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Electrical Manhole Grounding.

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I

Ithinkimstillhere

Member
Location
saint louis
I’m working on a large-scale project that includes a medium voltage (MV) customer owned substation situated on a campus. The setup involves several manholes used to route MV feeders to multiple buildings. Within these manholes, there are metal racks designed to support the feeders, but no splices. My plan is to bond the metal supports to a 5/8-inch copper ground rod installed outside each manhole.

My question is about grounding requirements: Since this infrastructure is located 'on-campus', do I need to bond the ground rods back to the main service entrance ground? Or would the metal parts bonded to the ground rod be considered sufficient?
 
cadpoint

cadpoint

Senior Member
Location
Durham, NC
Most new manholes that I've worked with Airport /sewer work have all come with a bonding strap for the top
and base of Vault / manhole(for the inside) then usually drive a ground rod in the hole provided in corner of the vault,
and attach the straps. Sometimes we line the bottom of the manhole with a bare ground (Spec'd)
Nothing is bonded in the run Circuits or hangers, and we always use plastic one anyways, their out of Canada
Your Job spec's may require other things, But I've never seen these straps used outside the Manhole or Vault.
 
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