i know 3 phase wiring is 3 16mm live wire + 25mm N wire into one db 3phase elcb. can we actually do this instead using 3+1 we do 1+1 16mm L+ 16mm n wire into 3 diffrrent db from the meter (each phase get each db (house got 3 db)) means we pull 6 wires instead of normal 4. ?

sorry i dont really know how to draw

Current set up single phase
Meter --- L 16mm+ N 16mm--- DB1 ---loop to ---DB2

Normally 3 Phases if I am not mistaken
Meter --- L 3x 16mm+ N 25mm (not sure is the correct size for N, read some where else)---DB1 ---loop to DB2

Can I just add 4 new 16mm wires (Examples)
Meter --- Phase 1 --- L 16mm+ N16mm to DB1 ---loop to DB2 (dont need to hack or disturb current wiring) (1x1.5hp ac + 1wh+ all lightings)
Meter --- Phase 2 --- L 16mm+ N16mm to DB3 (3x1.5hp ac + 1 Wh + Kitchen appliances + 10 13A Socket)
Meter --- Phase 3 --- L 16mm+ N16mm to DB4 (3x1.5hp ac + 2 Wh + 10 13A Socket)

wei kee, small house only 22*75 5room+4bathroom. so house need 4wh. 7-8 ac. i wont pasang straight all the ac, except their piping and wiring.
ori wiring only got 1wh + 1ac point so really need to do wiring.

I plan to use intant wh one. i think its alot cheaper. wh with pump is around 450-550. so total will be around rm1800-2200. if used solar one need to do piping which would cost alot of money. now i would only need to do wiring for 3 toilet, which is only around 350 additional.

*when i move in i will only install 2unit first...budget problems

wei kee, those diagram is for one db with 3 rows?

just starting to survey for products... hager 20A mcb is rm7.80 each. is the correct price? while eps/maxguard or amber is just rm4. hager can be used in sg but eps brand is not approve in sg.

erm, this one based on the boss is ori and sirim approve, selling at dealer pricing. usually the price is hw much? maybe later i snap some photo and see.

honestly i got no idea, its 1pole 20A mcb. what is the normal pricing? later abit i take photo of it.

this is the picture of the mcb, any way to know is clone?


Attached thumbnail(s)

have no idea where is that hager made from, not written any where on the mcb, accept written made by hager. btw one inch white pipe can insert how many 4mm wires ideally. i know can the pipe sure can fit up to 12-15 wires. what is the different with grey pvc pipes?

anyone knows is three phase tariff is same as single face?

sorry.

This post has been edited by Eng_Tat: Jul 14 2012, 09:12 PM

Your double poll switch is 63A, but the elcb is 40A. You should used 63A elcb as well normally. Do you used water heater as well, if yes, you should used separate Elcb for the heater, sensitivity rated 0.03.

Double pole is to cut off incoming from meter both N & L before going to the ELCB.

if your load is more then 40A, then you should change the the main ELCB, also i would recommend to put in another ELCB for heater.

yes, but many Malaysian i notice don't really know's about putting additional safety for their WH...

yes that's true that most wh comes with elcb, but we do still hear ppl get electrocuted. a proper stand alone elcb/rccb cost more than rm100, and we are not sure about the quality that comes with wh units as well. also a proper 13A socket is suppose to be paired with .03A sensitivity RCCB instead .1A sensitivity RCCB which is common practice in MY.

You can used armoured 4 core 16mm size. Or even better 25mm cables.

Yes. 16mm is actually standard size to be used for 3 phased. if we don't really exceed 60A i don't see the need of 3 phased. can just used single phase with 25mm 2 core to cut cost.

Do you really need 3 phase? single phase (60A incoming) can run 6 X 1.5HP AC (5Ax6) simultaneously with a lot of spares. Last time my house i did rewires for 3 phases ready (originally came with 2 core 16mm and i added another 2 core 25mm from incoming to the db to make it 3 phase ready, but i ended using single phase for nearly 3 yrs now nvr had an issue or tripping. can check what i did at my tread.