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kelossus

Dedicated Circuit Advice

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I am wanting to install two dedicated circuits for hifi gear. One circuit for the power amplifiers and one for all the other gear. I had an electrician out today to give me a quote and he couldn't quite understand why I wanted to do it. I assume most sparkies would find these requests quite odd and not something that happens everyday.

 

It is a freshly renovated older home and one thing he noticed is it only has 6mm cable from the mains to the box. He mentioned if I was to upgrade this to 16mm cable I would need to move the meter boxes to the front of the property. Part of me just wishes he would run the 16mm without moving the meter boxes as it would be a very quick job with easy access to everything.

 

In the end he recommended installing one 32 amp circuit and one 20 amp circuit for the time being and see if the 6mm feed is adequate.

 

On a side note does anyone know any sparkies in Brisbane who have done this before and also what are the best GPO's to use?

Edited by kelossus

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Hmmm I really should get my contractors licence.

We he has suggested seems excessive as the current draw won't be anywhere near that. Cable size is good though.

Think Zaph and a few others comment on this a bit. If you do a search you should find what others have done.

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3 minutes ago, Bunno77 said:

Hmmm I really should get my contractors licence.

We he has suggested seems excessive as the current draw won't be anywhere near that. Cable size is good though.

Think Zaph and a few others comment on this a bit. If you do a search you should find what others have done.
 

I have done a quick read and most suggest running 6mm cable for the dedicated circuits. What he was pointing out is that the cable from the mains is only 6mm to begin with.

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Yeah I understand. He'd have to do some Max demand calcs and that will determine what he can add.
32 and 20 is excessive as current draw will be nowhere near that. He's just guessing.

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I was kinda pushing for a 32 amp circuit but I think 20 amp circuits would suffice. I was just imagining have two huge Krell Monoblocks and wanting a larger circuit for them. Will likely never materialize though.

 

The main concern for me is the 6mm mains. I would really like to change it to 16mm, in line with current homes but having to move the meter boxes is a pain in the arse. Was hoping a sparkie on SNA would inform that their is no need/obligation to move the meter box or that 6mm from the mains would be enough. I doubt the latter though.

 

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10 amp outlets are enough for anything available in Australia, nothing draws close to 10amps. The breaker will be different.

It's really difficult to say without seeing your board and what's in the house and not something anyone but a contractor should give advice on really.

I'd get them to install 16a breakers, 6mm cable, 10a outlets. If it trips anything you would then need to upgrade mains. It won't though. I believe now the main iso should also be a breaker so it will be safe.

The thing is the legalities and Max demand.

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Why 6mm2 cable ?

4mm2 handles up to 30amps depending on length, voltage drop, installation (assume it is running through with insulation). 

30amps = 7200w. 

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52 minutes ago, frankn said:

Why 6mm2 cable ?

4mm2 handles up to 30amps depending on length, voltage drop, installation (assume it is running through with insulation). 

30amps = 7200w. 

Happy enough to use 4mm. No real reason to use 6mm but the sparky suggested it. It would be a roughly 20 metre run of cable. Any suggestion on cable to use?

 

The two cables will run external to the house in a conduit. I don't foresee this causing any issue?

 

Considering using these Elsafe GPO's.

QD-power-colours_2.jpg

image.png

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With the current draw, derating and length it could be 2.5mm2 like most domestic power circuits but many use a larger CSA for audio and believe there to be benefits. For the cost difference it is what I would most likely do. 

 

 

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