Boost Transformer

[steve66]

Sanity check:

Two boost transformers - 208V, 3 phase input and 230V, 3 phase output) would require overcurrent protection on both the primary and the secondary, correct?

This is a branch circuit supplying a receptacle for lab equipment.

 

[david luchini]

Sanity check:

Two boost transformers - 208V, 3 phase input and 230V, 3 phase output) would require overcurrent protection on both the primary and the secondary, correct?

This is a branch circuit supplying a receptacle for lab equipment.

Both the primary and secondary conductors would require overcurrent protection.

 

[winnie]

Two separate 3 phase transformers or two _single_ phase transformers used to boost three phase 208V in an 'open delta' configuration?

Both primary and secondary conductors require overcurrent protection, but some transformer configurations permit the primary OCPD to also protect the secondary conductors. I believe that this applies to single phase buck-boost transformers, and may apply to the open delta pair of buck-boost transformers. However I'm not strongly positive on this point so double check.

Jon

 

[petersonra]

Two separate 3 phase transformers or two _single_ phase transformers used to boost three phase 208V in an 'open delta' configuration?

Both primary and secondary conductors require overcurrent protection, but some transformer configurations permit the primary OCPD to also protect the secondary conductors. I believe that this applies to single phase buck-boost transformers, and may apply to the open delta pair of buck-boost transformers. However I'm not strongly positive on this point so double check.

Jon

Iirc, only allowed if you have 3 phase ungrounded delta or 2 wire single phase.