Discuss Upgrade Consumer Unit in Garage with EV Charger Capability. in the Electrical Forum area at ElectriciansForums.net

RDB85

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I’m looking to get my consumer unit upgraded in my Garage as it’s an old Chint board that is not very good..

My Dad is looking at EV Chargers too and I was wondering if it’s possible to get a consumer unit that would handle that. The current board has MCBs for

6A - Lighting
16A Electric Fire
32A for Sockets

I’m also in the process of renewing a cable that was cut by the builders to feed my Shed which has a single socket an LED Baton light and FCU. So it’s needs an MCB for that too.
 
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RDB85

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What is the board fed from? (MCB rating, cable size and type etc.). And what earthing system?

The board is fed from the main CCU in the house. It’s on a 40a mcb with a 10mm T&E it was the only cable that I available. The earthing system is a TNC-S
 

timhoward

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The board is fed from the main CCU in the house. It’s on a 40a mcb with a 10mm T&E it was the only cable that I available. The earthing system is a TNC-S
Two more questions:
Which installation method from table 4D5 would you say the current 10 sq mm T+E is?
Is the 10 sq mm T+E installed in such as way as to not require RCD protection?

It would be preferable to split the meter tails and use a fused switch at the house so as to be sure the MCB's at the garage can trip under fault conditions without the upstream B40 tripping. At the moment either or both could trip.

Subject to your answers being "clipped direct" and "yes" respectively there's at least three ways I can see of proceeding:
-the easy but dodgy way, change to a B50 in the house so the design current of the circuit is well in excess of the max demand when the EVCP is in use. Dodgy because you still don't have selectivity.
-the cunning way, leave the distribution circuit alone and use an EVCP system with a 2nd CT clamp to throttle charging if the garage demand exceeds 40A. For example if the electric fire is on and there's a heavy load on the RFC the EVCP could be set to throttle itself to keep the total garage demand under 40A
-the right way, change to a fused supply

You'll also need to check for a looped supply at the house and find out the supplier fuse size. Most of the time there will need to be a CT clamp at the origin to throttle charging to a grid limit of 60A. Some systems have wireless CT options. e.g. Zappi

For the board change I'd suggest Fusebox with double pole compact RCBOs.
 

telectrix

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Two more questions:
Which installation method from table 4D5 would you say the current 10 sq mm T+E is?
Is the 10 sq mm T+E installed in such as way as to not require RCD protection?

It would be preferable to split the meter tails and use a fused switch at the house so as to be sure the MCB's at the garage can trip under fault conditions without the upstream B40 tripping. At the moment either or both could trip.

Subject to your answers being "clipped direct" and "yes" respectively there's at least three ways I can see of proceeding:
-the easy but dodgy way, change to a B50 in the house so the design current of the circuit is well in excess of the max demand when the EVCP is in use. Dodgy because you still don't have selectivity.
-the cunning way, leave the distribution circuit alone and use an EVCP system with a 2nd CT clamp to throttle charging if the garage demand exceeds 40A. For example if the electric fire is on and there's a heavy load on the RFC the EVCP could be set to throttle itself to keep the total garage demand under 40A
-the right way, change to a fused supply

You'll also need to check for a looped supply at the house and find out the supplier fuse size. Most of the time there will need to be a CT clamp at the origin to throttle charging to a grid limit of 60A. Some systems have wireless CT options. e.g. Zappi

For the board change I'd suggest Fusebox with double pole compact RCBOs.
if this would be on a farm. it'd be a2.5mm cable protected by a 6" nail . worked for 40 years, why spend?
 

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