arrow must be black, in accordance with ISO 7010. Each side of the triangle should measure at least 120mm but may be reduced to fit onto small components.
12.5. No HV potential should be exposed anywhere on the Vehicle during normal operation.
12.6. The design of the system must be such to ensure that a single point of failure cannot cause an electric shock hazardous to life.
12.7. HV Electrical cables and electrical equipment must be protected against any risk of mechanical damage( stones, corrosion, mechanical failure, etc.) as well as any risk of fire and electrical shock.
12.8. The voltage class B components and wiring must comply with the applicable sections of IEC 60664 on clearances, creepage distances( 3.4.2) and solid insulation; or meet the withstand voltage capability according to the withstand voltage test given in ISO / DIS 6469-3.2:2010.
12.9. A plug must physically only be able to mate with the correct socket of any sockets within reach. All HV Power Circuit connectors must not have live contacts on either the plug or the receptacle unless they are correctly mated.
12.10. All parts of the electrical equipment must be protected using an appropriate IP class with min IP65 protection on all HV components.
12.11. The HV traction circuit must be isolated from the Vehicle Chassis.
12.12. All HV cabling must comply with LV 216-2, ISO 6722 and ISO 14572 Construction of HV wiring systems for Hybrid and Electric Vehicles. All cables must be orange and shielded, either internally or by conduit and must be securely fixed to the Vehicle chassis using insulated fixings. Tie wraps are not acceptable. Cable conductor material must be copper. The use of aluminium bus bars and terminals is permitted.
12.13. All cable terminals must be crimped, or laser welded with a certificate of conformity if not OEM produced. The use of soldered terminals is prohibited.
12.14. All HV cable runs must be a single contiguous piece of cable between connectors / terminals. Any cable joins or splices must be achieved using bolted terminals securely fixed in a min IP65 rated enclosure with glands / strain relief on the cable entry points. Any covers or access panels must be sealed and secured with fasteners requiring tools to remove.
12.15. Any HV ancillary equipment( contactors, relays, fuses, current shunts etc.) not located in the RESS enclosure( s) must be securely located in a min IP65 rated enclosure with glands / strain relief on the cable entry points. Any covers or access panels must be sealed and secured with fasteners requiring tools to remove.
12.16. All Class B Power Circuit connectors must not have live contacts on either the plug or the receptacle unless they are correctly mated. An automatic HViL( High Voltage Interlock) system must be present in every HV connector and detect if a Power Circuit connector is de-mated, for example with shorter alarm contacts within the same connector and inhibit / remove High Voltage from both the plug and the receptacle. If the connector was live when de-mated, the high voltage must be switched off immediately and any residual voltage on the contacts of both the plug and the receptacle discharged to < 60V DC within 4 seconds. Remating of the connector must not re-energise the circuit.
12.17. All class B Power Circuit connectors and cabling must provide mechanism for locking, strain relief and sealing to the cable assembly.
12.18. All major conductive parts of the body must be connected e. g. with wires of appropriate dimension to obtain equipotential bonding.
12.19. No part of the Chassis or bodywork should be used as a current return path.
12.20. The distribution of high currents in the HV DC network must be made in a star-point configuration and not in a loop, in order to avoid potential shifts resulting from current flows. The star-point of the electrical reference potential is referred to as“ Power Circuit Ground ".
Motorsport UK 2025 National Competition Rules Version 11
Chapter 7 Appendix 11- Electrified Vehicles 285