prcscct wrote:I have no choice concerning the 3 phase as that's the way the entire development is set up.
I brought up the issue with the developer as the wiring is different (at least from meter to house) with the two different sizes and if I make a mistake initially, it's a big problem to change it later. Something like 4 x 16 vs 9 x 25. Unfortunately, I'm the only one there with a bore and pool so can't compare to other dwellings.
In any event, this is a good start. Thanks again. Pete
Not to sure if you have a typo or bad advice concerning the cables.
4x16 will refer to 4 conductors of 16 sq mm area. 9x25 should be 4x25, which again refers to the area of the cable. There is no hard and fast rule concerning the amp capacity of a conductor, many variables have to be taken into account, such as if it is enclosed in a conduit, if so how many conductors, the length of the run, (most important to calulate the volt drop), if the cable is overhead in open air ,etc., are just some of them.
I would recommend you have them install 4x25 sq mm. There is no exact size conversion from AWG for this size conductor, but as a a guide #4 AWG is 21,5 sq mm and a "ball park" ampacity of 105 amps, and #2 AWG is 33.5 sq mm, with a "ball park ampacity of 120 amps. So 25sq mm falls in between. It is always better to have more, rather than less, or minimun. You will then have to use the larger size meter quoted.
As a side I am always a bit concerned about 3 phase supplies in a complex such as you are talking about. The single phase loads are connected from 1 phase to the neutral and have to be divided up around the 3 available phases. It is very difficult to arrive at a "balanced" distribution in such a system, and the result can be out of balance circulating current(s) flowing around causing head scratching problems. Not much you can do about it as a consumer, just ensure that they install a good earthing (ground) system from your distribution board.
