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What's the size of the wire taking power into the the distribution board (ie colored red yellow blue)

topsy23:
Recent completed project pictures

mank1234:
What's the size of the wire taking power into the the distribution board (ie colored red yellow blue)

Size of cable(wire) depend on the total load of the building. Total load normally depend on numbers of AC, water heater. Since you are using 3-phase distribution boards it means the cable is going to be 4-core I.e red, yellow, blue and black but a separate cable for the earth.

We have the cables in different sizes:
6mm 4-core pvc
10mm 4-core pvc
16mm 4-core pvc
25mm 4-core pvc
Etc........

topsy23:


Size of cable(wire) depend on the total load of the building. Total load normally depend on numbers of AC, water heater. Since you are using 3-phase distribution boards it means the cable is going to be 4-core I.e red, yellow, blue and black but a separate cable for the earth.

We have the cables in different sizes:
6mm 4-core pvc
10mm 4-core pvc
16mm 4-core pvc
25mm 4-core pvc
Etc........

sir
a 3 phase db will use a 3 phase meter i believe?

peaceland:

sir
a 3 phase db will use a 3 phase meter i believe?

It depends boss, it can use single phase meter or single phase meter. Single phase can be converted to 3-phase with the help of looping either from the cut-out or changeover switch but if you have 3-phase equipment or appliance in the house this method is not advisable, the appliance or equipment will not work.

And again if the total load of your house is more than 60A it is advisable you go for 3-phase meter so that u can split the the total load into 3-wires

Sorry for getting back late

Thanks

Thanks sir for the response,
however I must confess I am still a bit unclear here.
1. for the little property we are working on, is that 1 or 3 phase?
2. how do you physically differentiate a 3 phase from 1 phase meter?
3. since only 1 line/phase/cutout can be working at a time, why will consumption/power cost on 3 phase be higher than 1 phase meter.
Thanks sir

topsy23:


It depends boss, it can use single phase meter or single phase meter. Single phase can be converted to 3-phase with the help of looping either from the cut-out or changeover switch but if you have 3-phase equipment or appliance in the house this method is not advisable, the appliance or equipment will not work.

And again if the total load of your house is more than 60A it is advisable you go for 3-phase meter so that u can split the the total load into 3-wires

Sorry for getting back late

Thanks

peaceland:
Thanks sir for the response,
however I must confess I am still a bit unclear here.
1. for the little property we are working on, is that 1 or 3 phase?
2. how do you physically differentiate a 3 phase from 1 phase meter?
3. since only 1 line/phase/cutout can be working at a time, why will consumption/power cost on 3 phase be higher than 1 phase meter.
Thanks sir

If I can calculate the total load of your building I will know if the meter to be install is single phase or 3-phase.

Very easy to differentiate single phase and 3phase meter. Single phase meter has 2 connection terminal which is LIVE and NEUTRAL and 3-phase has 4 connections terminal which is RED, YELLOW, BLUE and NEUTRAL.

If you are using 3-phase supply u must use all the four cut-out, which means all the 3-phase line must goint into your ditribution board through a 3-phase changeover switch. That is why the charges on 3-phase is more higher than single phse meter. But for a single phase connection only 2-cut-out must be use at a time and you can easily change to other line when there is fault or low voltage in one line.

Thanks

Can 16mm2 supply wire to a distribution box handle 4 units of 2hp ac and 3 water heater each 2kw? All can be on at the same time.

mank1234:
Can 16mm2 supply wire to a distribution box handle 4 units of 2hp ac and 3 water heater each 2kw? All can be on at the same time.

Yes 16mm2 cable is okay.

@ bolded, i believe you meant to say three phase boards/ can be looped to supply single phase not vise versa

topsy23:


It depends boss, it can use single phase meter or single phase meter. Single phase can be converted to 3-phase with the help of looping either from the cut-out or changeover switch but if you have 3-phase equipment or appliance in the house this method is not advisable, the appliance or equipment will not work.

And again if the total load of your house is more than 60A it is advisable you go for 3-phase meter so that u can split the the total load into 3-wires

Sorry for getting back late

Thanks

bizzle2:
@ bolded, i believe you meant to say three phase boards/ can be looped to supply single phase not vise versa

I mean the incoming suplly cable(Live and Neatral which is single phase) can be converter to 3-phase by looping the live through the main breaker(MCCB).

