Transformer


According to NEC 2008 section 70-336. Transformer Field-connected as an Autotransformer shall be identified for use at elevated voltage.

Grounding XFMRs:
Grounded systems for the purpose of creating a 3 phase, 4 wire distribution system or providing a neutral point for grounding purposes.
The XFMR shall be directly connected to the ungrounded phase conductors and shall not be switched or provided with over current protection that is independent of the main switch and common-trip over-current protection for the 3 phase,4wire system.

AC-Transformer is a device comprising two or more electric circuits coupled by a common magnetic circuits. It consists of two coils, the primary, and the secondary.

In practice, it's important to choose the right XFMR that fit your application.
I provide a few information we have to gather before selecting a XFMR and where to get those info:

  • Nominal primary voltage. (Can be known from one line diagram).

  • Nominal secondary voltage. (Voltage source to feed equipments).

  • Power KVA rating or load current rating.

  • Number of phase on power source: single phase or three phase.

  • Determine enclosure type. (Based upon area of classification)








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