Hazardous Locations
A Class I location that included ignitable concentration of Group IIC materials under abnormal conditions would be a _____ location.
What is Zone 2 location?
505.5(B)(2) & 505.6(A)
Overhead feeder conductors shall have a minimum ______ vertical clearance over residential property and driveways, as well as those commercial areas not subject to trcuk traffic, where the voltage is limited to 300 volts-to-ground.
What is 12 feet?
225.18(2)
What is the minimum ampacity of the branch-circuit conductors for a 30-hp, 460-volt, 3-phase squirrel-cage motor with a nameplate full-load current rating of 37.5 amperes?
Use table for FLC Table 430.250- 30-hp @ 460-volts FLC = 40 amps; 40 x 125% = 50 amps
430.6(A)(1)
430.22
When IMC is cut in the field, ______ is required to remove the burrs and rough edges.
What is reaming?
342.28
If the transfer switch for a portable generator switches the ______ conductor, then it is being used as a separately derived system and the portable generator shall be grounded in accordance with 250.30.
What is the grounded conductor?
702.11(A)
Combustible dusts and ignitable fibers are classified exactly the same using the ______.
What is a Zone System covered by NEC, Article 506?
506.1
A(n) ______ installed in residential occupancies needs to be connected to an equipment grounding conductor.
What is a refrigerator, freezer and air conditioner?
250.114(3)(a)
Determine the maximum standard size time-delay fuses permitted for the motor branch-circuit short-circuit and ground-fault protection for a 15-hp, 240-volt, 3-phase, squirrel-cage motor with a nameplate full-load current of 40 amperes.
What is 80 amp time-delay fuses?
NEC 430.6(A) use table values; NEC Table 430.250
15-hp @ 240-volts FLC = 42 amps NEC 430.52(C)(1) FLC x 175% 42 x 175% = 73.5 amps NEC 430.52(C)(1) Exc 1 next standard size
Surface metal raceway is a metallic raceway that is intended to be mounted to the surface of a structure, with ______ couplings, connectors, boxes, and fittings for the installation of electrical conductors.
What is associated?
386.2
Hydromassage bathtub electrical equipment shall be ______ without damaging the building structure or building finish.
What is accessible?
680.73
An instrument installed in a Class I location would be permitted to be enclosed in a general purpose enclosure if ______.
What is if it was intrinsically safe?
504.10(D) & 501.105(B)
No ______ splices or taps shall be made within or on a luminaire.
What is unnecessary?
410.56(D)
Power is removed from the rotor by means of slip rings and ______.
What are brushes?
Type UF cable is permitted to be used for ______ wiring.
What is inside?
340.10(4)
Switchboards that have any exposed live parts shall be installed in permanently ______ locations, and then only where under competent supervision and accessible only to qualified persons.
What is dry?
408.20
The surface temperature for fixed luminaire installed in Class III location is limited to _____ degrees F under normal conditions.
What is 329 degrees?
503.5
Raceways and cables installed into the ______ of open bottom equipment shall not be required to be mechanically secured to the equipment.
What is bottom?
300.12 Ex. 2
When current flows from negative to positive.
What is electron flow?
______ shall be installed so that the wiring contained in them can be rendered accessible without removing any part of the building or structure or, in underground circuits, without excavating sidewalks, paving or earth.
What is Boxes, conduit bodies and handhole enclosuers?
314.29
The entire area of an aircraft hangar, including any adjacent and communicating areas not suitably cut off from the hangar, shall be classified as a Class 1, Division 2 or Zone 2 location up to a level ______ in. above the floor.
What is 18 in.?
513.3(B)
Wireways in Class III, Division 1, locations shall ______.
What is shall be dusttight?
503.10(A)(1)
Bends in Type MI cable shall be made so that the cable will not be ______.
What is damaged?
332.24
Mechanical energy that turns the rotor.
What is prime mover?
NUCC and its associated fittings shall be ______.
What is listed?
354.6
All 15A and 20A, 125V receptacles installed in crawl spaces at or below level of ______ units shall have GFCI protection.
What is dwelling units?
210.8(A)(4)