How is a 4-wire rubber cord used with trolleys?
What will be an ideal response?
The trolleys have six graphite bronze shoes. These shoes make contact with the busbars and provide a path that continues through the fuse cutout and receptacle to the heavy-duty, 4-wire rubber cord. This cord is used to attach the various portable tools such as electric drills, buffers, grinders, and other equipment to the busway system. The 4-wire rubber cord provides three conductors to operate the 3-phase portable tools used on the job. The fourth conductor (green in color) is used to ground the equipment. One end of the grounding conductor must be attached securely to the trolley, and the other end to the housing of the portable tool. The cord must be approved for heavy-duty usage and may be a type SJ containing 12 AWG conductors. The fuses in the trolley are rated at 20 amperes.
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Problem 1.54 Solve Prob. 1.53, assuming that the structure has been redesigned to use 12-mm-diameter pins at B and D and no other change has been made. Problem 1.53 In the steel structure shown, a 6-mm-diameter pin is used at C and 10-mm-diameter pins are used at B and D. The ultimate shearing stress is 150 MPa at all connections, and the ultimate normal stress is 400 MPa in link BD. Knowing that a factor of safety of 3.0 is desired, determine the largest load P that can be applied at A. Note that link BD is not reinforced around the pin holes.
The average age to wean a foal is between ____ months.
A. 2 and 3 B. 4 and 6 C. 5 and 7 D. 6 and 8
Forces in pneumatic and hydraulic systems are usually ____.
A. nonexistent B. very high C. very low D. electrical
What is the purpose of the heat anticipator in a room thermostat?
What will be an ideal response?