Insuring adequate spacing between underground distribution conductors in conduit and gas lines

Author

Parker, Thomas J. ; Ward, Daniel J.

Author_Institution

Georgia Tech/NEETRAC, Forest Park, GA, USA

Volume

18

Issue

1

fYear

2003

fDate

1/1/2003 12:00:00 AM

Firstpage

291

Lastpage

294

Abstract

The effects of faults occurring on secondary cables in plastic conduit energized at 240 V were evaluated under simulated field conditions. Secondary cables were intentionally faulted inside polyvinyl chloride (PVC) and polyethylene (PE) conduit. The test setup represented a typical, residential single-phase circuit consisting of a padmount transformer with a length of secondary cable. The fault characteristics (voltage and current waveforms) and temperatures on the exterior of the conduit near the fault were recorded. The condition of the conduit after the fault was also assessed.

Keywords

electric conduits; power cables; power distribution faults; power distribution lines; safety; standards; underground cables; underground residential distribution systems; 240 V; National Electrical Safety Code; current waveforms; fault characteristics; gas lines; padmount transformer; plastic conduits; polyethylene conduit; polyvinyl chloride conduit; residential single-phase circuit; secondary power cable faults; test setup; underground distribution conductor spacing; voltage waveforms; Circuit faults; Circuit testing; Communication cables; Conductors; Current transformers; Fault currents; Fuels; Plastics; Polyethylene; Protection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2002.804010

Filename

1159933