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Anonymous Poster #1

Portable Home Charger Earthing - EV

01/07/2021 12:45 AM

Here is the Current scenario.

I work for a company which is developing EV .

This EV is a ungrounded EV - IT system

The chassi, the motor and all the conducting parts are isolated only by Basic and Re-inforced insulation.

Now we have a Portable charger whose input is AC and O/P (48VDC) is galvanically separated from the input. The Portable charger is grounded only at the Input.

The Negative DC at the output is not Grounded.

the Charger body is all Plastic and all conducting parts are ensured Re-inforced insulation. No conductive surface. All Metal parts in the charger body is not accessible.

Question - Will this Portable charger require an RCD (Residual Current Device)?

IEC 60364, Part 4: Protection for safety, Section 41: Protection against electric shock

calls for RCD of 30mA before the socket outlet.

as per AIS-138 part-2 standard it is bit unclear.

Quoting AIS-138 Part-2

"To avoid indirect contact in case of failure of the basic and/or fault protection or carelessness by users, additional protection against electric shock shall be required. An RCD (I<30 mA) shall be provided as a part of the EV conductive supply equipment for earthed systems. The RCD shall have a performance at least equal to Type A and be inconformity with standard IEC 60364-4-41.

NOTE: In some countries, other systems of personnel protection are required. Where power supply circuits that are galvanically separated from mains and are galvanically isolated from earth, electrical isolation between the isolated circuits and earth, and between the isolated circuits and exposed conductive parts of vehicle and EVSE shall be monitored. When a fault condition related to the electrical isolation is detected, the power supply circuits shall be automatically de-energized or disconnected by the EVSE"

Any inputs is appreciated.

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#1

Re: Portable Home Charger Earthing - EV

01/07/2021 2:06 AM

Were it to be in the UK, the provisions of British Standard 7671 would apply.

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#2

Re: Portable Home Charger Earthing - EV

01/07/2021 7:38 AM

You should think of it more as, does a potential for lethal current flow exist in any scenario to the user...if that scenario can happen, then you need a protection scheme for the user...You are not only adhering to codes here, you are also addressing liability risk....If the insulation on the charging wire should fail, and a lethal risk exists, then it must have a protection scheme in place....

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