Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Grounding and Bondg
Grounding and Bonding Review
| Question | Answer |
|---|---|
| If electrical equipment or systems are grounded, the ___________ is in the circuit and part of the electrical system | Earth |
| Def: Connected to a ground or to a conductive body that extends the ground connection | Ground |
| Bonded: connected to establish ___________________ continuity and conductivity | Electrical |
| Bonding minimizes ________________ differences between conductive parts that are bonded together. | potential |
| Bonding is a function that results in non _____________ carrying conductive parts being connected together electrically, establishing continuity between them and in many instances adequate conductivity for current | current |
| Grounding and Bonding are two protective processes. These two processes not only provide essential protective functions for equipment and property, but also _________________ shock hazards. | reduce pg 5 lesosn 1 |
| To understand electrical grounding concepts and performance, getting back to basics is necessary. ___________________ is a function of connecting to Earth. | Grounding |
| When an object qualifies as a grounding electrode any connection to it renders a _______________ function | grounding |
| Connected to establish electrical continuity and conductivity. | Bonded |
| ____________ is a function that result in non-current carrying parts being connected together electrially establishing continuity between them. | Bonding |
| Bonding ____________________ potential differences between parts while possibilities for electric shock. minimizes or increase | minimizes |
| System and equipment grounding can limit voltages imposed by lightening, line surges, and unintentional contact with higher voltage systems. TF | True |
| 250.68 (A) states: All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be _____________________ | Accessible Exception No. 1: An encased or buried connection to a concrete-encased, driven, or buried grounding electrode shall not be required to be accessible. |
| According to the NEC Style Manual, the phrase “likely to become energized” is best described by which of the following? a. Failure of insulation on b. Will become energized at some point in time c. Will not cause a fuse to open d. Will not trip a circuit breaker | Failure of insulation on |
| Where concentric, eccentric, or oversized knockouts are encountered in circuits over 250 volts phase to ground, one of the bonding methods in Section 250.92(B)(2) through (4) must be applied to ensure the required continuity and conductivity. TF | True |
| #27 lesson 7: What is the minimum-size copper bonding jumper required for an interconnected exposed structural metal if the service is rated 1,000 amperes and supplied by two parallel 600 kcmil copper conductors for each ungrounded service phase conductor? | 3/0 AWG 250.66 |
| Where a building or structure is supplied by a feeder or branch circuit, the bonding jumper to the metal water piping system(s) is required to be sized according to ? , based on the size of the feeder or branch circuit that supplies the building or structure. | Table 250.102(C)(1) |
| Where a feeder supplies a separate building or structure, and a metal frame of that structure must be bonded, what NEC table is used to size the bonding jumper? | Table 250.102(C)(1) |
| When a gas furnace is supplied by a 30-ampere branch circuit, what is the minimum size bonding conductor or jumper required for bonding the metal gas piping system? | The correct answer is: 10 AWG copper Note: Refer students to 250.104(B), where the bonding for the gas piping system can be accomplished using the branch circuit equipment grounding conductor for the circuit supplying the equipment. Also point out that Informational Note No. 2 refers users to additional bonding requirements that are provided in Section 7.13 of NFPA 54, National Fuel Gas Code. The question asks for the minimum, and the type of gas piping system is not provided in the question. |
| Which of the following tables is used to size bonding conductors or jumpers for interior metal water piping systems? | Table 250.102(C)(1) |
| What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has a large ungrounded service entrance conductor size of 2,500 kcmil? | The correct answer is: 350 kcmil Note: 2,500 kcmil x 12.5% = 312,500 kcmil round up to the next standard available size is 350 kcmil based on Table 8, Chapter 9 and Table 250.102(C)(1). |
| The insulated EGC connected to an isolated grounding-type receptacle is permitted to pass through one or more panelboards or other enclosures without a grounding connection as long as it terminates at the grounding point at the ? . | applicable service or separately derived system 250.146 |
| An effective path for ground-fault current is required for the normal equipment grounding conductor (dirty ground) of a branch circuit and the isolated/insulated equipment grounding conductor (clean ground) of the circuit. TF | True |
| Auxiliary grounding electrodes are permitted to be installed for special information technology equipment covered in Article 645, and the ? must always be connected to the equipment. | equipment grounding conductor |
| Equipment grounding conductors are the conductive path(s) installed to connect normally__________________carrying metal parts of equipment together and to the system__________________conductor or to the grounding electrode conductor, or both | non current/grounded |
| Which NEC table is used to establish the minimum size required for wire-type equipment grounding conductors? | Table 250.122 |
| System and equipment grounding can limit voltages imposed by lightening, line surges and _______________ contact with higher voltage lines. | unintended |
Created by:
Shawnt321