Spacing of electrical equipment in a substation

[dup18]

All,
I am probably missing the obvious, but what document(s) are used to determine the horizontal clearances (spacing) between various pieces of electrical equipment (disconnect switch, circuit breaker, circuit switcher, metering PT/CT, etc. in a 115 kV substation?

Podo

 

[Sn00ze]

I would imagine that limits of approach. Distance between phases and the location of each piece of equipment would dictate your site's footprint.

 

[waross]

Added space for vehicle access?

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Ohm's law
Not just a good idea;
It's the LAW!

 

[jghrist]

IEEE C37.32 plus spacing for maintenance and vehicle access.

 

[dup18]

Thanks for the responses. I could not figure out that the bases (and the first 8 feet high) are basically grounded metal. Breaker control cabinets may contain 120 AC or DC. Yet the equipment is spaced far apart. Room for a truck to travel, and I guess room to remove/install some of the larger equipment - true, but more dictated by maintenance than safety codes.

Take care and thanks again.
Podo