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#79214 - 12/07/01 05:35 AM 7200 V - Feeder or Service?
Scott Yeazell Offline
Junior Member

Registered: 12/03/01
Posts: 4
Loc: Springfield, OH, USA
A college campus installation starts at a utility owned pole, customer owned 7200V underground conductors run to a customer owned padmounted 7200V switch and fuse, from there 7200V conductors loop to a series of padmount transformers, each feeding a seperate building.
Question: Are the 7200V underground conductors from the switch to the padmount transformers, a feeder or service conductors? Do they require an underground warning ribbon?

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#79215 - 12/07/01 06:59 AM Re: 7200 V - Feeder or Service?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
See the 1999 NEC, Table 300-50, Exception No. 3 for underground installations over 600 volts.

...... A warning ribbon or other effective means suitable for the conditions shall be placed above the underground installation.
_________________________
Joe Tedesco, NEC Consultant

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#79216 - 12/07/01 01:09 PM Re: 7200 V - Feeder or Service?
Scott Yeazell Offline
Junior Member

Registered: 12/03/01
Posts: 4
Loc: Springfield, OH, USA
Joe,
Table 300-50 Exception No.3 only applies to conduits & raceways that are "under a building or exterior slab" This exception waives the minimum cover requirements. My installation is not under a building or exterior slab, it is direct burial conductors not "conduits or other raceways", and mine are buried according to the minimum cover requirements. Exception #3 doesn't apply in my case.

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#79217 - 12/07/01 07:05 PM Re: 7200 V - Feeder or Service?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
You should read this NIOSH report to see if a "warning ribbon" would save a life someday!

http://www.cdc.gov/niosh/pdfs/98-131.pdf
_________________________
Joe Tedesco, NEC Consultant

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#79218 - 12/08/01 03:56 AM Re: 7200 V - Feeder or Service?
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
At a telecoms facility where I worked some years ago, some outside contractors nearly put a JCB digger shovel into a buried 11kV cable.

It was only the hatched black/yellow warning tape that alerted a manager to what was about to happen. The digger crew intended to carry on through the tape (more Darwin Award candidates?) but the boss saw the tape in time to stop them.

Warning tape is cheap. I'd use it.

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