
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
4-9
Monday
, November 26, 2001 1:09 pm
Safety Practices – General Rules
General safety considerations include:
• Perform all tests with the apparatus under test removed from
service and made safe for testing.
• Strictly observe all company rules for safe practice in testing,
including tagging during testing and maintenance work.
Always adhere to manufacturer’s circuit breaker specifications.
State, local, and federal regulations (e.g., OSHA) may also apply.
Company rules and government regulations take precedence
over Doble recommendations.
Grounding
Grounding considerations include:
• Solidly ground or earth the apparatus under test, the TDR9000,
and any other external equipment being used.
• When the TDR9000 is permanently housed in a vehicle, bind
the Instrument ground to the vehicle chassis, which in turn is
grounded.
When dealing with capacitors:
1.
Close all the grounding switches on the device housing in order to
ground the bottom terminals of the capacitor.
2.
Make sure capacitor stacks are discharged before personnel come
into contact with them.
Internal resistors must not be relied upon for discharging individual
capacitor cells; resistors in failed capacitor cells should be considered
suspect. For additional protection, Doble recommends that a shorting
wand be applied to the terminals of individual cells before personnel
come in contact with them.
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