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Ian1981
Why not put a clamp meter on the tails (each one at different times) and see what load it's pulling?
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itsonly3wires
@Ian1981 swimming pool pumps, sauna, spa air pump are high demand (for a residential install) and they are normally in use simultaneously. Then add in an electric hob, and oven and we are starting to pull close to 80amps.
I'm lazy with my demand calculations... but I suspect that the demand is higher than 125Amps. I can see 40 Amps in the swimming pool plant room. There are 2 kitchens and 3 american fridges. Air conditioning and a 16Amp inverter for motor drive in a workshop.
I'm lazy with my demand calculations... but I suspect that the demand is higher than 125Amps. I can see 40 Amps in the swimming pool plant room. There are 2 kitchens and 3 american fridges. Air conditioning and a 16Amp inverter for motor drive in a workshop.
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Ian1981
I here what you are saying and you maybe right.
Is there evidence of thermal damage anywhere, particularly the protective fuses supplying the installation, are they hot to touch ,including the main switch at the dist board?
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itsonly3wires
@Ian1981 I have...
If I sum L1,L2 and L3 (which is actually all L1 because it is not 3 phase) then I arrive at around 28 Amps and that is a "quiescent" current... there was no one home. That is all just fridges and pool filtration.
I obviously can then see that 28Amps (all of it) on the neutral. Because the current is all flowing through that conductor.
So I can see the building demand being in excess of 125A and that is fine when you consider the line conductors and the 125A x 3 switching of the line conductors.... but there is a 125A switch in the neutral and it all goes through that one pole.
If I sum L1,L2 and L3 (which is actually all L1 because it is not 3 phase) then I arrive at around 28 Amps and that is a "quiescent" current... there was no one home. That is all just fridges and pool filtration.
I obviously can then see that 28Amps (all of it) on the neutral. Because the current is all flowing through that conductor.
So I can see the building demand being in excess of 125A and that is fine when you consider the line conductors and the 125A x 3 switching of the line conductors.... but there is a 125A switch in the neutral and it all goes through that one pole.
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Ian1981
Fair enough you are the inspector.
Looks like they will require 2 or 3 phase
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Ian1981
I would honestly do a load check with a clamp meter.
You could always advise that the installation may need upgrading in terms of loading but if it's been functioning for years as it is then it maybe adequate.
No heat damage anywhere especially the main switch and cut out fuse plus terminals may indicate that it's not being overloaded. just a thought pal
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The Ghost
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davesparks
That will only give an instantaneous snapshot, it won't help with the point in question.
Measuring the maximum and average demand can only be done with a data logging meter over a period of time.
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