A grounded conductor may use the same insulation as an ungrounded conductor of the same circuit, if the system is a maximum of 1000 volts. Which statement correctly captures this rule?

• A. Grounded conductors must always use different insulation
• B. Grounded conductors may use the same insulation as ungrounded conductors up to 1000 volts
• C. Grounded conductors must be insulated with color-coded insulation only
• D. Grounded conductors require insulation rated above 1000 volts

Answer: (B)

In limited-energy systems, the voltage rating of the insulation is what matters most. If the system voltage is 1000 volts or less, a grounded conductor does not need special, separate insulation from the ungrounded conductors in the same circuit. As long as the insulation is rated for the system voltage, the grounded conductor may use the same insulation we use for the ungrounded conductors. This keeps installation simpler and cost-effective while staying within the allowed limits.

So the correct idea is that grounded conductors may share the same insulation as ungrounded conductors up to 1000 volts. The other statements push unnecessary restrictions (such as always requiring different insulation or insisting on color-coding-only insulation) or requiring insulation rated above 1000 volts, which doesn’t apply when the system voltage is capped at 1000 V.