NEC Q and A: Questions and Answers on the National Electrical Code

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Jones & Bartlett Learning, 2007 - 283 páginas
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Beginners will find answers to practical on-the-job problems, and experts will be able to explore the reasons behind NEC rules and the additional issues related to each question in this examination of frequently- and not-so-frequently-asked questions. Based on questions posed to, and answered by, NFPA's Advisory Services engineers, NEC® Q&A: Questions and Answers on the National Electrical Code includes hundreds of NEC specific questions, along with references to NEC Articles and Sections.
 

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Chapter
4
4 Are electrical substations covered by the NEC?
6
7 Are all switches required to have a shortcircuit or interrupting rating?
12
10 How are the requirements for working spaces determined?
19
11 What working spaces apply to HVAC equipment?
26
14 What clearance is required for equipment that is serviced only while
32
What types of devices are permitted for providing AFCI protection?
44
Do unit load values for general lighting include factors for continuous
54
15 What are the differences in requirements for boxes in combustible
130
19 Do the extended support lengths for RMC apply where threepiece cou
141
cords and extension cords?
151
breakers?
177
Special Occupancies
187
4 Is there any length limitation on flexible conduit runs or flexible fittings
196
7 What type of portable lighting is permitted in garages and aircraft
204
11 What loads are permitted on the equipment branch of an essential electri
213

Are goosenecks permitted to be located below service drop
62
Where is an overcurrent device required to be located in a circuit?
76
Must water piping and steel be bonded where there is no building?
84
17 Is a lighting pole considered grounded by a direct connection to
85
20 Should a service lateral include a grounding or bonding conductor?
93
Wiring Methods and Materials
102
6 Are receptacles permitted in plenum ceilings?
110
8 When are solid conductors allowed in raceways?
116
13 How are ampacity calculations coordinated with termination and continu
123
Special Equipment Conditions and Systems
217
4 How is bonding to be accomplished for hydromassage bathtubs?
226
7 Which conductors for fire pumps require special routing
233
10 Is more than one emergency system permitted in a building?
240
13 How do I know if a circuit is Class l Class 2 or Class 3?
247
15 How are rules for data and communications circuits applied to a Class 2
253
17 Are separations required between power and instrument or control
259
21 What raceways or equipment are required to be grounded in communica
266
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