Ans: Miscellaneous equipment at control post or switching substations & functions:
1. Lightening arrestor: protection against voltage surges
2. Auxiliary transformer: provides 230 V, 50 Hz, supply to operate battery charger, remote control equipment, signally and lighting.
3. PT: provides continuous indication regarding the condition of supply.
4. Battery: for operation of remote control equipment and interrupter.
5. Battery charging equipment: charge batteries at the control post.