Article 250
24 Questions 
​View all pages and complete test at the bottom of page 
Multiple Choice Quiz Question: 10 Points

1. Definition of a Bonding Jumper, Supply-Side. (BJSS)
 A conductor installed on the _________side of a service or within a service equipment enclosures, or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected.  











Multiple Choice Quiz Question: 10 Points

2. Ungrounded systems shall be legibly marked “Ungrounded System” at the source or _________________ of the system.










Multiple Choice Quiz Question: 10 Points

3. A grounding electrode conductor shall be used to connect the equipment grounding conductors, the service-equipment enclosures, and, where the system is grounded, the grounded service conductor to the grounding electrode. This conductor shall be sized in accordance with Article __________











Multiple Choice Quiz Question: 10 Points

4. In addition, for sets of ungrounded service-entrance conductors larger than 1100 kcmil copper the grounded conductor shall not be smaller than _________ of the circular mil area of the largest set of service-entrance ungrounded conductor













Multiple Choice Quiz Question: 10 Points

5. Which of the following is true about Article 250.30 A 


  . 








Multiple Choice Quiz Question: 10 Points

6. If the source of the separately derived system is located outside the building or structure supplied, a grounding electrode connection shall be made at the ___________________.











Multiple Choice Quiz Question: 10 Points

7. 250.32 B 1.The following conditions under which a grounded conductor is permitted to serve as a ground-fault return path. 











Multiple Choice Quiz Question: 10 Points

8. An equipment grounding conductor, as described in 250.118, _______ run with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode.







Multiple Choice Quiz Question: 10 Points

9. A metal underground water pipe in direct contact with the earth for _____ or more can be used as a grounding electrode 












Multiple Choice Quiz Question: 10 Points

10. At least one structural metal member that is in direct contact with the earth for ____ or more can be used as a grounding electrode .










Multiple Choice Quiz Question: 10 Points

11. The hold-down bolts securing the structural steel column shall be connected to the concrete-encased electrode by :










Multiple Choice Quiz Question: 10 Points

12. A concrete-encased electrode shall consist of at least











True/False Quiz Question: 10 Points

13. Concrete installed with insulation, vapor barriers, films or similar items separating the concrete from the earth is not considered to be in “direct contact” with the earth.







Multiple Choice Quiz Question: 10 Points

14. A single rod, pipe, or plate electrode shall be supplemented by an additional electrode unless 











True/False Quiz Question: 10 Points

15. 250.53 You can no longer install just one ground rod unless you can show the ground rod has 25 ohm or less.







Multiple Choice Quiz Question: 10 Points

16. If multiple rod, pipe, or plate electrodes are installed to meet the requirements of this section, they shall not be less than ____ apart.










True/False Quiz Question: 10 Points

17. Grounding electrode conductors shall be permitted to be installed on or through framing members.







Multiple Choice Quiz Question: 10 Points

18.If a service consists of more than a single enclosure as permitted in 230.71 A, grounding electrode connections can be made with a_____________ 









Multiple Choice Quiz Question: 10 Points

19. Interior metal water piping located not more than _____ from the point of entrance to the building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system.












Multiple Choice Quiz Question: 10 Points

20.  250.92 Standard locknuts or bushings________ be the only means for the bonding required by this section but shall be permitted to be installed to make a mechanical connection of the raceways.







Multiple Choice Quiz Question: 10 Points

21.  250.102 Supply Conductors in a Single Raceway or Cable. The supply-side bonding jumper shall not be smaller than the sizes shown in ________________ for grounding.












True/False Quiz Question: 10 Points

22.  250.121 An equipment grounding conductor shall not be used as a grounding electrode conductor.








Multiple Choice Quiz Question: 10 Points

23.  Equipment grounding conductors of the wire type copper shall not be smaller than________ for a 40 amp circuit .
​     Table 250.122  in code book












Multiple Choice Quiz Question: 10 Points

24.  Article 440 allows a 40 amp breaker with # 12 copper wire to feed a 20 amp motor , according to table 250.122 what size equipment ground wire do you use ? ( in code book ) 2008  or 2011











Test cannot be saved you must complete and submit
use drop down box to choose correct answers
Name
license #
Comments
You must have your name , license #  on this form to get credit. 
supply
between equipment
Load
First means of disconnect
Feeder Panel
Load side
First disconnecting means
none of these
250.122 ​
250.102 ​
250.66 ​
250.4
3/0 copper​
500 kcm copper
12½ percent ​
none of these
prohibit connection of a grounded conductor to ground on the load side of system bonding jumper. ​
Allows connection of a grounded conductor to ground on the load side of system bonding jumper.​
State that a equipment ground can connect to the supply side of a separately derived system.​
All of the above.​
Services Main​
the source location ​
Equipment ground ​
none of these
An equipment grounding conductor is not run with the supply to the building or structure.​
There are no continuous metallic paths bonded to the grounding system in each building or structure involved.​
Ground-fault protection of equipment has not been installed on the supply side of the feeder​
All of these​
Shall be
Shall not be
5 ft.​
20 ft.​
10 ft.​
cannot not be used
10 ft. ​
20 ft. ​
5 ft.​
none of these​
steel tie wires ​
exothermic welding ​
other approved means ​
all of these​
20 ft. one or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars 1/2 in.​
20 ft. of bare copper conductor not smaller than 4 AWG ​
20 ft. of several ½ reinforcing bars tied wire together .​
All of these​​
true
false
has a resistance to earth of 25 ohms or less ​
connected to the service​
AHJ does not require it. ​
none of these​
true
false
6 ft. ​
twice the length of the rod ​
10 ft. ​
20 ft.
true
false
a lug large enough for all wires ​
Copper busbar ¼ in. × 2 in. ​
splice or joints ​
cannot tap.
10 ft. ​
20 ft.​
5 ft. ​
2 ft.
Shall
Shall not
Table 250.122 ​
Table 250.102 ​
table 250.66​
Table 314​
true
false
#10 copper ​
#14 copper​
#10 aluminum​
#12 copper
#10 copper ​
#14 copper​
#10 aluminum​
#12 copper