Chapter 9 Exercises
Exercises
- What wiring technique should be used when running AC near to or on top of low-voltage DC signal wiring?
- What is the minimum AC voltage that will register a 1 or ‘on’ for an Allen-Bradley 1746- IA16 card? (look-up on A-B’s website)
- What is the value of a resistor needed to drain all the leakage current from an Allen- Bradley 1746-OA16 card with VAC = 120? What is the wattage of the resistor?
- What special precautions must be used for handling analog cable inside a control panel?
- What or who is an AHJ?
- From a manufacturer’s catalog, look at the specifications for a relay and find the following:
- Coil Voltage:
- Contact Rating:
- Motor Rating (find at least one with this rating):
- Number of normally open contacts:
- Number of normally closed contacts:
- Extra features:
- Cost:
- Why wouldn’t the submarine submerge?
- Why isn’t it a good idea to settle for Category 4 PPE?
- What color push button is associated with “Emergency stop, stop, off”?
- List the elements of an Arc Flash panel tag.
- What three documents are primarily used in determining the design of a control panel? How do the three differ?
- Are all class 2 control circuits safe, i.e. there is no need to provide arc-flash rules for the panel?
- Why is a distributed system advantageous over a central large control panel?
