Electrical design for EV charging supply

Electrical design for Electric Vehicle charging design: BS 7671: 2018

We design the electrical supply for the installation of equipment for EV charging stations for commercial, industrial, and domestic use.

  • Load profiling analysis of existing building/property to ensure capacity considering installation maximum demand, and identify options for load balancing for single or multiple charging points.

  • Review and confirm earthing systems.

  • As-built design capture of proposed building/property in Amtech Electrical Design Software to validate the existing installation and charging provision proposed to be included in the electrical distribution within the building/property.

  • Pre-installation review and guidance with best practices, compliance with regulations and suitability of Distribution Network Operator (DNO) equipment.

  • Identification and specification of modes of charging Mode 1, 2, 3, & 4 with consideration for AC or DC charging.

    • Mode 1 = Household socket charging only, single phase domestic socket outlet, 16A/250v limitation, extension cord on Earthed installation with earth leakage protection (Note: no longer used in the developing technology)

    • Mode 2 = Domestic charging only, single or 3 phase domestic socket outlet, 32A/250v single phase or 480v phase limitation, cable with a protective device on Personal Protection (PP) via the In Cable Control Box (ICCB) with incorporated RCD.

    • Mode 3 = Commercial and Industrial charging, single or 3 phase, supply to charging either wall mounted pods or floor mounted posts rated to 10A, 16A or 32A/250v single phase or 380v 3 Phase limitation, utilizing dedicated socket outlets type 2 or tethered cables.

    • Mode 4 = Commercial and Industrial charging, single or 3 phase, supply to charging either wall mounted pods or floor mounted posts rated to 10A, 16A, 32A/250v single phase or 480v 3 Phase limitation, utilizing dedicated Combined Charging System (CCS) & CHADeMo tethered outlets. AC is converted to DC within the Electric Vehicle Service Equipment (EVSE)

  • Review of expected vehicle types to ensure electrical and physical compatibility between the proposed charging station and receiving vehicle/s.

  • Guidance on practical measures to consider for the installation environment. Onsite assessment suggesting measures to mitigate simultaneous contact due to separated earthing measures and protection against mechanical damage due to proximity of moving and parked vehicles.