FLASH CARDS
Where the service-entrance phase conductors are installed in parallel, in two or more raceways, the size of the grounded conductor in each raceway shall not be smaller than __________AWG.
1/0 If the ungrounded service-entrance conductors are installed in parallel in two or more raceways or cables, the grounded conductor shall also be installed in parallel. The size of the grounded conductor in each raceway or cable shall be based on the total circular mil area of the parallel ungrounded conductors in the raceway or cable, as indicated in 250.24(C)(1), but not smaller than 1/0 AWG. 2017 NEC - 250.24(C)(2) Parallel Conductors in Two or More Raceways
What is the maximum distance between supports for standard trade size 2 in. Schedule 40 polyvinylchloride conduit (PVC)?
5 FEET PVC conduit shall be supported as required in Table 352.30. Conduit listed for support at spacings other than as shown in Table 352.30 shall be permitted to be installed in accordance with the listing. Horizontal runs of PVC conduit supported by openings through framing members at intervals not exceeding those in Table 352.30 and securely fastened within 900 mm (3ft) of termination points shall be permitted. 2017 NEC - 352.30(B) Supports. Table 352.30 Support of Rigid Polyvinyl Chloride Conduit (PVC) (page 70-203)
What is the minimum length, in feet, for rod and pipe ground electrodes made of specific materials?
8 Feet Rod and pipe electrodes shall not be less than 2.44 m (8ft.) in length and shall consist of the following materials. 2017 NEC - 250.52(A)(5) Rod and Pipe Electrodes
Which of the following is only for replacements in existing installations and is NOT allowed in new installations?
CLASS H RENEWABLE CARTRIDGE Class H cartridge fuses of the renewable type shall be permitted to be used only for replacement in existing installations where there is no evidence of overfusing or tampering. 2017 NEC - 240.60(D) Renewable Fuses
The earth shall not be considered an ____________________ ground-fault current path.
EFFECTIVE Electrical equipment and wiring and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the overcurrent device or ground detector for high-impedance grounded systems. It shall be capable of safely carrying the maximum ground-fault current likely to be imposed on it from any point on the wiring system where a ground fault may occur to the electrical supply source. The earth shall not be considered as an effective ground-fault current path. 2017 NEC - 250.4(A)(5) Effective Ground-Fault Current Path
Normally non-current-carrying conductive materials enclosing electrical conductors or equipment shall be connected together, and to the electrical supply source, in a manner that establishes an effective ____________________ current path.
GROUND-FAULT Normally non-current-carrying conductive materials enclosing electrical conductors or equipment shall be connected together, and to the electrical supply source, in a manner that establishes an effective ground-fault current path. 2017 NEC - 250.4(A)(3) Bonding of Electrical Equipment
Electrical systems that are ___________________ shall be connected to earth in a manner that will limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines and that will stabilize the voltage to earth during normal operation.
GROUNDED Electrical systems that are grounded shall be connected to earth in a manner that will limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines and that will stabilize the voltage to earth during normal operation. 2017 NEC - 250.4(A)(1) Electrical System Grounding
Sheet metal screws shall not be permitted to be used to connect ____________________ conductors or connection devices to enclosures.
GROUNDING Equipment grounding conductors, grounding electrode conductors, and bonding jumpers shall be connected by one or more of the following means: (1) Listed pressure connectors (2) Terminal bars (3) Pressure connectors listed as grounding and bonding equipment (4) Exothermic welding process (5) Machine screws-type fasteners that engage not less that two threads or are secured with a nut (6) Thread-forming machine screws that engage not less than two threads in the enclosure (7) Connections that are part of a listed assembly (8) Other listed means 2017 NEC - 250.8(A) Permitted Methods
Non-conductive coatings (such as paint, lacquer, and enamel) on equipment to be grounded shall be _____________ from threads and other contact surfaces to ensure good electrical continuity.
REMOVED Non-conductive coatings (such as paint, lacquer, and enamel) on equipment to be grounded shall be Removed from threads and other contact surfaces to ensure good electrical continuity.
Circuit breakers used as ________________________ in 120-volt and 277-volt fluorescent lighting circuits shall be listed and shall be marked SWD or HID
SWITCHES Circuit breakers used as switches in 120-volt and 277-volt fluorescent lighting circuits shall be listed and shall be marked SWD or HID. Circuit breakers used as switches in high-intensity discharge lighting circuits shall be listed and shall be marked as HID. 2017 NEC - 240.83(D) Used as Switches
A grounding electrode conductor for a premises wiring system supplied by a grounded ac electrical service must be connected to:
THE GROUNDED SERVICE CONDUCTOR A grounding electrode conductor for a premises wiring system supplied by a grounded ac electrical service must be connected to the grounded service conductor, at each service, in accordance with 250.24(A)(1) through (A)(5). 2017 NEC - 250.24(A) System Grounding Connections
Based on the largest conductor connected to the switch, for the purpose of determining conductor fill in a device box, how many conductor(s) is a three-way switch counted as equal to?
TWO For each yoke or strap containing one or more devices or equipment, a double volume allowance in accordance with Table 314.16(B) shall be made for each yoke or strap based on the largest conductor connected to a device(s) or equipment supported by that yoke or strap. A device or utilization equipment wider than a single 50 mm (2 in.) device box as described in Table 314.16(A) shall have double volume allowances provided for each gang required for mounting. 2017 NEC - 314.16(B)(4) Device or Equipment Fill.
