CSLB C-10 Electrical ContractorSafety and TestingEasy
An electrical worker is conducting a continuity test on a newly pulled feeder conductor using a multimeter. The multimeter indicates an 'OL' (Over Limit/Open Loop) reading. What does this reading most likely indicate?
- AA short circuit in the conductor.
- BExcessive current flow through the conductor.
- CAn open circuit or a break in the conductor.
- DA complete and healthy circuit.
Show answer & explanationAnswer & explanation
Correct answer: C. An open circuit or a break in the conductor.
In continuity mode, an 'OL' (Over Limit or Open Loop) reading on a multimeter typically indicates infinite resistance, meaning there is no complete path for current to flow, which signifies an open circuit or a break in the conductor.
Why the other options are wrong
- A. A short circuit would show very low or zero resistance, not 'OL'.
- B. A continuity test does not measure current flow; 'OL' indicates resistance, not current.
- D. A complete and healthy circuit would show very low resistance, indicating continuity, not 'OL'.
Multimeter 'OL' Reading
An 'Over Limit' or 'Open Loop' indication on a multimeter, usually in continuity or resistance mode, signifying infinite resistance or a break in the circuit.
- Indicates open circuit
- No complete path for current
- Common in continuity/resistance modes
Memory trick: OL means Open Line!