Home Electrical Wiring

[jenkins]

just because a meter on a pole says its capable of supplying 100 amps , doesn,t mean it can !

its the supply lines above, that come from afar, that determin how much current(amps) that can be "drawn"

usually, in 3rd world countrys its very limited,

if lots of people are tapped into this ovehead supply , it can only supply a certain amount of current (amps) to each house-hold ---- simple!!!!! share and share alike

100 amps? what the hel_l would you want 100 amps for? a factory ?

if you require 100 amps you need it split over 3 phases(a 3 phase supply) (415 volts )each phase to ground / neuteral would be 220-240vac x 3

[elkangorito]

I did grumpy's max demand calculation based on 3 bedrooms, and 2 bathrooms with the normal living room, a kitchen, carport and porch (plus whatever other rooms he mentioned in his drawing). I allowed for 48 double power outlets & one 15 Amp outlet, 17 lighting points & two 3.6kW instantaneous hot water heaters. Each light was assumed to be less than 60 Watts (incandescent) or 40 Watts (fluorescent). The total calculated maximum demand came out to be about 50 Amps, according to AS/NZ 3000:2000.

This demand does not warrant the installation of 3 phase.

If two single phase 220v 3kW motors are to be added (assumed power factor of 0.8), then the new maximum demand would be about 76 Amps, which is bordering on warranting the installation of 3 phase.

This quote edited by Elkangorito.

100 amps? what the hel_l would you want 100 amps for? a factory ?

As you can see, the above max demand calculation initially was about 50 Amps, until 2 x 3kW motors were added, at which point it then became about 76 Amps. As you may also know, Thailand is not like many Western countries where water from the tap is expected to be provided at all times & cleanly. Here in Thailand, pumps are used for many things, especially water.

As more consumers in Western countries become more affluent, they tend to buy more & more electrical items. I remember, when I was a kid, the supply to our house was protected by a 20 Amp fuse which only blew under fault conditions. Now, my parents house has a 100 Amp supply due to the amount of appliances, outlets, lights etc they have. Mind you, they have been quite extravagant about their lifestyle.