Combine CTs to measure the total usage

I’m planning to combine a few switches into one CT. I’m wondering if there is any issue running multiple cables through a CT to measure the total consumption of all switches together?

If this is in the US you need to make sure of the direction of the wires through the CT in relation to phase. Also want to size the CT to be larger then the combine current of the circuits.

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Thanks. I’m in Australia. I’ve made sure the sum of circuits are lower than my CT for combined circuits. Let’s see how the results would look like.

If you are three-phase, you can only group switches on the same phase