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Space heater and PTC cable in one cable entry

Space heater and PTC cable in one cable entry

Space heater and PTC cable in one cable entry

(OP)
Hi,
We have a 230V motor space heater power cable and a shielded thermistor cable to enter into motor terminal box in one cable entry.

Please provide your thoughts and recommendations. Thanks

RE: Space heater and PTC cable in one cable entry

Dear Mr. Histor (Electrical)(OP)15 Jan 23 12:20
"....We have a 230V motor space heater power cable and a shielded thermistor cable to enter into motor terminal box in one cable entry...."
I am of the opinion:
(a) it is fine, if the shielded thermistor cable is rate for >230V say 400V.
(b) otherwise, they shall be in separate metallic or PVC conduits.
(c) A single metallic duct with metallic partition separating the two circuits are also acceptable.
Che Kuan Yau (Singapore)

RE: Space heater and PTC cable in one cable entry

Histor: Please check with your corporate specifications AND with your local authority having jurisdiction (national electric code). You might find that you require spatial distance and/or physical barriers separating "data" level signals (< 25 V) from low voltage (25 - 480 V) and both of those from higher voltage levels. You may also find that there is a requirement to separate "power" cables from "instrument" cables, regardless of voltage level.

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