Installing
Convenience Devices

[lesson title]

POWER OUTLETS

Usually, power outlets for ranges, welders, electrical furnaces, and clothes dryers have 220 volts or more.

Figure 2-11. Power outlet

Figure 2-12 shows a flush-mounted outlet. The grounding conductor is hooked to the back of the box with the green screw. This screw can have no other purpose than to ground the device.

Figure 2-12.   Flush-mounted outlet

Figure 2-13 shows a surface-mounted power receptacle. The cable used for this installation is three-conductor cable with a ground. The grounding conductor is hooked only to the outlet's steel frame.

Figure 2-13.   Surface-mounted power receptacle

Figure 2-14 shows a power plug. Notice that there are blade connections for only three conductors (two hot and one neutral). There is no connection point for a grounding conductor.

Figure 2-14.   Power plug

On ranges, dryers, ovens, and surface cooking units, the neutral terminal is also the grounding terminal. A jumper is applied to the appliance's metal frame and to the neutral terminal to ground the appliance (Figure 2-15).

Figure 2-15.   Terminal block on appliance frame

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