Well, there isn't anything special about ASIC miners when it comes to electrical wiring, your friend needs to follow the same set of principles he follows elsewhere, you just have to give him the key information needed to run the miners and that will depend on what type of miners you are trying to put in that farm.

Bitmain gears (ignoring the old models) all use two C13 cables and consume on average 3kw, Whatsminer on the other hand, uses a single C19 connector and consumes anywhere between 3kw to 3.5kw depending on the exact model and the effienct within the same model.

The majority of these ASIC miners are voltage sensitive, so if you are not sure about the stability of the voltage, you might ask him to install some sort of voltage protectors to avoid PSU damage.

The MCBs / fuses sizes and all the wiring will depend on the code of your country.