Ceeform 32A OCPD rating?

433.1.1 Ib ≤ In ≤ Iz.

Ib = 31 A so you can, from an overload point of view, have a 40 A MCB (In). But then the cable has to be capable of carrying 40 A (Iz).

That means 6 sqmm instead of 4 sqmm if it's singles in conduit - Table 4D1A RM B.

Chris Pearson: 
 

433.1.1 Ib ≤ In ≤ Iz.

Ib = 31 A so you can, from an overload point of view, have a 40 A MCB (In). But then the cable has to be capable of carrying 40 A (Iz).

That means 6 sqmm instead of 4 sqmm if it's singles in conduit - Table 4D1A RM B.

What about the device that’s plugged in? 
 

These plugs are not fused, so any appliance with a 32A plug can be plugged in with no guarantee of the cable size.  

The socket itself is a blue 32A outlet, so am I OK to protect with a 40A as the socket for this purpose is intended for an appliance that will pull 31A? 

Is there a reason for not using a Mode 3 charger? 

What makes you think that a 32A socket cannot have a 32A breaker, which will take an hour to trip at 40A? Why are you trying to change the intent of BS7671? Your 80% is completely odd, where does it come from?

davezawadi (David Stone): 
 

What makes you think that a 32A socket cannot have a 32A breaker, which will take an hour to trip at 40A? Why are you trying to change the intent of BS7671? Your 80% is completely odd, where does it come from?

The loading of the socket when it is used with the intended appliance will be 31.5A. 

It will be loaded this way for 6+ hours at a time.

Fixed EV charger manuals, state a 40A MCB should be used for this reason. 

In my view loading an MCB to its capacity almost isn’t good design. 

Colin Haggett: 
 

Is there a reason for not using a Mode 3 charger? 

Client has purchased one of these with a Ceeform 32A plug. 

Multiple 16 amp ceeform socket outlets may be protected by a 20 amp OCPD, in order to allow for simultaneous use of one full loading appliance and several small loads.

Larger ceeform outlets should in my view be protected by an OCPD that matches the outlet rating. 

If long term heavy loading is expected, I would consider it good practice to have either a blank space or a minimally loaded MCB each side of the fully loaded one.

I would also consider it good practice to go “one size up” for the cable that supplies the ceeform outlet. Probably 6mm rather than 4mm. This will reduce heating and save energy.

In the USA, the electrical code restricts long term loading of circuits to 80% of the nominal capacity, or put another way requires a circuit capacity of 125% of the design load.

So in the USA, a similar vehicle charger would need a 38 amp circuit, or rounded up to the nearest standard size, a 40 amp circuit.

Or alternatively a 32 amp circuit loaded to only 25.6 amps.

There is no such requirement in the UK.

vantech: 
 

Colin Haggett: 
 

Is there a reason for not using a Mode 3 charger? 

Client has purchased one of these with a Ceeform 32A plug. 

Could be a lot of hassle for you depending on location and earthing arrangements. As to protective device 32amp 

broadgage: 
 

Multiple 16 amp ceeform socket outlets may be protected by a 20 amp OCPD, in order to allow for simultaneous use of one full loading appliance and several small loads.

Larger ceeform outlets should in my view be protected by an OCPD that matches the outlet rating. 

If long term heavy loading is expected, I would consider it good practice to have either a blank space or a minimally loaded MCB each side of the fully loaded one.

I would also consider it good practice to go “one size up” for the cable that supplies the ceeform outlet. Probably 6mm rather than 4mm. This will reduce heating and save energy.

In the USA, the electrical code restricts long term loading of circuits to 80% of the nominal capacity, or put another way requires a circuit capacity of 125% of the design load.

So in the USA, a similar vehicle charger would need a 38 amp circuit, or rounded up to the nearest standard size, a 40 amp circuit.

Or alternatively a 32 amp circuit loaded to only 25.6 amps.

There is no such requirement in the UK.

It’s for a EV so should only have one socket outlet per circuit for Mode 2

Colin Haggett: 
 

broadgage: 
 

Multiple 16 amp ceeform socket outlets may be protected by a 20 amp OCPD, in order to allow for simultaneous use of one full loading appliance and several small loads.

Larger ceeform outlets should in my view be protected by an OCPD that matches the outlet rating. 

If long term heavy loading is expected, I would consider it good practice to have either a blank space or a minimally loaded MCB each side of the fully loaded one.

I would also consider it good practice to go “one size up” for the cable that supplies the ceeform outlet. Probably 6mm rather than 4mm. This will reduce heating and save energy.

In the USA, the electrical code restricts long term loading of circuits to 80% of the nominal capacity, or put another way requires a circuit capacity of 125% of the design load.

So in the USA, a similar vehicle charger would need a 38 amp circuit, or rounded up to the nearest standard size, a 40 amp circuit.

Or alternatively a 32 amp circuit loaded to only 25.6 amps.

There is no such requirement in the UK.

It’s for a EV so should only have one socket outlet per circuit for Mode 2

This device from Ohme is 32A (7.2kw). There are also other ”portable“ devices which and single phase (7.2kW) and three phase (22kW). 

These all have industrial ceeform plugs on them.