A well-house strip heater connected to a 240-volt circuit measures 16 ohms. Using Ohm’s law, what is the current?
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Question · Easy
14 on 15, 12 on 20, 10 on 30
Short
A 230-volt, single-phase well-pump motor draws its Table 430.248 full-load current of 8 amperes. What is the apparent power of that motor circuit?
Question · Medium
Under NEC Article 100, a continuous load is a load where the maximum current is expected to continue for how long?
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NEC Article 100 defines “in sight from” (within sight from) as visible and not more than what distance from the other equipment?
A 120/240-volt well-house panelboard faces a wooden wall with no live or grounded parts opposite the enclosure. What minimum working-space depth does NEC Table 110.26(A)(1) require?
Except as permitted by the exceptions in NEC 110.26(A)(3), what is the minimum headroom of working space about a well-house panelboard?
A 480Y/277-volt well-field control panel faces a concrete wall. What minimum working-space depth does NEC Table 110.26(A)(1) require?
NEC 110.9 requires equipment intended to interrupt current at fault levels to have an interrupting rating sufficient for which of the following?
A listed submersible pump is supplied with installation instructions that specify a particular drop-cable type. What does NEC 110.3(B) require?
Under NEC 90.5, which word identifies a mandatory Code rule?
According to NEC 90.3, which statement about Code arrangement is correct?
A 100-ampere well-house feeder lands on a panelboard whose terminals are not marked for 75°C. For termination temperature, which ampacity column must be used under NEC 110.14(C)(1)?
For indoor electrical equipment, dedicated equipment space required by NEC 110.26(E)(1)(a) extends from the floor to what height above the equipment, or to the structural ceiling, whichever is lower?
Question · Hard
Under NEC 110.26(C)(2), large equipment that contains overcurrent, switching, or control devices must have an entrance to the working space at each end when which condition exists?
NEC 110.12 requires electrical equipment to be installed in a neat and workmanlike manner. Which condition is specifically identified as a Code violation of unused openings?
What is the purpose of the NEC as stated in 90.1(A)?
NEC 210.19(A)(1) requires branch-circuit conductors to have an ampacity not less than the maximum load to be served and not less than the rating of the branch circuit where they supply more than one receptacle for cord-and-plug-connected portable loads. For a single well-pump motor branch circuit, conductor ampacity is also governed by which rule?
Feeders And Branch Circuits
A well-house feeder supplies a 12-ampere continuous heater load and an 8-ampere noncontinuous receptacle load. Before applying any motor rules, what minimum feeder ampacity does NEC 215.2(A)(1) require for those two loads?
What is the minimum ampacity required by NEC 430.22 for the branch-circuit conductors of a 5-horsepower, 230-volt, single-phase, continuous-duty well-pump motor?
A feeder supplies two 230-volt, three-phase well-pump motors that may run at the same time: 10 horsepower and 5 horsepower. What minimum feeder ampacity does NEC 430.24 require for the motor loads?
Informational Note No. 2 to NEC 215.2(A)(1) recommends that the voltage drop on a feeder, and the combined voltage drop on feeder plus branch circuit, not exceed which pair of values at design load?
A 230-volt, single-phase well pump draws 28 amperes. The one-way run is 200 feet of copper. Using VD = 2 × K × I × D / CM with K = 12.9 and 10 AWG = 10,380 circular mils, what is the approximate voltage drop?
A well-house branch circuit supplies a 16-ampere continuous heater and a 4-ampere noncontinuous load. What is the minimum standard inverse-time breaker rating permitted by NEC 210.20(A) and 240.6(A) for those loads?
A feeder from a dwelling supplies a detached well house. Under NEC 225.31, what is required for that feeder?
Which of the following is a standard ampere rating listed in NEC 240.6(A)?
Overcurrent Protection
Unless specifically permitted in 240.4(E) or (G), what is the maximum overcurrent protection for a 12 AWG copper conductor under NEC 240.4(D)?
Using NEC Table 430.52, what is the maximum inverse-time circuit-breaker rating for a 5-horsepower, 230-volt, single-phase well-pump motor before applying the next-size exception?
Using NEC Table 430.52 and 430.52(C)(1) Exception No. 1, what is the maximum dual-element (time-delay) fuse rating for a 5-horsepower, 230-volt, single-phase well-pump motor?
A 3-horsepower, 230-volt, single-phase jet-pump motor is protected by an inverse-time circuit breaker. Table 430.248 FLC is 17 amperes. What is the maximum standard breaker rating permitted by Table 430.52 and 430.52(C)(1) Exception No. 1?
NEC 240.4(B) permits the next higher standard overcurrent-device rating when the conductor ampacity does not correspond to a standard size, provided the circuit is rated not more than how many amperes?
A submersible pump is installed in a metal well casing. What does NEC 250.112(M) require?
Grounding And Bonding
NEC 250.112(L) specifically requires the non–current-carrying metal parts of which equipment to be grounded?
What is the minimum size copper equipment grounding conductor required by NEC Table 250.122 for a 20-ampere well-pump branch circuit?
What is the minimum size copper equipment grounding conductor required by NEC Table 250.122 for a 60-ampere well-pump circuit?
A 5-horsepower, 230-volt, single-phase submersible pump is protected by a 70-ampere inverse-time breaker. What is the minimum copper equipment grounding conductor, and well-casing bond, required by Table 250.122?
What is the minimum size copper equipment grounding conductor required by NEC Table 250.122 for a 200-ampere feeder to a well house?
NEC 250.52(A)(1) recognizes a metal underground water pipe as a grounding electrode when it is in direct contact with the earth for not less than 10 feet. The rule expressly includes which well-related item?
NEC 250.52(A)(8) lists which of the following as a permitted grounding electrode?
When a metal underground water pipe is used as a grounding electrode, NEC 250.53(D)(2) requires which additional action?
A well service uses 2/0 AWG copper ungrounded service-entrance conductors. What is the minimum copper grounding electrode conductor required by NEC Table 250.66?
A well service uses 4/0 AWG copper ungrounded service-entrance conductors. What is the minimum copper grounding electrode conductor required by NEC Table 250.66?
An 8 AWG copper grounding electrode conductor is run on the surface of a well house to a ground rod. What does NEC 250.64(B) require?
A 20-ampere well-pump circuit would be served by 12 AWG copper ungrounded conductors, but voltage drop requires those conductors to be increased to 8 AWG copper. What is the minimum copper equipment grounding conductor under NEC 250.122(B)? (12 AWG = 6,530 cmil; 8 AWG = 16,510 cmil.)
NEC 250.4(A)(5) requires electrical equipment, wiring, and other electrically conductive material likely to become energized to be installed so that a permanent, low-impedance circuit is created that is capable of which of the following?
A detached well house is supplied by a feeder from a dwelling. Under NEC 250.32, which grounding arrangement is generally required?
A 200-ampere well service uses 2/0 AWG copper ungrounded conductors. The only grounding electrode is a ground rod. What is the largest copper grounding electrode conductor required by NEC 250.66(A)?
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