All this would depend on the type of network.

Mosty the electrical tranformers and UPS are located in the basement or in a diffrent rooms in a datacenter.

Device which can be effected by frequncy need to be kept in mind and should be located in diffrent location.

In a simple senerio i would consider keeping the Electrical tranformers out of the rack room. If not atlest 10 Meters of distance.