When working with high voltages the following precautions should be observed:
a. Access should be locked, allowing only authorized personnel to enter
b. remove all grounding straps before proceeding with the work
c. only allow workers from the utility to work on the equipment
d. stay well within the safe limits of approach
e. make sure the voltages are safe before contacting live conductors
Answer: A
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Power Engineering Chapter 83
- An automatic transfer switch will switch over when the voltage falls below __% of rated and will return automatically upon a resumption of service.
- ___ are used to select alternate circuits
- The branch circuit amperage capacity may range from __ to __ Amperes?
- Circuits which extend beyond the final overcurrent device are termed?
- Beyond the first protective device the __ form the distribution network to the last protective devices which protect the branch circuits.
- ___ provides an enclosure for the distribution and control of the feeders as well as switching and protection of the service.
- Which diagram illustrate the locations and markings of each terminal and the interconnection that is required?
- Which diagram indicates by means of single lines and simplified symbols the distribution of electrical systems in a multistoried structure?
- Which diagram displays the relative physical arrangement of components, including all wiring and connections?
- The actual ratings on devices selected for nominal system supplies are about __ lower, to account for any voltage drop of the supply system.
- A 120 V system is best described as a:
- A 120/240 V system is best described as a:
- The utility's responsibility will not go beyond the
- A prime factor in determining the voltage to be used in a circuit is
- Choose the statement that is FALSE. In an electrical system the neutral wire:
- Low voltage systems may have an actual voltage variation of plus or minus:
- An electrical distribution system is composed of service, feeders and:
- Low voltages include all voltages between _____ V.
- Extra low voltages include all voltages below _____ V.
- When working with high voltage systems, the minimum distance of approach should be not less than:
- The best type of diagram for showing supply and distribution system is the _____ diagram.
- Tie breakers are used to:
- The ability of an electrical circuit to store a charge of electricity even after the circuit is opened is termed:
- High voltages include all voltages above _____ V.
- A 120/208 V system is best described as a: