This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
This wiring shows the light fixture and the electrical source between the switches. Three-wire cable runs throughout and the hot source is splice to the common on SW1. The common on SW2 is spliced through to the hot on the light fixture. The travelers from SW1 are spliced at the fixture outlet box to run to the 4 way switch.
A 30 amp circuit was once the norm for large, high voltage appliances like kitchen ranges. This type of receptacle provides 240 volts and 30 amps of current. The smallest cable allowed for used with a 30-amp circuit is 10 gauge, but 8 gauge may also be found. A 3-conductor cable is needed to carry a total of 240 volts and a neutral return. The circuit is wired to a dedicated 30 amp circuit breaker.
A 4 way switch must be wired between two 3 ways as shown in the diagrams on this page. A 4 way has five connections: one ground, and 4 circuit terminals divided into two matching pairs. Each pair of terminals should be wired to the traveler wires from one of the 3 way switches. The travelers can be wired to either terminal in a pair, but don’t mix up the pairs or the circuit won’t work properly.
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