Do you think it is good idea to use aluminium wire for main conductor from KWH meter to MDP ?, MDP to KWH Meter distance is about 20 meters, and aluminium wire have cost advantages
It is also good idea to connect aluminium wire to main MCCB ?

 

Personally I wouldn't, but I won't advise against it.

If you do choose aluminum be sure to properly terminate it.

 

I wouldn't either, and I'm not convinced the minor difference in cost offsets all the other issues such as termination problems; you can't easily terminate to copper/brass fittings because of electrolytic corrosion, unless its the old-style copper-plated aluminium and that's no longer used or manufactured these days.

Good article comparing Al v Cu for power transmission.

 

Ask the electric utility personnel how they do it.

 

Termination corrosion can be a problem.
I have heard of fires staring in electrical outlets due to the high contact resistance caused by this corrosion.

I had to connect aluminum wire power to my stove and I used a grease (such as this) especially made for such connections to minimize the effects of the corrosion.

 

Aluminum is not recommended inside houses inside walls. (it used to be but there was too many problems) Al is used outdoors and in main panels all the time. As Crutschow said used it correctly.

 

Here's a good video from a master electrician who really knows his stuff that might change your ideas about aluminum wiring.

 

Alu conductors need to be larger for same ampacity. also Alu is brittle, tends to break much easier than copper, specially if there is any nick or scratch. it oxidizes which is a great protection but also increases contact resistance. used properly it is fine, it is used in industry where large bus-bars or blocks would be too expensive. but it is depreciated for residential circuits. also check with your home insurance...

 

I never use AL wiring on anything, period. Late 60s and early 70s with AL wiring were fire-traps that almost burned my mom's house to the ground. The insurance company paid to remove the aluminum branch circuit wiring completely and replace it with copper. Outside AL main utility feeds are fine if done correctly with high quality terminals.

CHEAP OR GOOD – PICK ONE

 

I bought a house that had aluminum electrical wiring. Many of the receptacles were a little burned and I had to replace them with receptacles that were designed with big screwheads for aluminum wiring. Aluminum "creeps" and causes a screwed connection to become loose and make lots of heat. Also the aluminum wire size was a lot larger than copper.

 

There are insurance issues to to the difficulty in ascertaining if the proper fittings were used at the time of installation.
Many installations were carried out before the mandated wiring devices came into effect.

 

Do you think it is good idea to use aluminium wire for main conductor from KWH meter to MDP ?, MDP to KWH Meter distance is about 20 meters, and aluminium wire have cost advantages

Not for new installations.

 

Alu conductors need to be larger for same ampacity. also Alu is brittle, tends to break much easier than copper, specially if there is any nick or scratch. it oxidizes which is a great protection but also increases contact resistance. used properly it is fine, it is used in industry where large bus-bars or blocks would be too expensive. but it is depreciated for residential circuits. also check with your home insurance...

Its for my office not home... and yes... even 4x50mm2 aluminium wire prices is equivalent to only 25% of 4x25mm2 copper wire

Aluminium its rated for 150a, copper its rated for 125a, designed load is 100a maximum

 

You have been given sound advice. Choose aluminium wire at your own risk.

 

You have been given sound advice. Choose aluminium wire at your own risk.

Yes... another problem is I needs to wait for 1 months for copper wire to arrive, there is some stock shortage for copper wire in my city... I think its good for temporarily using copper wire until copper wire arrives...

 

what city is that?

 

what city is that?

Inside inner mongolia, but not all manufacture, only my favorite wire manufacture, I need to wait for about 20-45 days for copper wire

 

AL is used extensively in commercial and industrial installations here in western Canada. Substantial cost savings. You must use rated lugs, connectors

 

I am operating in central Canada and have never heard of any recent installations where Aluminum was considered.?

 

I am operating in central Canada and have never heard of any recent installations where Aluminum was considered.?

A Google search suggests that as in the US, aluminum service entrance cables are used in Canada.