A metal box or terminal fitting having separately bushed holes for each conductor shall be used whenever change is made from conduit to ___.

A metal box or terminal fitting having separately bushed holes for each conductor shall be used whenever change is made from conduit to ___.

• A. knob and tube wiring
• B. non-metallic sheathed cable
• C. type MC cable
• D. type AC cable

Answer: (A)

When switching from a conduit raceway to knob-and-tube wiring, you must contain and protect the conductors inside a metal box or terminal fitting that has separate entry points for each conductor. Knob-and-tube runs are not enclosed in a continuous metal raceway, so any splices or terminations need a proper enclosure. Having individual bushings for each conductor protects the insulation from rubbing against sharp edges and helps keep the connections secure and fire-safe. This specific configuration is a safeguard tied to transitioning to the older knob-and-tube method. Other wiring methods (like NM cable or MC/AC cables) use different enclosure and entry setups, so the separate-bushing metal box is not the defining requirement for those transitions.

When switching from a conduit raceway to knob-and-tube wiring, you must contain and protect the conductors inside a metal box or terminal fitting that has separate entry points for each conductor. Knob-and-tube runs are not enclosed in a continuous metal raceway, so any splices or terminations need a proper enclosure. Having individual bushings for each conductor protects the insulation from rubbing against sharp edges and helps keep the connections secure and fire-safe. This specific configuration is a safeguard tied to transitioning to the older knob-and-tube method. Other wiring methods (like NM cable or MC/AC cables) use different enclosure and entry setups, so the separate-bushing metal box is not the defining requirement for those transitions.