This document does not define maintenance of communication equipment used in power
Refer to communication system operation and maintenance requirements included in these
· Bureau of Reclamation Radio Communication Systems - Management and Use -
· Department of the Interior -
Departmental Manual - Radio Communications
Information regarding operation and maintenance of Reclamation communication
systems may be found at the Reclamation intranet site: http://intra.usbr.gov/telecom.
Control circuits (usually 125 Vdc or 120 Vac) provide the path for all control functions
for major equipment in the powerplant. Reliability of these circuits is paramount.
Although tested during commissioning, these circuits can become compromised over
time through various means:
Modifications and construction work which unintentionally break circuit
integrity or introduce wiring errors.
Age and deterioration of wiring rendering the system nonfunctional.
Connections that become loose.
Failure of individual control and protection devices due to misuse, old age, or
Verifying the integrity of the control devices and interconnecting wiring requires a
"functional test" of these circuits. Functional testing of control circuits may be
considered completed in the course of normal plant operation. However, control
circuits that rarely are used should be functionally tested on a periodic basis.