I too am building a new house and need to know the amount of power supply required. Going by tkrussell's reply, I've made a list of my appliances.

The numbers in italics are estimates based on this (http://apps1.eere.energy.gov/consumer/your_home/appliances/index.cfm/mytopic=10040) list as I could not find the watts or amps for them.
* indicates frequent use (daily)
** indicates constant use (always on)


** Fish Tank Light: 18W
* Computer: 850W x 2
Phone charger: 5v x 2
Oven (stove top will be gas): ?
* kettle: 2200w
** fridge: 725w
** Freezer: 725w
microwave: 1100w
* Washing machine: 500w (65Kw per year)
iron: 1400w
TV: 120w
vacuum cleaner: 1440w
toaster: 1400w
* Pump for well: 1100w (a guess)
** septic aerator: 120w
* Energy saver light globes: 18w x10
welder: ?
sander: 800w
grinder: 700w

The house will be 112m2 and have 2 people living in it. We will have about 9 power points.

I'd also like to know- if we only need (eg) about 200w, is it more expensive to get provision for 400 or more? What's the difference?

Thank you for any assistance.

I too am building a new house and need to know the amount of power supply required. Going by tkrussell's reply, I've made a list of my appliances.

The numbers in italics are estimates based on this (http://apps1.eere.energy.gov/consumer/your_home/appliances/index.cfm/mytopic=10040) list as I could not find the watts or amps for them.
* indicates frequent use (daily)
** indicates constant use (always on)


** Fish Tank Light: 18W
* Computer: 850W x 2
Phone charger: 5v x 2
Oven (stove top will be gas): ?
* kettle: 2200w
** fridge: 725w
** Freezer: 725w
microwave: 1100w
* Washing machine: 500w (65Kw per year)
iron: 1400w
TV: 120w
vacuum cleaner: 1440w
toaster: 1400w
* Pump for well: 1100w (a guess)
** septic aerator: 120w
* Energy saver light globes: 18w x10
welder: ?
sander: 800w
grinder: 700w

The house will be 112m2 and have 2 people living in it. We will have about 9 power points.

I'd also like to know- if we only need (eg) about 200w, is it more expensive to get provision for 400 or more? What's the difference?

Thank you for any assistance.

112m2? Power points? I assume you are from the UK or another part of Europe. You are going to have to find someone familiar with European load calculations. Calculations and formulas from the US will do you absolutely no good.

I can tell you with some certainty, listing small appliances will do no good whatsoever. Things like TVs, irons and vacuums are inconsequential. At least in the US these things are taken into account under the general demand load. What is important are how many fridges, freezers, any electric heat or A/C, things like that.

I live in Australia (240V).

We will have one fridge & one freezer, no aircon/heating/cooling and the hot water system will be gas.

112m2 = 367ft2

Does that help?

No, sorry, it doesn't help me. I have NO clue what Australian codes are like.

I will say, I know that 112m2 does not = 367ft2. A square meter is over 9 square feet. :D

For your electric code, all we can do is suggest that you either purchase the code here:

http://infostore.saiglobal.com/store/Details.aspx?DocN=AS799247558161,

As recommended by:

Home - Wiring Rules - Standards Australia Limited (http://www.wiringrules.standards.org.au/)

Or see if a copy is available at a library.

Most of us here at AMHD are familiar with codes in North America.

And, 112 Square Meters will equal approximately 1205 Square Feet.

Thank you for your help.

BTW, I was just reporting what google's converter told me re the feet as we don't use ft here.