Quick Hits

EPISODE 4 — Physical Damage Protection Pt.2: Fittings, Structural Joints & Cable Sheath Terminations (305.14(E)–(G))

Slide 1 — Hook "Wrapping up physical damage protection — insulating fittings, structural joints, and something specific to medium-voltage cable: sheath terminating devices."

Slide 2 — 305.14(E) & (F)

• (E) Fittings: BEFORE conductors are installed, insulated circuit conductors entering a cabinet/box/enclosure/raceway need protection via an identified fitting with a smoothly rounded insulating surface, a listed rounded-edge metal fitting, identified insulating material securely fastened in place, or integral threaded hubs/bosses. Insulating bushings made ENTIRELY of insulating material can't be used to secure the fitting/raceway itself, and the insulating material's temperature rating must match or exceed the conductor insulation's rating.

• (F) Structural joints: raceways crossing expansion/contraction/deflection joints (buildings, bridges, parking garages, etc.) need a listed expansion/deflection fitting or other approved means.

Slide 3 — 305.14(G) — unique to this article

• Where cable conductors emerge from a metal sheath and need protection from moisture or physical damage, the conductor insulation must be protected by a CABLE SHEATH TERMINATING DEVICE — this is specific to medium-voltage metal-sheathed cable construction and doesn't have a direct Article 300 counterpart.

Slide 4 — Quiz + CTA Q: "Where medium-voltage cable conductors emerge from a metal sheath needing moisture/damage protection, what's required?" A) A standard conduit bushing B) A cable sheath terminating device C) Electrical tape only D) Nothing extra is required

✅ Answer: B — 305.14(G): a cable sheath terminating device protects the conductor insulation at that transition.

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