Describe circuit breaker connections on a typical panelboard.
What will be an ideal response?
The incoming service entrance cable connects to the neutral bus bar and the main circuit breaker. The main controls the flow of power from the utility into the service panel. The white wire is neutral and connects to the neutral bus bar. The red and black wires connect to the main and through it to the snap-on connections for the circuit breaker. The circuit breakers control the power to each circuit.
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Identify the major components of a kettle reboiler.
What is the temperature differential across the shell side of Ex-202?
What will be an ideal response?
Explain the two compartments on a non-datum related control.
What will be an ideal response?
1. The sequencer instruction transfers information from memory words into output words. 2. Some PLCs allow the data to be entered using hexadecimal, which speeds the entry process. 3. Allen-Bradley uses a hexadecimal number that represents the bit pattern that is desired by the mask for screening information, or data, from the sequencer file. 4. An SQM instruction allows data to be loaded into a sequencer file from a source address on each false-to-true transition. 5. The Done Bit (DN) is set when the last word of the sequencer file has been transferred into the destination word.
Fill in the blank(s) with the appropriate word(s).