5.a. The labor performed when you extend an existing electrical system is called A. old work. B. repair work. C. troubleshooting D. faultfinding. 5.b. The basement in an existing building has concrete walls, a concrete floor, and a concrete ceiling. From this information, you know that receptacles, lamp fixtures, and switches A. can't be installed in this basement as there is no way to ground the circuit. B. won't require ground-circuit protection because concrete insulates the occupants from ground. C. can be installed in the basement and circuit wiring enclosed in a surface raceway system. D. can only be installed if they're connected with armored cable.

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.