Which of the following underground water pipes is not recognized as a grounding electrode in 250.52(A)(1)?
A. 3?4-in. galvanized in contact with the earth for 22 ft
B. 1-in. copper in contact with the earth for 28 ft
C. 6-in. iron half-wrapped with corrosion-protection tape in contact with the earth for 40 ft
D. 3?4-in. copper in contact with the earth for 12 ft
C. 6-in. iron half-wrapped with corrosion-protection tape in contact with the earth for 40 ft
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For each of the following scenarios, state whether an incremental ROR analysis is required to select an alternative and state why or why not. Assume that alternative Y requires a larger initial investment than alternative X and that the MARR is 20% per year.
(a) X has a rate of return of 22% per year, and Y has a rate of return of 20% per year. (b) X has a rate of return of 19% per year, and Y has a rate of return of 21% per year. (c) X has a rate of return of 16% per year, and Y has a rate of return of 19% per year. (d) X has a rate of return of 25% per year, and Y has a rate of return of 23%. (e) X has a rate of return of 20%, and Y has a rate of return of 22% per year.
A seat belt pretensioner is __________
A) Used to force the occupant back into position against the seat back in the event of a collision B) Used to remove slack from the seat belt in the event of a collision C) A device that contains an explosive charge D) All of the above
A personal fall arrest system should be inspected monthly by a _____.