Isolation Switch for three-phase power beyond 100A

[Boba]

Hi all,

I live in a property that is 100% electric so our potential demand is pretty high.  Add to that, we are building an guest house with its own supply requirements and dropping in two car chargers as part of renovations.

We have a three-phase supply to the property so I was planning on using a phase each for the mainhouse, gueshouse and chargers.

Recently we had a poly-phase meter installed by the electricity board butat the same time I think they have installed an isolator switch that seems to have a 100A TOTAL load across all three phases (see attached photo).

I can't find any documentation that makes if this is the case (I don't understand how it could measure the load across all three phases?)

So my question is this:

Is this 100A per phase/channel or across all phases?

If its in total, does anyone have any recommendations for what can be installed to be able to use more of the 220A available (based on the fuses for the supply.

 

Thanks for any and all help!

[garrymartin]

It's 100A per phase.

 

I'm more interested in why one of the phases has a 60A fuse and the other two have 80A fuses?? Were you given a reason, or have you requested it for some reason?

Edited August 4 by garrymartin

[markc]

As above, it’s not 100A total load, 100A each phase, I think it’s still 80A fuse, just not clearly written.

fast car chargers need 3 phase supplies but wont be at full load all the time so shouldn’t be a problem

[Gone West]

1 hour ago, markc said:

I think it’s still 80A fuse, just not clearly written

 

Looks like 60A, which is odd. Do they put stickers on the other isolator switches, showing maximum amps, when the other phases are connected up.

[Boba]

10 hours ago, garrymartin said:

It's 100A per phase.

 

I'm more interested in why one of the phases has a 60A fuse and the other two have 80A fuses?? Were you given a reason, or have you requested it for some reason?

Thanks for the help Garry!  No not requested those fuses - I'm pretty sure its just what was there before.  Should be sufficient for what we need!

 

1 hour ago, markc said:

As above, it’s not 100A total load, 100A each phase, I think it’s still 80A fuse, just not clearly written.

fast car chargers need 3 phase supplies but wont be at full load all the time so shouldn’t be a problem

Thanks Mark, much appreciated!  Yeah we're not going for fast chargers - just two standard chargers (I think they draw a max of 7kw each)

 

9 minutes ago, Gone West said:

 

Looks like 60A, which is odd. Do they put stickers on the other isolator switches, showing maximum amps, when the other phases are connected up.

Thanks for the comment Gone West - I doubt it as they've doen their bit, its our sparky that will run the tails from the isolator to the other consumer boards.