Electrician Red Seal · Question
An electrician is installing armoured cable (AC90) containing 12 AWG copper conductors for a 20 A, 120 V lighting circuit in a commercial office space. The cable will be run concealed within a drywall partition. What minimum number of conductors must be installed inside the cable, excluding the insulated bonding conductor, to comply with CEC Rule 12-610(1)?
Rule 12-610(1) states that AC90 cable shall contain at least two insulated circuit conductors. For a simple lighting circuit, a hot and a neutral conductor are
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Question: An electrician is installing armoured cable (AC90) containing 12 AWG copper conductors for a 20 A, 120 V lighting circuit in a commercial office space. The cable will be run concealed within a drywall partition. What minimum number of conductors must be installed inside the cable, excluding the insulated bonding conductor, to comply with CEC Rule 12-610(1)?
Answer options: ✅ Two (hot, neutral)
- Three (hot, neutral, isolated ground)
- Two (hot, switched-hot)
- Three (hot, neutral, switched-hot)
Correct answer: Two (hot, neutral)
Explanation: Rule 12-610(1) states that AC90 cable shall contain at least two insulated circuit conductors. For a simple lighting circuit, a hot and a neutral conductor are the minimum required to complete the circuit, with the cable's armour serving as the bonding conductor. An isolated ground or switched-hot would be additional conductors, not a minimum requirement for every circuit.
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