Which of the following are defined by the NEC® as separate portions of a conduit that provide access through a removable cover to the interior of the system at a junction of two or more sections?
a. Conduit bodies
b. Junction boxes
c. Pull boxes
d. Entrance ells
a. Conduit bodies
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Four fair coins are flipped. Each coin tail is recorded as a 0 and a head as a 1 and the source symbol is the sum, with X1 corresponding to sum =0, X2 to sum = 1, etc. The probability of the source producing X3 equals _______.
Fill in the blank(s) with the appropriate word(s).
A backflow preventer (BFP) is required for which of the following? Select all that apply.
A) Mechanical makeup line. B) Branch takeoff to a bank of water closets. C) Irrigation system.
Besides improving efficiency, insulating the suction line:
A) Prevents stray electrical current from traveling down the pipe. B) Prevents moisture from condensing on the line. C) Serves as a backup sealing system to prevent refrigerant loss. D) Reduces mechanical vibrations set up by the compressor.
The phase current of a delta wound 3 phase motor is:
A) 1.5 times the line current. B) Equal to the line current. C) 3 times the line current. D) 1.73 times the line current.