Grounding and Bonding
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| To qualify as an electrode, a water pipe must be in contact with the earth for at least _____ feet. | 10'
250.52(A)(1)
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| When using a water pipe as an electrode you must connect to it within _____ feet of where the water pipe enters the building. | 5' feet
250.66(C)(1)
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| Structural steel may be used as an electrode if it is in contact with the earth for at least ______ feet. | 10' feet
250.52(A)(2)
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| A ground ring must consist of at least ______ feet of #_____ bare copper and must be buried at least _____ deep. | 20'
#2
30" 250.52(A)(4) and 250.53(F)
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| A concrete encased electrode must consist of at least ____ feet of ____ inch rebar, or #_____ bare copper. | 20' feet
1/2" inch
#4 250.52(A)(3)
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| A rod or pipe electrode must consist of ____ feet of at least ______ pipe or ____ inch rod unless listed or other diameters. | 8' feet
3/4
5/8" 250.52(A)(5)
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| Plate electrodes must have at least ____ square feet of surface area and must be buried at least ____" deep. | 2 square feet
30" 250.52(A)(7) 250.53(H)
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| Rod or pipe electrodes must be supplemented by another electrode UNLESS the resistance to ground is not over ____ ohms. | 25 ohms 250.53(A)(2) exc
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| If a ground rod is supplemented by another ground rod you must space them at least ____ feet apart. | 6' feet
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| The only electrode that must always be supplemented _______ ________ electrode. | water pipe
250.53(D)(2)
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| If solid rock is encountered, you may lay a ground rod down in a trench that is at least _____ deep. | 30" inch
250.53(G)
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| Underground ____ piping or ___________ ground rods may not be used as electrodes. | gas
aluminum 250.52(B)
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| If using aluminum for the GROUNDING ELECTRODE CONDUCTOR it must not be terminated to the elctrode within _____ inches of the earth when outside. | 18" inches 250.64(A)
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| What size copper Grounding Electrode Conductor is required for a service that uses aluminum 800 kcmil conductors for the phases? Water pipe electrode. | 1/0 T 250.66
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| A service uses three 4/0 copper conductors in parallel for each phase. What size copper grounding electrode conductor is required to the water pipe electrode? | Table 8 Chapter 9
4/0 = 211600 x 3 = 634,800 cm = 2/0
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| What is the maximum size Copper Grounding Electrode Conductor ever required to be run to a water pipe no matter how large the service conductors are? | 3/0 T 250.66
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| No matter what the service size, the largest copper Grounding Electrode Conductor ever required to a driven ground rod, pipe, or plate electrode is _______. | #6 copper AWG 250.66(A)
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| No matter what the service size, the largest copper Grounding Electrode Conductor ever required to a concrete encased electrode is __________. | #4 copper AWG 250.66(B)
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| What size copper Main Bonding Jumper is required for a service that uses 500 kcmil copper conductors for each phase? | 1/0 Table 250.102(C)(1)
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| What size copper Main Bonding Jumper is required for a service that uses six 400 kcmil copper conductors per phase? | 300 kcmil
6 x 400 kcmil = 2400 kcmil x .125 = 300 kcmil
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| Table 250.102(C)(1) is used for sizing the _________ conductor, the _____ bonding jumper, the _________ bonding jumper, and ________ _________ bonding jumpers. | grounded, main, system, supply side
Table 250.102(C)(1)
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| Equipment grounding conductor sized ____ and smaller must be green or bare their entire length. | #6 250.119(A)(1)
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| Flexible metal raceway may not serve as an equipment grounding path if the total length is over _____ feet. | 6' feet 250.119(A)(1)
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| What minimum size copper equipment grounding conductor is required for a 60 amp branch circuit? | #10 Table 250.122
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| What minimum size copper equipment grounding conductor is required for a 600 amp branch circuit? | #1 AWG Table 250.122
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| When running conductors in parallel, must the equipment grounding conductor be installed in each parallel raceway? | yes 250.122(F)
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| When installing a service raceway, an underground metal elbow installed in a run of PVC need not be grounded as long as it is buried at least _____ inches deep. | 18" inches 250.80 ex
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| Must the equipment grounding conductor run to a pump motor also be connected to the metal well casing? | Yes, "The Earth shall not be considered as a ground fault path"
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| Frames of household ranges and dryers may only use the grounded neutral conductor for equipment grounding purposes for _______ circuits. | existing 250.140 ex
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| The grounded conductor may be used to ground exposed metal parts only on the ______ side of the service disconnect. | line 250.142
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| If a ferrous metal raceway is used to protect the GEC, it must be bonded to the GEC at ______ end(s). | both 250. (E)(1)
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| Standard locknuts may not be used for bonding purposes at the ________. | service 250.92(B)
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| A locknut on an EMT connector is not considered to be adequate bonding if you encounter concentric knockouts AND the voltage is over ______ to ground. | 250V 250.96
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Created by:
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