If there are no approved separations between conductors, which class of conductors is allowed to share a cable with power-limited conductors?

• A. Class 2
• B. Class 1
• C. Class 3
• D. Class 4

Answer: (A)

The main idea here is sharing cables safely when there’s no approved separation between conductors. Power-limited conductors are categorized to keep heat, voltage, and interference within safe limits, and the rules allow mixing only with conductors that have the same power-limited classification. Among the options, Class 2 is the one designed to be run together in the same cable with other power-limited conductors when there are no barriers or separations. This makes it the appropriate choice for sharing a cable with power-limited conductors.

Non-power-limited conductors (Class 1) require separation from other circuits to prevent interference and heat issues, so they aren’t the ones allowed to share in this situation. Class 3 is also power-limited, but its usage and separation rules are more restrictive than Class 2, so it isn’t the general go-to for sharing without separations. Class 4 isn’t a recognized category in this context.

So, when there are no approved separations, Class 2 conductors are the ones allowed to share a cable with power-limited conductors.