| NEC Scope and General Requirements | p. 1 |
| Does the NEC say who can do "low-voltage" work covered by the NEC? | p. 2 |
| Are all broadband installations covered by Article 830? | p. 3 |
| Does the NEC cover wiring on transit buses or trains? | p. 4 |
| Are electrical substations covered by the NEC! | p. 6 |
| What is the difference between wet and damp locations? | p. 7 |
| Does the NEC require listed equipment? | p. 9 |
| Are all switches required to have a short-circuit or interrupting rating? | p. 12 |
| How do terminal ratings affect conductor and ampacity selection? | p. 13 |
| Where can I find information on protective electrical apparel? | p. 17 |
| How are the requirements for working spaces determined? | p. 19 |
| What working spaces apply to HVAC equipment? | p. 26 |
| Are enclosed panels facing each other considered to be "exposed live parts on both sides"? | p. 28 |
| Do transformers require working space for servicing while energized? | p. 30 |
| What clearance is required for equipment that is serviced only while de-energized? | p. 32 |
| Wiring and Protection | p. 35 |
| Is gray permitted for any grounded conductor or just certain voltages? | p. 36 |
| Where is GFCI protection required? | p. 36 |
| What types of devices are permitted for providing AFCI protection? | p. 41 |
| Why must single receptacles match the rating of the circuit but not duplex receptacles? | p. 44 |
| Where are receptacle outlets required in dwelling units? | p. 45 |
| Do unit load values for general lighting include factors for continuous loads? | p. 54 |
| May a building be supplied by sources in addition to a service? | p. 56 |
| How many services are permitted for a building? | p. 58 |
| Are goosenecks permitted to be located below service drop conductors? | p. 62 |
| What size service is required for temporary power for construction? | p. 63 |
| Are "gang-operated" isolating switches required ahead of primary metering equipment? | p. 65 |
| Where is an overcurrent device required to be located in a circuit? | p. 66 |
| May I terminate a grounding electrode conductor in a meter base? | p. 73 |
| What is meant by a "parallel path"? | p. 76 |
| How are grounding electrode conductors sized? | p. 80 |
| Must water piping and steel be bonded where there is no building? | p. 84 |
| Is a lighting pole considered grounded by a direct connection to an electrode? | p. 85 |
| Is metal roofing, siding, and metal veneer required to be grounded or bonded? | p. 87 |
| Where can I find flexible metal conduit that is listed for grounding? | p. 89 |
| Should a service lateral include a grounding or bonding conductor? | p. 91 |
| Is a separate electrode system permitted to establish a "clean ground"? | p. 93 |
| Where must isolated grounding conductors terminate? | p. 97 |
| Is a 250-volt DC system required to be grounded? | p. 98 |
| Wiring Methods and Materials | p. 101 |
| Is wiring restricted from sharing a penetration with plumbing? | p. 102 |
| Is air tubing permitted in a raceway for conductors? | p. 103 |
| Are sleepers laid on a roof adequate for support of exposed raceways? | p. 104 |
| When can raceways or cables be attached to ceiling grids or supports? | p. 105 |
| Must neutrals be pigtailed at devices supplied by multiwire branch circuits? | p. 107 |
| Are receptacles permitted in plenum ceilings? | p. 109 |
| What wiring methods and equipment are permitted in ducts, plenums, and other air-handling spaces? | p. 110 |
| When are solid conductors allowed in raceways? | p. 113 |
| Is a listing number adequate for identifying a manufacturer? | p. 115 |
| What color coding does the NEC require for conductors? | p. 116 |
| Where can I find application information for conductors | p. 119 |
| Do the special conductor sizes for dwellings apply to 208/120-volt, single-phase systems | p. 121 |
| How are ampacity calculations coordinated with termination and continuous load requirements? | p. 123 |
| Do the ampacity tables of Article 310 apply to both AC and DC conductors? | p. 129 |
| What are the differences in requirements for boxes in combustible and noncombustible materials? | p. 130 |
| Are box extensions the only way to shield combustible material at boxes? | p. 132 |
| Where is Type NM cable permitted? | p. 135 |
| When and where is protection required for cables in attics and roof spaces? | p. 138 |
| Do the extended support lengths for RMC apply where three-piece couplings or unions are used? | p. 141 |
| Are aluminum conduits and fittings permitted to connect to steel enclosures? | p. 142 |
| In what occupancies are cable trays permitted? | p. 143 |
