Power Metering

Your question makes little in the way of sense so I will not try and decipher what you are asking.

I will say that... normally, such a service would be metered by CTs down stream of the main disconnecting means. The CTS then feed into a regular revenue meter.

Better talk to an Electrical Engineer.

What planet is this project located on?

You'll need to hire a COMPETENT consultant.

You and Fire Pump Selection Boy (and other anons) are poster children for banning anonymous posters.

Pardon the redundicity.

There is no better occupation than separating fools from their money; even charlatans can spend it better.

It is common practice for high current metering to use a Current Transformer(s) - CT(s) - connected to a single meter. The cable(s) carrying the current to be metered must pass along the middle of the axis of a ring-shaped CT. High voltages above about 400 also usually have potential transformers between supply & meter.

Since the voltage & if the supply is 3 phase, 3 wire, 3 phase 4 wire or single phase is not given (which may require 1 to 3 CTs), nor country or accuracy requirement & installation is determined by mechanical constraints, only a local specialist could advise you. In this context, "wire" may actually be 2, 3 or 4 in parallel at the same voltage to handle a high current

I suggest entering "electrical supply metering" in Wikipedia or another web information site which will give explanations & pictures.

67model

Refer to the electrical local code and standard that should be the primary requirements. As a consultant, your professionalism is bind with your local electrical code and standard.

May be there's a secret on it.

You did not say if this is a 3 phase or single phase system.

A "window" type induction CT of the proper ratio can be used to accurately measure the current of two or more conductors passing through it as long as both conductors are the same phase and the current direction is the same in both conductors.

Most CT suppliers provide free installation diagrams and advice/guidance for installing their products.

If you are not familiar with CT applications it is in your customer's best business interest and in your best safety interest that you obtain the services of a competent, experienced system's protection specialist to review the application and provide safe direction.

BE AWARE THAT OPEN-CIRCUITING A LIVE CT SECONDARY WINDING IS IMMEDIATELY LIFE THREATENING.

The danger here is 1st, that your client definitely think he knows better than you and that is very very unusual if you are the consultant.

Bring a qualified person on the clients cost to explain the process to him and also do the installation, you and your client may kill somebody. The client can later deduct it from your fee.