CEA DHTI Plus Digital Home Technology Integrator All In One by Ron Gilster, Helen Heneveld

By Ron Gilster, Helen Heneveld

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Cancellation C. Crosstalk D. Interference 10. What is the common used term that describes a bundled cable with two runs of UTP and two runs of coaxial cable? A. UC cable B. Structured bundle C. 2+2 D. 2+2+2 Answers 1. C. Because they are wireless communication circuits, these systems are not part of a house’s wiring structure. 2. B. A conductor has the ability to store and release an electrical current. 3. A. Modern nonmetallic (NM) or Romex cable is the currently accepted standard for general household electrical wiring.

A low-voltage lighting circuit that includes 120V to 12V transformers to drive 12V lamps is an example of a power-limited circuit. Power-limited circuits are limited to 30V. Low-Voltage Classes Low-voltage circuits are separated into four circuit classes, as listed in Table 1-2. 5, but not more than 100 VA Table 1-2 Low-Voltage Circuit Classes signaling. Class 2 and 3 circuits are commonly found in residential wiring. A few examples of Class 2 circuits are low-voltage lighting controls, thermostats, security systems, intercoms, audio systems, and computer networks.

S. electrical plug Plug As shown in Figure 2-6, the standard three-contact electrical plug is commonly attached to the power cord of virtually all electrical appliances, control systems, and power supplies in North America. Lamps and other low-voltage devices use only a two-contact plug. There are several types of electrical plugs used in the United States, with different plugs used for different applications. Around the world, electrical plug patterns, shapes, and sizes vary by country and region (see the next section, “Electrical Plugs”).

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