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EV CHARGING EQUIPMENT

I am hearing from my network of contractors, that have actually read the new 722, that they have been asking charging equipment manufactures for documentary proof to comply with Note 5 of 722.411.4.

They are getting knocked back for asking or in one case a Declaration that says the particular device complies with BS 7671. I think that is wrong to declare that as BS 7671 is an installation safety standard and not a product standard. I believe that as a minimum the equipment must comply with the Low Voltage Directive and be CE marked. I also believe that manufacturers have to issue a Declaration of Conformity.

BS 7671 722 has numerous references to the various standards required such as BS EN 61851 that the equipment must comply with. I am thinking it may be illegal to offer the sale of equipment that does not comply with the Low Voltage Directive and is not CE marked?

I am hoping the countries top man of equipment safety standards, Paul Skyrme , sees this post and will come on and give us his expert view?

Has any forum member asked for a Declaration of Conformity from EV charging equipment manufacturers and received one?

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0 OlympusMons over 4 years ago

gkenyon:

davezawadi:

Yes Andy, but that will put the short circuit ability (which may be an amp if its a good battery) through the RCD and we are working on milli-amps of DC! A 1k resistor also in the battery circuit will give 9mA etc.

Agreed - that's effectively what we have with EV charging equipment pilot, but the source is 12 V not 9 V.

How much is shared with the Neutral depends on the resistances of the conductors upstream back to the point of common coupling.

Therefore in a TT system, the risk is less than a TN system, and TN-S lower DC current is likely to be shared than in a TN-C-S (PME) installation.

Hi Graham. I thought I would share the reply I got from Mitsubishi regarding the "granny lead" that came with the car which I mentioned earlier in this thread;

Good morning,

Here’s a brief explanation of what the CCID box does and how it controls the charging. We have no information as to what type of RCD is fitted to the CCID.

The box on the cable is not the charger, it is a control and interruption device that switches the current to the on board charger (OBC) which is mounted in the car, on and off. The CCID initially outputs a 12VDC supply via a switch onto pin 3 of the EVSE (Electric Vehicle Supply Equipment) Connector whenever the charge lead is plugged in to a 240VAC power supply. This indicates the EVSE is ready, but not connected to a vehicle.

When the EVSE connector is connected to a vehicle, a resistor in the OBC pulls the voltage on pin 3 down to 9V. This indicates to the CCID that it is connected to a vehicle. At this point, the CCID activates a switch to start sending the PWM Pilot signal out on Pin 3. The pilot signal tells the OBC how much current it can draw. In the UK this will be 10A.

Once the OBC registers the Pilot signal, it switches on another switch. This connects a resistor into the circuit which pulls the voltage down to 6V. This tells the CCID to commence charging and the CCID will then switch on the RCD to allow mains supply to the charge lead.

When the battery has reached full charge the OBC will turn off the relevant switches which puts the pilot signal back up to 9v which tells the CCID to switch off the RCD.

I hope this helps.

Kind regards,

We have no information about the RCD in the CCID, but if it is double pole, then from the above the neutral would only be connected when 6V were showing in the DC circuit. Regardless of whether the RCD was DP or not, the whole of the time the vehicle is charging, only 6V would be on the circuit.
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0 OlympusMons over 4 years ago

gkenyon:

davezawadi:

Yes Andy, but that will put the short circuit ability (which may be an amp if its a good battery) through the RCD and we are working on milli-amps of DC! A 1k resistor also in the battery circuit will give 9mA etc.

Agreed - that's effectively what we have with EV charging equipment pilot, but the source is 12 V not 9 V.

How much is shared with the Neutral depends on the resistances of the conductors upstream back to the point of common coupling.

Therefore in a TT system, the risk is less than a TN system, and TN-S lower DC current is likely to be shared than in a TN-C-S (PME) installation.

Hi Graham. I thought I would share the reply I got from Mitsubishi regarding the "granny lead" that came with the car which I mentioned earlier in this thread;

Good morning,

Here’s a brief explanation of what the CCID box does and how it controls the charging. We have no information as to what type of RCD is fitted to the CCID.

The box on the cable is not the charger, it is a control and interruption device that switches the current to the on board charger (OBC) which is mounted in the car, on and off. The CCID initially outputs a 12VDC supply via a switch onto pin 3 of the EVSE (Electric Vehicle Supply Equipment) Connector whenever the charge lead is plugged in to a 240VAC power supply. This indicates the EVSE is ready, but not connected to a vehicle.

When the EVSE connector is connected to a vehicle, a resistor in the OBC pulls the voltage on pin 3 down to 9V. This indicates to the CCID that it is connected to a vehicle. At this point, the CCID activates a switch to start sending the PWM Pilot signal out on Pin 3. The pilot signal tells the OBC how much current it can draw. In the UK this will be 10A.

Once the OBC registers the Pilot signal, it switches on another switch. This connects a resistor into the circuit which pulls the voltage down to 6V. This tells the CCID to commence charging and the CCID will then switch on the RCD to allow mains supply to the charge lead.

When the battery has reached full charge the OBC will turn off the relevant switches which puts the pilot signal back up to 9v which tells the CCID to switch off the RCD.

I hope this helps.

Kind regards,

We have no information about the RCD in the CCID, but if it is double pole, then from the above the neutral would only be connected when 6V were showing in the DC circuit. Regardless of whether the RCD was DP or not, the whole of the time the vehicle is charging, only 6V would be on the circuit.
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EV CHARGING EQUIPMENT

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