https://www.mikeholt.com/download.php?file=PDF/Transformer_Chart.pdf

Apr 10, 2016 ... Load. 2a. Breaker. 4a. Wire. 5a. Raceway. 6. EGC. 2b. Protection. 3. Load. 4b. Wire. 5a. Raceway. 7. SBJ/SSBJ. 3 kVA. 15A. 14 AWG. 1/2.

https://www.mikeholt.com/mojonewsarchive/NEC-HTML/HTML/TransformerInstallation~20020516.htm

The size of the equipment grounding (bonding) conductor for the transformer primary is ... 45 kVA, 70A Primary Protection (Step 2), Table 250.122, 8 AWG ... Where the number of current-carrying conductors in a raceway or cable exceeds  ...

https://www.ecmweb.com/contractor/transformer-installation-made-easysort

Size the equipment grounding (bonding) conductor for the transformer primary based ... 112.5kVA transformer — Per Table 250.122, 175A primary protection ( Step 2) ... Where the number of current-carrying conductors in a raceway or cable  ...

https://sciencing.com/how-8617039-size-overcurrent-device-transformer.html

Aug 7, 2017 ... Circuit breakers protect transformers from overcurrent situations and short circuits . They also protect circuits downstream from the transformer.

https://www.ecmweb.com/nec/small-dry-type-transformers-and-appropriate-ocpd-sizing

Mar 9, 2015 ... How to size small transformer primary side breakers or fuses according to the ... The 2014 Edition of the National Electrical Code (NEC), Table ...

https://www.alfatransformer.com/transformer_calculator.php

NOTE: If you need assistance with circuit protection devices such as fuses or breakers, or wire sizing, please consult a licensed electrical contractor or electrician ...

https://iaeimagazine.org/magazine/2017/08/22/transformer-conductors-and-overcurrent-protection/

Aug 22, 2017 ... This article will focus on overcurrent protection and conductor sizing for ... or rating of 30 A for a circuit breaker or 35 A for fuses (not greater than 36.09 A). .... conductors with ampacity of 390.35 A in accordance with Table 13.

https://www.emerson.com/documents/automation/product-data-sheet-how-to-determine-correct-overcurrent-protection-for-transformers-solahd-en-us-1276316.pdf

“nuisance tripping” – a condition where the breaker trips when energizing the .... current is less than 9 Amps. and secondary fusing is required see chart for size.

https://www.ecmag.com/section/codes-standards/sizing-conductors-part-xxx

Section 450.3 covering overcurrent protection of transformers, and tables ... than delta-delta, three-wire) transformer secondary conductors are not considered to ...

https://jeffersonelectric.com/wp-content/uploads/catalog/basics.pdf

Go to “How to size a transformer” on page 1.3 to determine the proper KVA based ... On the Selection chart find the voltage group heading, 208 V- 480Y/277 – ...