Three phase line must not be connected together. It is very dangerous to do that. It must be totally avoided.

thats what i meant as well, the single phase supply going into the three phase board is looped @ the isolator or mccb as the case may be and hence adapted to function as a single phase board,guess i misunderstood you

topsy23:


I mean the incoming suplly cable(Live and Neutral which is single phase) can be converter to 3-phase by looping the live through the main breaker(MCCB).

Three phase line must not be connected together. It is very dangerous to do that. It must be totally avoided.

bizzle2:
thats what i meant as well, the single phase supply going into the three phase board is looped @ the isolator or mccb as the case may be and hence adapted to function as a single phase board,guess i misunderstood you

Yea we are on same page now

Yes it can be converted by simple connecting the RYB to ONLY A SINGLE phase from the mains. However, this must be done by a season engineer who would have taken wire neutral wire size into consideration else you risk fire outbreak. The current that flows in three phase circuits tend to cancel each other out in magnitude in the neutral conductor since they are phased at 120degress to each other. If you convert to single phase there's no more cancelation rather the current that would flow in neutral is the sum of that in the RYB.

Note RYB denotes the wire code in your DB and not the phases from then mains.

bizzle2:
@ bolded, i believe you meant to say three phase boards/ can be looped to supply single phase not vise versa

mank1234:
Yes it can be converted by simple connecting the RYB to ONLY A SINGLE phase from the mains. However, this must be done by a season engineer who would have taken wire neutral wire size into consideration else you risk fire outbreak. The current that flows in three phase circuits tend to cancel each other out in magnitude in the neutral conductor since they are phased at 120degress to each other. If you convert to single phase there's no more cancelation rather the current that would flow in neutral is the sum of that in the RYB.

Note RYB denotes the wire code in your DB and not the phases from then mains.

Boss, there is what we called load calculations during the design stage. Total load(in Amps) normally determine the size of cable to be used for a particular project. There is a table from the manufacturer for that. I have kabelmetal and Nigerchin brochure. I don't choose load cable or supply cable anyhow. I followed the normal process in choosing cable

For example if the total of a particular building is 45A and you are using single phase connection, the size of cable should be bigger than the size of cable when using 3-phase connection. In 3-phase connection, all the loads will be distributed between the 3-wires(RYB).

Thanks

We are saying same thing differently. I already know you're a trained technician/engineer. Someone reading your earlier response may unwittingly call a roadside electrician to convert his connection.

topsy23:


Boss, there is what we called load calculations during the design stage. Total load(in Amps) normally determine the size of cable to be used for a particular project. There is a table from the manufacturer for that. I have kabelmetal and Nigerchin brochure. I don't choose load cable or supply cable anyhow. I followed the normal process in choosing cable

For example if the total of a particular building is 45A and you are using single phase connection, the size of cable should be bigger than the size of cable when using 3-phase connection. In 3-phase connection, all the loads will be distributed between the 3-wires(RYB).

Thanks

mank1234:
We are saying same thing differently. I already know you're a trained technician/engineer. Someone reading your earlier response may unwittingly call a roadside electrician to convert his connection.

Okay boss. A trained ENGINEER

Thanks

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@OP luvly work u are doing, pls which would u advice Condit plumbering or external and why.

I have a mini duplex with one bedroom, kitchen, living room and visitors toilet on the ground floor and three bedroom on the first flour all room ensuit and another one bedroom self contain ground and first floor with just a staircase seprating the mini duplex from the two one bedroom self con. Kindly give a quote for piping (elecrical/plumbering). I am getting ready for the ground floor slap. EMAIL ; Uyi.nelson@yahoo.com

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nelsonB:
@OP luvly work u are doing, pls which would u advice Condit plumbering or external and why.

I have a mini duplex with one bedroom, kitchen, living room and visitors toilet on the ground floor and three bedroom on the first flour all room ensuit and another one bedroom self contain ground and first floor with just a staircase seprating the mini duplex from the two one bedroom self con. Kindly give a quote for piping (elecrical/plumbering). I am getting ready for the ground floor slap. EMAIL ; Uyi.nelson@yahoo.com

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topsy23:
Nice weekend ahead. Call us today

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