BS EN IEC 61851-25:2021

What is BS EN IEC 61851‑25 about?  

BS EN IEC 61851‑25 provides the requirements for the DC EV supply equipment where the secondary circuit is protected from the primary circuit by electrical separation. 

BS EN IEC 61851‑25 applies to the DC EV supply equipment for charging electric road vehicles with a rated supply voltage of up to 480 V AC or up to 600 V DC, with rated output voltage not exceeding 120 V DC and output currents not exceeding 100 A DC. 

BS EN IEC 61851‑25 provides the requirements for the control and the communication between DC EV supply equipment and an EV.  

BS EN IEC 61851‑25 also applies to DC EV supply equipment supplied from on-site storage systems. 

The aspects covered in BS EN IEC 61851‑25 include: 

• Characteristics and operating conditions of the DC EV supply equipment 
• Specification of the connection between the DC EV supply equipment and the EV 
• Requirements for electrical safety for the DC EV supply equipment 

NOTE- 

BS EN IEC 61851‑25 does not apply to: 

• Safety aspects related to maintenance 
• Charging of trolley buses, rail vehicles, industrial trucks and vehicles designed primarily for use off-road 
• Equipment on the ev 
• Emc requirements for equipment on the ev while connected, which are covered in iec 61851-21-1 
• Charging the RESS off-board the EV. 

Requirements for bi-directional power flow are not covered in BS EN IEC 61851‑25.  

Who is BS EN IEC 61851‑25 for? 

BS EN IEC 61851‑25 on electric vehicle conductive charging system is applicable to: 

• Electric vehicle manufacturers  
• Electric vehicle charger manufacturers 
• Electric vehicle charging stations 
• Vehicle regulatory authorities  

Why should you use BS EN IEC 61851‑25?  

While charging there should be communication between the charger and the EV so that the energy is not wasted. BS EN IEC 61851‑25 establishes digital communication between the EV and the DC EV supply equipment to validate and control the energy transfer. This will help you in reducing energy wastage while charging. 

In case of an emergency, BS EN IEC 61851‑25 gives three shut down procedures to stop energy transfer from DC EV supply equipment to the EV. 

The charging process of an EV involves a massive amount of power transfer so any contact with a live part will be hazardous. BS EN IEC 61851‑25 provides measures for degrees of protection against access to hazardous-live parts. 

BS EN IEC 61851‑25 lays out safety requirements for signalling circuits between the EV supply equipment and the EV.