Entrance cables must be supported within ____ in. of every raceway or enclosure connection.
A. 6
B. 12
C. 18
D. 24
Answer: B
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Electro-mechanical control systems operate by:
A) Turning relay coils on or off to complete circuits. B) Processing electronic signals with a microprocessor. C) Providing a modulating air pressure in response to monitored conditions. D) Providing a varying DC voltage in response to monitored conditions.
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Of the following refrigerant leak detection methods which one would be the most sensitive?
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