Locating system for a cable system having a backbone and...

Details Locating system for a cable system having a backbone and... Locating system for a cable system having a backbone and...

2006-03-07

2006-03-07

Ledynh, Bot (Department: 2862)

Electricity: measuring and testing

Conductor identification or location

Inaccessible

Reexamination Certificate

active

07009375

ABSTRACT:
A constant current termination is provided for cable locating tones on communication and control cables that may be buried or placed in underground duct structures. The constant current termination limits the current on each branch of the cable to that required for cable location, thus ensuring that branches furthest from the tone source have adequate current for location purposes. The termination is the same for each branch, regardless of its position along the cable system. This eliminates the need to calibrate and recalibrate termination distances for a cable on installation and when branches are added. It also allows the location of damaged cables where the tone signal strength on a damaged branch is less than that for which the termination was designed.

REFERENCES:
patent: 3980840 (1976-09-01), Koster
patent: 6411074 (2002-06-01), Kruchowy et al.

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