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ADE7868A or ADE7878A current measurenment using shunt resistor

Category: Hardware
Product Number: ADE7868A

Hello, I am Alberto and I am working as a hardware engineer in a Spanish company. We want to make a device for energy metering on AC grids (one an three phase). The ADE7878A or ADE7868A looks good, they are 3-phase with neutral current measurement, but I have a doubt.

I would like to measure a current in a 3-phase grid using a shunt resistors, but datasheet of ADE7868A and ADE7878A sais that only could be used with current transformers or Rogowsky.

Why I can not use a shunt resistor? There is any way to use it?