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A "two wire" version for local service, a four wire version for toll service. Two/four wire versions were also available as was a TOPS variant that was used to provide Operator services. The first four wire switch (four wire-tops, i.e., it provided toll switching and operator services) was placed in service in Thunder Bay circa 1972.
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Grid units will always be energized on the top side from the many other units tied into the grid. A spot network is 2 or more transformers dedicated to a single customer. The grid feeds multiple customers. A network protector has a circuit breaker set of contacts and a controlling protection relay. The components are enclosed in a protective ...
The A leg goes to pin 5 and the B leg to pin 2 in the master socket. (Although all equipment will work with a reversed line, so a reverse wired socket is not strictly a fault.) When current is flowing on the line, the B leg voltage collapses to nearer ground and the A leg voltage moves nearer to the B leg voltage. The exact voltage drop is a ...
Humble or one leg hobble is a strap placed around the front pastern, and then the leg is lifted and the strap is wrapped around the upper leg and then buckled, leaving the horse with three legs to stand on. Mounting hobbles are knee hobbles that are made with a quick release, on a lead that passes to the rider. They are used to mount fractious ...
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In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.
Unless the dog is engaged, the gear will simply freewheel on the shaft. This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the "dog" name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth. In engineering the "dog" device has some special ...
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