single family dwellings to turn them into rentals. The landlord decides he can double his profits by just adding a second service to these single family dwellings and rent the second half to another family.
The electrical inspector shows up at the first property he attempt to do this at and is told you cannot just add a second service to an existing single family dwelling.
He also uses the loop whole in the NEC by placing a pole or pedestal service in the front of this single family dwelling.
This landlord now sneaks under the radar of a building inspectors attention and gets his second supply and avoids any fire separation he may have been required to provide
(3) New construction of a single family dwelling with a garage in the back lot with its own service,
The new dwelling is provided with a 200 amp service in the front and a feeder from the garage to a distribution panel in the back.
The bathrooms and kitchens and laundry face the back of the dwelling so all the loads in the rear of the house are taken from the garage service through a feeder to the basement all the rest of the loads are taken from the dwelling service in the front
The next paragraph indicating different utility transformers as the supply would have only been an issue for one of the above.
It just happens the service and feeder originate from the utility at two different transformer locations
and what the NEC is advocating begins to be done in many different ways throughout the country
in the confusion of all this branch circuits from one supply in the same junction as branch circuits from the other supply get mixed together
the ones this happens to that are on the same line, say line one of the utility this does not become apparent until there is an outage on one of the utility transformers but not the other utility transformer providing a supply through a feeder.
Once branch circuits or feeder( less likely) get mixed together the utility is back feed