Answer the following statement(s) true (T) or false (F)
1. The work of the modern electrician requires a knowledge of National Electrical Code® requirements that govern three-phase motor installations and the ability to apply these requirements to installations.
2. NEC® Article 430.52 Exception 1 states that if the values for branch-circuit protective devices as determined using the percentages in Table 430.52 do not correspond to the standard device sizes or ratings, then the nearest smaller size rating or setting should be used.
3. When the conductors of a feeder supply two or more motors, the required wire size is determined using Code rules.
4. Wire types and sizes are selected by the ambient temperatures of the place of installation and the economics of the total installation, such as the minimum size of conduits, cost of the wire sizes, and labor cost for installing the various selections.
5. The NEC® guides an electrician through the main components of the calculation, thus providing all the information that is necessary for a motor installation.
1. TRUE
2. FALSE
3. TRUE
4. TRUE
5. FALSE
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Generally, mechanically held relays are available in 10- and ____-ampere sizes.
a. 12 b. 15 c. 20 d. 24
A rigid coupling is used:
a. to allow the motor to accelerate to full speed before the load is increased. b. in applications where small amounts of misalignment can be tolerated. c. to cushion the shock from equipment overloads. d. more frequently in general power transmission service and permits some misalignment.
Turf areas should be separated from other plantings and irrigated separately
Indicate whether the statement is true or false
To unload a reciprocating compressor, hot gas bypass across the cylinder is the best method.
Answer the following statement true (T) or false (F)