Which of the following statements about metal in-ground structural support grounding electrodes is not true?
A. It is considered a grounding electrode if one or more of the steel members is in direct
contact with the earth for 10 ft (3.0 m) or more.
B. It is considered a grounding electrode if 10 ft (3.0 m) or more of one or more of the
steel members is encased in concrete that is in direct contact with the earth.
C. It is an above-ground metal frame that is bonded to a concrete-encased grounding
electrode.
D. It is considered a grounding electrode if a steel column is driven into the ground 6 ft
(1.8 m) to hardpan.
D. It is considered a grounding electrode if a steel column is driven into the ground 6 ft
(1.8 m) to hardpan.
You might also like to view...
In determining the fire rating of an assembly through laboratory testing, an important criterion to meet is that it should maintain its structural integrity for the duration of its fire rating. What other criterion/criteria should the assembly satisfy during that duration?
What will be an ideal response?
Two types of floor plans are possible in multistory, load-bearing wall structures: (i) cross-bearing wall plans and (ii) longitudinal-bearing wall plans. Which of these two is more amenable to providing large openings in exterior walls and which one gives large interior open spaces?
What will be an ideal response?
List two typical uses of autotransformers.
What will be an ideal response?
What is the purpose of purging with nitrogen while brazing?
A) To help the flame burn a little hotter B) To check for leaks at the same time you are brazing C) To blow the oxides off the walls before it has a chance to firmly adhere D) To prevent oxide formation inside the pipes