Electrical Equipment Standard Distance

the distance considered to be safe while working in a substation depends upon various factors.

voltage level on which personel is working on

amount of humidity present in atmosphere

amount of pollution in the working enviorment

so you have to be certain about such parameters while working because creepage distance or safe distance may vary with respect to conditions.

no one can tell you exact distance unless these parameters are known.

There are fixed minimum dimension of substation and clearance space between equipments , nearest wall etc as per local electrical authorities in almost all countries except countries like somalia,ethopia etc.