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CELLULAR SITE EMERGENCY POWER CONNECTOR TESTER

IP.com Disclosure Number: IPCOM000007292D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2002-Mar-12
Document File: 3 page(s) / 149K

Publishing Venue

Motorola

Related People

Raymond L. Grimes: AUTHOR

Abstract

A positive and simple method of both mechani- cal and electrical testing by skilled workers was needed. This emergency power connector tester serves that purpose, and has proven itself on numerous facility inspections.

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MO-LA Technical Developments Volume 23 October 1994

CELLULAR SITE EMERGENCY POWER CONNECTOR TESTER

by Raymond L. Grimes

  A positive and simple method of both mechani- cal and electrical testing by skilled workers was needed. This emergency power connector tester serves that purpose, and has proven itself on numerous facility inspections.

INTRODUCTtON

  Cellular Telephone base station facilities oRen include an exterior emergency AC power connector which may be used in the event of a power outage, to connect a portable generator. Appleton and Crouse-Hinds make similar and interchangeable heavy-duty weather-proof AC power connectors which are widely used in these applications. Upon inspecting completed new sites, it became apparant that a number of these facility emergency power con- nectors had been installed incorrectly. Several local electrical contractors had been used to complete these installations, yielding varied results. Upon casual inspection, a power connector installation may appear to have been installed properly, however when a mat- ing generator plug was attached, the connections were found to be incorrect. In some instances, the mat- ing plug could not be mechanically attached due to connector pin misalignment. If a post-construction facility inspection had not been made to determine emergency connector functionality, then such prob- lems would be first-discovered on the day when the generator was needed, in an actual emergency.

  Common facility connector problems appeared in two catagories, mechanical and electrical. The mechanical problems were mostly pin misalignment. This was traced to the installation procedures used by contractors where the electrical subpanel wiring was installed and wired first. The electrician would then "stuff' the excess wiring into the facility con- nector and forceably assemble the connector head. This caused the female pins to tilt out ofalignment. At worst, the mating connector simply would not fit, and no connections would be made. The electri- cal errors were potentially more serious. Transpos- ing a neutral and hot lead could result in a serious accident. Such wiring errors could be attributed to contractor carelessness, inadequate training, and no specified method oftesting.

  This test unit was designed to allow one person to make all basic checks of a Cellular Telephone site facility emergency power connector installation. The clip leads provided can be attached to the emer- gency power connector wiring side of the facility elec- trical transfer switch (with facility AC power shut oh). The test unit plug can then be attached to the facility mating female power connector.

  An effort was made to use test lead wiring color codes which are consistent with the recommenda- tions of the National Electrical Code (NEC). For instance, green will always identify the equipment ground. White may identity grounded neutral, and yellow and black identity the 220 VAC hot leads "H-l" and "H-2" respective...