2x hot water Cylinder in one house?

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berman002

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#151857 8-Sep-2014 09:48

Hi Guys, i got an issues here, our property have a main house and a studio, we want to install a separate hot water cylinder for the studio now. we would like to know for a normal house electricity power, would that be enough for 2x hot water cylinder + all other white-ware? for example main house: 180L hotwater cylinder, normal standing oven/stove, 1-2x heaters, washing machine. studio: portable stove (2400W) and oven (2000W) + heater + 130-160L hotwater cylinder.

do you guys think it's enough for a normal house electricity supply?

Regards
Bermsn002

Coil

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#1124063 8-Sep-2014 09:49

Shouldn't have an issue, Given your wiring is up to spec to handle the amps that will travel over it.
Electricians should fit the cylinder and advised if there are any issues.

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berman002

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#1124069 8-Sep-2014 09:56

They said 2 hot water cylinder is not an issues but 2x standing stove/oven is not. but i do not know does portable stove and oven ok or not.
standing stove/oven use around 10Kv max is it?
thanks

timmmay

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#1124086 8-Sep-2014 10:09

This isn't something that can be answered by an online forum. You'll need to have an electrician check your wiring and give you a definitive answer.

Coil

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#1124087 8-Sep-2014 10:11

timmmay: This isn't something that can be answered by an online forum. You'll need to have an electrician check your wiring and give you a definitive answer.

Second to this, So many variables. We dont want another DIY story that costs a family their life from overloading the wiring and causing a fire.

berman002

44 posts

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#1124202 8-Sep-2014 12:30

yes sure, i got an plumber/electrician to do the work, but i would like to check to see what he said is true or not.
i need a second opinion. i just find out most older house got a 40amp cable into the house only, but newer house got a 60amp.
this is something the electrician didn't tell me but i would like to know.

Regards
Berman002

Bung

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#1124215 8-Sep-2014 12:44

Having more than 1 stove/oven means that you already may have more than 1 phase connected to your property. Our house was once 2 flats with 2 of everything and effectively 2 connections. The power is now on 1 account after the flat was absorbed back into the house and 2nd stove removed but is still on 2 phases.

gzt

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#1124281 8-Sep-2014 13:31

berman002: yes sure, i got an plumber/electrician to do the work, but i would like to check to see what he said is true or not. i need a second opinion.

I would trust the electrician's assessment. There is no reason for that to be intentionally misleading.

But if you really need a second opinion, you need a second electrician. It will not be expensive.

Zeon

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#1124340 8-Sep-2014 14:26

Why do ovens need to be on separate phases?

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DarthKermit

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#1124395 8-Sep-2014 15:19

Zeon: Why do ovens need to be on separate phases?

To balance the load on the different phases.

Whatifthespacekeyhadneverbeeninvented?

Bung

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#1124400 8-Sep-2014 15:24

I don't know if it's a have to be or just a convenient way of splitting load. Some single ovens can have elements on different phases.

Aredwood

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#1124608 8-Sep-2014 18:05

You would also need to check if the lines company / power board in your area has any rules for connecting hot water cylinders. As some areas have requirements that if the cylinder and element sizes are over certain amounts then the cylinder must be connected to ripple control. Also there may be a requirement for the stove to be connected to 2 phase power. (unlikely to apply to a little benchtop stove) Although your sparky should (hopefully) know of whatever rules apply in your area.

As for capicity of the cables from the street to your house and the house to your sleepout. The sparky can easily install circuit breakers on these cables to limit max current if there is any questions over their size.

Also there are houses out there which have incoming mains cables rated to only 30A. Yet they will sometimes have a pole fuse (main fuse where the cable from your house joins the power lines in the street) which is rated at 63A. This is because the power company is only required to provide protection against short circuits in your mains cable. They don't have to provide protection against overload. So if your mains cable is rated to less than 63A then there should be means of limiting current to a lower value. A big circuit breaker on the incoming cable is only 1 method of achieving this - there are other ways as well.

As said by others, if you think there is problems with the way things have been done. Then call another sparky for a second opinion.

gregmcc

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#1124616 8-Sep-2014 18:21

berman002: They said 2 hot water cylinder is not an issues but 2x standing stove/oven is not. but i do not know does portable stove and oven ok or not.
standing stove/oven use around 10Kv max is it?
thanks

Typically a stove/oven combo unit is 14Kw not 10Kv(Kilovolts which would be 10,000 volts), typical hotwater cylinder is uup to 3Kw, slightly less than 1/5 of an oven.

gregmcc

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#1124619 8-Sep-2014 18:24

berman002: yes sure, i got an plumber/electrician to do the work, but i would like to check to see what he said is true or not.
i need a second opinion. i just find out most older house got a 40amp cable into the house only, but newer house got a 60amp.
this is something the electrician didn't tell me but i would like to know.

Regards
Berman002

a plumber/electrician........sounds dodgy right away. Some plumbers seem to think they are electricians as well......ask for their practising license number to make sure they are legally allowed to do electrical work

Elpie

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#1124626 8-Sep-2014 18:49

gregmcc:
berman002: yes sure, i got an plumber/electrician to do the work, but i would like to check to see what he said is true or not.
i need a second opinion. i just find out most older house got a 40amp cable into the house only, but newer house got a 60amp.
this is something the electrician didn't tell me but i would like to know.

Regards
Berman002

a plumber/electrician........sounds dodgy right away. Some plumbers seem to think they are electricians as well......ask for their practising license number to make sure they are legally allowed to do electrical work

Also insist on getting a safety certificate from them. Electricians do this automatically when they do this kind of work. Usually it's just a stamp or statement on the invoice (and make sure you keep this invoice) but if there isn't a certificate then you may find your property insurance won't cover you in the event of the wiring causing a problem.