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either one or two cables The two black wire leads on the switch are connected to the hot circuit wires with wire connectors If the switch box contains two white neutral wires, they are connected together with wire connectors The bare copper grounding wires are pigtailed to the grounded metal box AC manual motor starting switches are heavy-duty switches that provide manual on/off control of single-phase or three-phase AC motors where overload protection is not required or is furnished separately Typical ratings for single-pole, double-throw switches are 250 V AC, 30 A or 600 V AC, 20 A Three-pole, three-phase switches have ratings of 600 V AC, 30 A These switches are used to control machine tools, pumps, fans, and conveyors in industrial and commercial facilities Switches intended to control motors also have horsepower ratings Two-pole switches are rated for either 2 or 3 hp, and three-pole switches are rated from 7 to 10 hp To qualify for an hp rating, a motor-starting switch is tested at 6 times the full motor load current corresponding to the hp rating marked on the switch For DC motor load controllers, the test is made at 10 times the full motor load current corresponding to the DC hp rating marked on the switch
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Wall-mounted incandescent lamp dimmers are available in at least four different styles, and fluorescent lamp dimmers, low-voltage lighting, and fan controls are available in three of these styles:
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Rotary dimmers Slide-action dimmers Toggle dimmers Digital dimmers
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Incandescent lamp dimmers are wall-mounted devices that include a triac, which functions like two silicon controlled rectifiers (SCRs) in parallel As a result, a triac can control DC or full-wave AC When full-wave AC is applied across the triac terminals, positive and negative gate pulses can control the turn-on time of anode-tocathode current By delaying the application of the gate pulses, both load current and power can be reduced Delays in positive and negative gate pulses chop or delete the fronts of both positive and negative half-cycles of the sinusoidal waveform This results in a narrowed waveform that reduces the current and therefore power to the load Delays in application of gate pulses can reduce load current from about 95 to 5 percent of full value The distorted waveform resembles a series of positive and negative square waves which introduce step functions to the load Resistive incandescent lamp loads can tolerate these waveforms, but inductive loads including motors and fluorescent lamp ballasts can be damaged by them The chopped waveforms cause coils or windings to overheat
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Dimmers are not, as is widely believed, variable resistors or rheostats Any rheostat capable of controlling 120/240 V AC would be too large and heavy to fit in a standard box Even if it were housed in a larger metal box, it would dissipate enough power as heat to be a fire hazard The delay in gate pulses in incandescent lamp dimmers is adjusted by turning a knob on a rotary switch, which moves a wiper on a slide switch If the knob is in its OFF position, the triac turns on early in the AC cycle, allowing nearly full current to be sent to the lamp so it shines brightly By adjusting the knob, the gate pulses can be delayed and the lamp is dimmed The dimming range is set by the dimmer circuitry (See also the discussion of triacs in Chap 3) Heat dissipation occurs with triac-based dimmers, but it does not present a problem as it would be with a rheostat Triac-based dimmers are equipped with metal heat sinks to dissipate any heat built up within their metal device boxes Although a dimmer can replace a single-pole wall switch in a standard device box, a larger device box is usually recommended Dimmer switches have larger bodies than standard switches, and the extra space in the box assures more air circulation for heat dissipation Fluorescent lamp dimmers control the ballasts of fluorescent and low-voltage luminaires The two basic types of dimming ballasts are magnetic and electronic Magnetic dimming ballasts are step-down transformers that present inductive loads, while electronic dimming ballasts include internal solid-state circuitry, so they are not strictly inductive Dimmers designed for fluorescent and low-voltage lighting systems are rated for specific magnetic or electronic ballasts These dimmer circuits must be compatible with the ballast recommended by the lamp manufacturer, and they should not be used for any other type of fluorescent ballast It is important that incandescent lamp dimmers not be used to control standard fluorescent lamps, low-voltage lighting, or fan speed because of the potentially destructive effect of the chopped output waveforms from their triac control circuits However, some compact fluorescent lamps (CFLs) can be controlled by them Precautions should also be taken to be sure that receptacles are not controlled by incandescent lamp dimmers because of the possibility that fans, vacuum cleaners, power tools, and other motor loads might be plugged into them and damaged Fan speed controls: There are two types of wall-mounted fan speed controls, fully variable (full-range) and step control Both types of controls can be used on conventional ceiling paddle fans, regardless of the number of speeds the fan has Fan speed is set on its highest setting when the speed control is installed so that it can be varied through its entire speed range Fan manufacturers often recommend that specific controls be used with their products Residential fan speed controls for 120 V AC, 60 Hz have ratings from 15 to 5 A, and commercial-grade units have ratings to 10 A
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