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422.4 Worksheet Questions and Answers Fully Solved
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Exam of 1 pages for the course IEC at IEC (422.4 Worksheet)
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422.4 WorksheetIn judging equipment, considerations such as the following shall be evaluated.
I. mechanical strength
II. cost
III. arcing effects
IV. guarantee - answer I & III only
Conductors shall be ___ unless otherwise provided in the Code. - answer copper
Conductor sizes are given in AWG or ___. - answer circular mils
Equipment intended to interrupt current at fault levels shall have an interrupting rating at
nominal circuit voltage sufficient for the current that is available ___. - answer at the line
terminals of the equipment
Unless identified for use in the operating environment, no conductors or equipment shall
be located in ___ having a deteriorating effect on the conductors or equipment.
I. damp or wet locations
II. where exposed to gases, fumes, vapors, liquids, or other agents - answer both I and
II
Electric equipment shall be installed in a neat and ___ manner. - answer workmanlike
How would you seal unused knock-outs in panels and boxes? - answer metallic plugs or
plates
___ plugs driven into holes in masonry, concrete, plaster, or similar materials shall not
be used. - answer Wooden
Connection by means of wire-binding screws or studs and nuts having upturned lugs or
equivalent shall be permitted for ___ AWG or smaller conductors. - answer10
Soldered splices must be ___ so as to be electrically secure before soldering. - answer
joined mechanically
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