Introduction
- The tap changer will be used to regulate the voltage for off circuit distribution transformer,
- The transformer will be filled with oil,
- The tap changer will mounted horizontally under the transformer's cover or at the transformer tank side,
- The control device should be provided with a notch to mark each position and the control knob must be provided with a suitable locking arrangement which can be locked when the tap changer is on a final selected position
- The instruction of tap-changer operation shall be engraved in English language on the control knob,
- All steel parts should be hot dip galvanized,
- The terminals of tap changer must be made of copper.


