Fused neutrals in old wiring systems

Electrical · Distribution Panels · printed page 96 (PDF page 97)

Book index entries

Fused Neutrals and Old Wiring Systems Old Wiring Systems with Fused Neutrals Distribution Panels – Electrical Electric Distribution Panels

Text in the illustration

shock hazard exists all along circuit back to blown neutral fuse
to ground
blown fuse
15 AMP FUSE
main power supply
fuse OK
switch
hot wire
neutral wire
power still supplied to bulb!, but bulb isn't on because blown neutral fuse breaks circuit

Generated explanation

The schematic shows an old lighting circuit with fuses in both the hot and neutral conductors. The hot conductor runs from the main power supply through an intact fuse and a closed switch to a light bulb. The neutral conductor returns from the bulb through a blown fuse, with a ground connection shown on the supply side of that fuse. Although the bulb is off because the neutral fuse has opened the circuit, the hot conductor still supplies power to the bulb. The illustration identifies a shock hazard along the circuit back to the blown neutral fuse.

Components

hot conductor neutral conductor plug fuses switch light bulb lamp socket ground connection main power supply

Defects shown

Fused neutral conductor Blown neutral fuse leaves the lighting circuit energized despite the bulb being off Shock hazard along the circuit back to the open neutral fuse

Related illustrations

0603

Fused neutrals in old wiring systems

· p. 102

The diagram shows an old lighting circuit with fuses in both the hot and neutral conductors, a switch in the hot conductor, and a light bulb. The hot-side fuse is intact, while the neutral fuse has blown and interrupted