Transformer

[Djelite]

Hi if the secondary conductors of a seperately derive system/ transformer are considered feeders. What the primary conductors considered

 

[LarryFine]

Hi if the secondary conductors of a seperately derive system/ transformer are considered feeders. What the primary conductors considered

Feeders to the last OCPD, then branch-circuit conductors

 

[Djelite]

Primary conductors not secondary

 

[synchro]

Hi if the secondary conductors of a seperately derive system/ transformer are considered feeders. What the primary conductors considered

They could be feeders from the system that is supplying the transformer, which is a different "system" than the SDS.

 

[Djelite]

Thank you

 

[tom baker]

Transforrmer secondary cond are transtormer secondary, rules just for them.

 

[Djelite]

They are feeders. I’m looking for primary

 

[don_resqcapt19]

Except for the rare case where the OCPD at the supply end of the primary conductors is providing the protection for the primary conductors, the primary winding, the secondary winding, and the secondary conductors, the primary conductor are always feeders.

 

[DrSparks]

Hi if the secondary conductors of a seperately derive system/ transformer are considered feeders. What the primary conductors considered

Feeders

Well not necessarily. Feeders must ultimately terminate line side of an OCPD, e.g. fusible disconnect. This could be on the primary or secondary. But it's still a feeder on both sides. I suppose you could have a transformer on a branch circuit.

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[DrSparks]

An example being, I once installed an electric water heater in a commercial building with 208 wye. I wanted the full wattage output of the water heater so installed a boosting transformer next to the panel to up the voltage to 240. I suppose you would consider the conductors involved branch circuit wires.

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[LarryFine]

Primary conductors not secondary

That's what I was referring to.

 

[LarryFine]

Except for the rare case where the OCPD at the supply end of the primary conductors is providing the protection for the primary conductors, the primary winding, the secondary winding, and the secondary conductors, the primary conductor are always feeders.

Conductors between an OCPD and a primary are not a branch circuit?

 

[DrSparks]

Conductors between an OCPD and a primary are not a branch circuit?

It depends. If the transformer is, say feeding a panelboard then the conductors feeding the primary are a feeder.

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[electrofelon]

Except for the rare case where the OCPD at the supply end of the primary conductors is providing the protection for the primary conductors, the primary winding, the secondary winding, and the secondary conductors, the primary conductor are always feeders.

Since there is no electrical connection between the primary and secondary, couldn't we argue that the primary circuit ends at the primary winding, thus making the circuit feeding the primary a branch circuit regardless of what OCPD's there are after the secondary?

 

[xformer]

Conductors between an OCPD and a primary are not a branch circuit?

IMHO, the real issue here in the definition of a "Branch Circuit". A transformer is not considered a point of utilization load, but a transformer. Hence, Feeders, feed the transformer and feeders feed equipment downstream from a transformer.

 

[Djelite]

Since there is no electrical connection between the primary and secondary, couldn't we argue that the primary circuit ends at the primary winding, thus making the circuit feeding the primary a branch circuit regardless of what OCPD's there are after the secondary?

That’s where I’m going with this