DEVItector™ II V2User Guide
BC421332622232en-010101 2022.07 | FEC | ©Danfoss | 15
Common types of electric heating cables
Before you start measuring the cable, it is important to know the dierent types of faults, and how they aect
the diagnosis. The 4 most common cable types are shown below. They feature from one to three conductors,
including the optional screen. Heating cables having more than three conductors are treated similar to twin
conductor cables.
Note: Only heating cables with two or more conductors can be handled by the DEVItector™. The tracing prin-
ciple is based on an electrical return path within the heating cable. So, keep in mind that “Single conductor
without screen” cable is not possible to be handled by the DEVItector™.
Single conductor without screen
Single conductor with screen
Twin conductor without screen
Twin conductor with screen
Connection coupling: End coupling:Cold cable: Heating cable: Screen:
Fig. 21: Four types of heating cable. The rst two cables are single conductor cables, and the last two are twin
conductor cables. Drawings indicates heating conductors as “heating cable”.
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