A digital multimeter is set up as shown in the illustration to test an individual element of a three-phase immersion heater. The elements are connected across terminals 1 and 4, 2 and 5, and 3 and 6 as shown. The reading across terminals 1 and 4 is 32 ohms. The reading across terminals 2 and 5 is 32 ohms. The reading across terminals 3 and 6 as shown is "OL" ohms. What is condition is indicated? EL-0216

Question

Accepted Answer

Option C: The element across terminals 3 and 6 is open-circuited. The other two elements are functioning properly.. An 'OL' (open loop or infinite resistance) reading on a digital multimeter across a heating element pair signifies a severed or burned-out internal resistance wire. Per IEEE 45 continuity testing methods, finite readings on other terminals confirm normal operation elsewhere.