A Safety Advisory/ Standard Operating Procedures (SOPs) for Electric Vehicle (EV) Charging Stations across Maharashtra was recently issued by the Office of the Chief Electrical Inspector Mr Dinesh Khonde, Industries, Energy and Labour Department, Maharashtra. These have been issued for EV charging stations in multi-storey buildings, including residential, commercial premises, hotels, hospitals, car parks, malls, and places for public gathering for two, three and four-wheeler vehicles throughout the state of Maharashtra.
Electrical Safety Provisions related to charging stations:
- Each EV charging installation shall have sufficient sanction load to accommodate house load along with EV charging in addition to it. Adequate measures shall be observed to mitigate the load requirements for EV charging by the owner. Also, augmentation of the wiring and cabling along with a protection system must be carried out.
- Each electric vehicle charging points shall be supplied individually by a dedicated final sub-circuit protected by an overcurrent protective device such as MCB complying with IS/ IEC60947-2, IS/IEC60947-6-2 or the IS/IEC60269 series and the overcurrent protective device shall be part of a switchboard.
- All electric vehicles charging stations shall be provided with protection against the overload input supply and output supply fittings.
- Suitable lightning protection system shall be provided for the electric vehicles charging stations as per Indian Standards Code IS/ IEC 62305.
- The electric vehicle charging station shall be equipped with a protective device against the uncontrolled reverse power flow from the vehicle.
- If in case EV Charging station is being used for public charging purpose an emergency push button shall be provided at the power incomer side for disconnection of power supply to public EV charging station.
- Three phases Electrical Vehicle Supply Equipment (EVSE) shall be equally loaded in all phases.
- All residual current device for the protection of supplies for electric vehicle shall,
(a) Have a residual operating current of not greater than 30 mA.
(b) interrupt all live conductors, including the neutral; and
(c) Have a performance at least equal to Type A and be in conformity with IS732
- Where required for service reasons, discrimination (selectivity) shall be maintained between the residual current device/miniature circuit breaker of suitable type protecting a connecting point and installed upstream.
- A Surge Protective Device (SPD) shall be installed upstream of residual current device to limit transient over voltages due to lightning or switching.
- All electric vehicle charging stations shall be provided with an earth continuity monitoring system that disconnects the supply if the earthing connection to the vehicle becomes ineffective.
- Earthing of all electric vehicle charging stations shall be as per IS 732.
- The cable may be fitted with an earth-connected metal shielding and the cable insulation shall be wear resistant and maintain flexibility over the full temperature range.
- No flammable or combustible material, other than those which form parts of the vehicle and their associated chargers, should be stored within the designated charging area.
- Enclosure for charging stations shall be made of fire-retardant material with self-extinguishing property and free from halogen.
- Fire Detection, alarm and control system shall be as per relevant Indian Standards.
- The power cables/wires laid for EV charger(s) shall not be taken along other service pipes, gas lines and fire exit paths.
- Power supply cables used in charging stations or charging points shall conform to IEC 62893-1 and 17505(Part-1) (Standard for Fire Survival Cables) and its relevant parts.
The Installation shall conform to the following Act, Rules, and Regulations & Standards:
- Electric Vehicle (EV) policy Maharashtra 2021.
- The relevant provisions of the Central Electricity Authority (Measures Relating to Safety and Electric Supply) Regulations, 2010 and The Electricity Act, 2003.
- Central Electricity Authority (Measures Relating to Safety and Electric Supply) Amendment Regulations, 2019.
- Central Electricity Authority (Technical Standards for connectivity of the Distributed Generating Resources) Amendment Regulations, 2019.
- Ministry of Power, Government of India revised guidelines & standards order N,12/2/2018-EV (Comp No. 244347) dated 14/01/2022.
- IS 17017 Series of Standards & IS/ISO 15118.
- Various orders/circulars related to EV charging stations published by CEI Maharashtra government.