MAIN ELECTRICAL POWER CONNECTION

[i.qasim]

as I have tried to show in the pic, my question is,... can we do that?

lets suppose a scenario,

I have incoming cable say 300 mmsquare, splitted into three connections say 100 mmsquare(suppose)

I have an electrical energy meter installed on each of the three connections, supplying 60 A each.

the problem is... I have a load that requires more than 60 A.

Can I re-unite the cables to one cable respecting the color codes etc, and get my required power?

*** It's a rush project and we dont want to do all the process of service provider again.

 

[iwire]

Not allowed under the NEC.

You would have overcurrent devices and conductors in parallel that are prohibited from being in parallel.

 

[i.qasim]

Not allowed under the NEC.

You would have overcurrent devices and conductors in parallel that are prohibited from being in parallel.

How?

I mean, it is same as having multi cores for each phase,
which is allowed.

we only have energy meters in the path

let me rephrase my question:

does an energy meter placed in between two points A and B, changes anything like phase, voltage, current attributes of electricity from A to B? or Not!

 

[roger]

As Bob says, the upstream OCPD's will be in parallel when you do this which is a violation of NEC 240.8

Roger

 

[i.qasim]

As Bob says, the upstream OCPD's will be in parallel when you do this which is a violation of NEC 240.8

Roger

sure it is,


thank you for NEC ref.

 

[iwire]

sure it is,


thank you for NEC ref.

Even if you don't have OCPDs in pararallel the NEC prohibits pararallel conductors of the sizes you would be using.

 

[i.qasim]

Even if you don't have OCPDs in pararallel the NEC prohibits pararallel conductors of the sizes you would be using.

thanks

is there any ref to NEC for that?

I mean for OCPDs, I checked. But for Cable sizes!!

 

[iwire]

In the 2014 NEC it is 310.10(H)

 

[Jraef]

How?

I mean, it is same as having multi cores for each phase,
which is allowed.

we only have energy meters in the path

let me rephrase my question:

does an energy meter placed in between two points A and B, changes anything like phase, voltage, current attributes of electricity from A to B? or Not!

You are in Saudi Arabia. I would imagine our NEC would not apply. You may have a similar restriction in your codes however. We would not be a good source for that.

As to the metering, there is no noticeable effect on a circuit from running it through a CT, assuming that's what you mean. Whether or not it shares the load equally is debatable. Even a slight difference in resistance of a connection will have an effect on current sharing, and you have a lot of connections in this scheme.

 

[Haji]

I have incoming cable say 300 mmsquare, splitted into three connections say 100 mmsquare(suppose)

If the splitting of incoming cable say 300 mmsquare is done in a panel, the load requiring more than 60A may be tapped from the panel through an energy meter.