| What type of single conductors or multiconductor cables may be used in cable tray? | p. 145 |
| Equipment for General Use | p. 149 |
| Are green or white conductors in flexible cord permitted to be re-identified? | p. 150 |
| Where can I find information on the proper and improper uses of flexible cords and extension cords? | p. 151 |
| Is marking required for GFCI-protected receptacles in new installations? | p. 154 |
| When is a service panel required to have a main overcurrent device? | p. 155 |
| Are luminaires permitted to be connected by a cord and plug? | p. 158 |
| Must a low-voltage lighting system come entirely from one manufacturer? | p. 160 |
| Must all disconnects be readily accessible? | p. 162 |
| Is a pool pump motor treated as an appliance or as a motor? | p. 163 |
| What is the purpose of code letters on motors? | p. 165 |
| How is overcurrent protection provided for motors and motor circuits? | p. 167 |
| Do small motors such as damper motors require local disconnects? | p. 171 |
| When are motors permitted to be connected by a cord and plug? | p. 173 |
| How are conductors sized for motors over 600 volts? | p. 175 |
| May the circuit breaker for an air-conditioning unit also serve as the disconnect? | p. 176 |
| Can a circuit for HVAC equipment be tapped to separate integral circuit breakers? | p. 177 |
| What restrictions does the NEC impose on the locations of transformers? | p. 181 |
| Special Occupancies | p. 187 |
| Where do I find the classification of a hazardous location? | p. 188 |
| Must areas where solvents, fuel oil, or diesel is used be classified? | p. 190 |
| How is equipment identified as suitable for hazardous locations? | p. 192 |
| Is there any length limitation on flexible conduit runs or flexible fittings in Class I areas? | p. 196 |
| Is "explosionproof flex" permitted between an enclosure and a required seal? | p. 198 |
| What types of facilities are and are not covered by Article 511? | p. 200 |
| What type of portable lighting is permitted in garages and aircraft hangars? | p. 204 |
| Is there a way to use ordinary equipment in a hazardous area? | p. 205 |
| Are optometrists' or psychologists' offices patient care areas? | p. 207 |
| Is special wiring or other special equipment required for patient care areas? | p. 209 |
| What loads are permitted on the equipment branch of an essential electrical system in a hospital? | p. 213 |
| What requirements apply to temporary wiring at trade shows and conventions? | p. 214 |
| Special Equipment, Conditions, and Systems and Related Standards | p. 217 |
| When does Article 645 apply? | p. 218 |
| Why are special boxes required for connections to pool luminaires? | p. 220 |
| Where are receptacles required for pools, spas, and hot tubs? | p. 222 |
| How is bonding to be accomplished for hydromassage bathtubs? | p. 226 |
| May the power supply to a fire pump originate in a service panel switchboard? | p. 228 |
| What physical separation is required for a fire pump service disconnect? | p. 231 |
| Which conductors for fire pumps require special routing and protection? | p. 233 |
| How are emergency loads identified by the NEC? | p. 237 |
| Are transfer switch control wires considered to be emergency wiring? | p. 238 |
| Is more than one emergency system permitted in a building? | p. 240 |
| Is emergency power required to be supplied when a branch circuit fails? | p. 244 |
| Is an outside generator for an emergency or standby system a "separate structure"? | p. 245 |
| How do I know if a circuit is Class 1, Class 2, or Class 3? | p. 247 |
| What are the bonding and grounding requirements for control circuits? | p. 249 |
| How are rules for data and communications circuits applied to a Class 2 "interbuilding circuit"? | p. 253 |
| When or where are "low-voltage" cables required to be in conduit? | p. 257 |
| Are separations required between power and instrument or control wiring? | p. 259 |
| What is the purpose of "CI" cable? | p. 261 |
| What wiring method should be used to interconnect residential smoke detectors? | p. 263 |
| Are communications cables permitted on a roof without a raceway or overhead clearance? | p. 264 |
| What raceways or equipment are required to be grounded in communications systems? | p. 266 |
| Does the NEC specify minimum spacing between conductors for communications and power? | p. 267 |
| Are communications and power system grounding electrodes required to be interconnected? | p. 269 |
| How is raceway fill determined for multiconductor cables? | p. 271 |
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