| True or False: A service disconnecting means must clearly indicate whether it is in the open or closed position. | | 1/1/2009 | 1/1/2009 |
| Does the NEC® require that an exterior light be provided for a second floor balcony?
| | 1/1/2010 | 1/1/2010 |
| True or False: Threaded rigid metal conduit or threaded steel intermediate metal conduit can be used for wiring of electrical equipment in Class I, Division 1 locations. | | 1/10/2009 | 1/10/2009 |
| Does Article 500 provide protection techniques for electrical and electronic equipment in hazardous locations? | | 7/2/2010 | 7/2/2010 |
| Must boxes and fittings used in Class I, Division 1 locations be approved for the location? | | 1/11/2009 | 1/11/2009 |
| True or False: Threaded rigid metal conduit or threaded steel intermediate metal conduit can be used for wiring of electrical equipment in Class I, Division 1 locations. | | 7/3/2010 | 7/5/2010 |
| Must all wiring and equipment in Class I locations be bonded using bonding jumpers or other approved means of bonding? | | 1/12/2009 | 1/12/2009 |
| Must boxes and fittings used in Class I, Division 1 locations be approved for the location? | | 7/6/2010 | 7/6/2010 |
| Must surge arrestors installed in Class I, Division 2 locations be non-arcing? | No [501.35(B)] But if not the non arcing type they, they must be installed in an enclosure identified for Cl I Div 1 locations | 1/13/2009 | 1/13/2009 |
| Must boxes and fittings used in Class II, Division 2 locations be dusttight? | | 7/7/2010 | 7/7/2010 |
| Are multiwire branch circuits permitted in Class I, Division 1 locations? | No [501.40] unless the conditions of the exception are met | 1/14/2009 | 1/14/2009 |
| Must rotating machinery installed in Class III locations be totally enclosed? | Yes [ 503.125] unless the exception applies | 7/8/2010 | 7/8/2010 |
| Must boxes and fittings used in Class II, Division 2 locations be dusttight? | | 1/15/2009 | 1/15/2009 |
| True or False: An intrinsically safe circuit is one in which any spark is incapable of causing ignition in flammable or combustible material. | | 7/9/2010 | 7/10/2010 |
| Must rotating machinery installed in Class III locations be totally enclosed? | | 1/16/2009 | 1/16/2009 |
| True or False: Intrinsically safe apparatus, enclosures, and raceways do not need to be connected to the equipment grounding connector. | | 7/11/2010 | 7/12/2010 |
| True or False: An intrinsically safe circuit is one in which any spark is incapable of causing ignition in flammable or combustible material. | | 1/17/2009 | 1/17/2009 |
| True or False: In Class I, Zone 0 locations, only intrinsically safe wiring methods are permitted. | | 1/17/2010 | 1/17/2010 |
| Are fittings used to connect Type MC cable to boxes, cabinets, or other equipment required to be listed and identified for the use? | | 1/18/2008 | 1/18/2008 |
| True or False: Intrinsically safe apparatus, enclosures, and raceways do not need to be connected to the equipment grounding connector. | | 1/18/2009 | 1/18/2009 |
| True or False: Uninsulated exposed parts are allowed in wet Class I locations as long as they operate at 30 volts or less. | | 7/13/2010 | 7/13/2010 |
| Can less-flammable liquid-filled transformers be installed on the roofs of buildings? | | 1/19/2009 | 1/19/2009 |
| True or False: Class II or Class III, Division 1 or Division 2 locations may be reclassified as Zone 20, Zone 21, or Zone 22 locations. | | 7/14/2010 | 7/14/2010 |
| Is a conductor considered to be outside a building if it is installed under 2 inches or more of concrete beneath the building? | | 1/2/2009 | 1/2/2009 |
| Is a floor receptacle installed 16 inches from a wall still counted towards the receptacles required to be spaced along the wall? | | 1/2/2010 | 1/2/2010 |
| Can the zone classification system be used as an alternative to the division classification system for Class I locations? | | 1/20/2009 | 1/20/2009 |
| Must a parking garage be classified even if no repairs or fuel dispensing take place? | | 7/15/2010 | 7/15/2010 |
| Can a portion of a Class I, Division 1 or 2 location be reclassified under the zone system, while leaving another portion of the same space containing the same flammable gas or vapor source under the Division classification? | | 1/21/2009 | 1/21/2009 |
| Must aircraft electrical systems be de-energized when the aircraft is stored in a hangar? | | 7/16/2010 | 7/17/2010 |
| True or False: In Class I, Zone 0 locations, only intrinsically safe wiring methods are permitted. | | 1/22/2009 | 1/22/2009 |
| Where in the Code can Class I, Group D divisions identified for locations and equipment within motor fuel dispensing facilities be found? | | 7/18/2010 | 7/19/2010 |
| True or False: Uninsulated exposed parts are allowed in wet Class I locations as long as they operate at 30 volts or less. | | 1/23/2009 | 1/23/2009 |
| Can underground wiring in bulk fuel storage plants be of threaded steel intermediate metal conduit? | | 7/20/2010 | 7/20/2010 |
| True or False: Class II or Class III, Division 1 or Division 2 locations may be reclassified as Zone 20, Zone 21, or Zone 22 locations. | | 1/24/2009 | 1/24/2009 |
| True or False: All metal raceways, metal armor or metallic sheath of cables, and all non–current-carrying metal parts of fixed or portable equipment installed in areas used for spray application or dipping and coating processes must be grounded and bonded. | | 7/21/2010 | 7/21/2010 |
| True or False: Only equipment listed and marked as suitable for the location is permitted in Zone 20, Zone 21, or Zone 22 locations. | False [ 506.20(A), (B), and (C)] the equipment described in the exceptions is also permitted | 1/25/2009 | 1/25/2009 |
| True or False: Portable electric luminaires cannot be used in a spray area during spray operations. | | 7/22/2010 | 7/22/2010 |
| Must a parking garage be classified even if no repairs or fuel dispensing take place? | | 1/26/2009 | 1/26/2009 |
| Are multiwire branch circuits permitted in Class I, Division 1 locations? | No [ 501.40] unless the conditions of the exception are met | 7/23/2010 | 7/24/2010 |
| Must aircraft electrical systems be de-energized when the aircraft is stored in a hanger? | | 1/27/2009 | 1/27/2009 |
| Can the zone classification system be used as an alternative to the division classification system for Class I locations? | | 7/25/2010 | 7/26/2010 |
| Where in the Code can Class I, Group D divisions identified for locations and equipment within motor fuel dispensing facilities be found? | | 1/28/2009 | 1/28/2009 |
| True or False: Class I locations are those in which flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are present. | | 7/27/2010 | 7/27/2010 |
| True or False: Each motor fuel dispensing device must be provided with a means, capable for being locked in the open position, to remove all external voltage sources during maintenance and servicing. | | 1/29/2009 | 1/29/2009 |
| True or False: Threaded rigid metal conduit or threaded steel intermediate metal conduit can be used for wiring of electrical equipment in Class I, Division 1 locations. | | 7/28/2010 | 7/28/2010 |
| What is the minimum rating of a single-circuit branch-circuit disconnecting means serving an additional building on a property? | | 1/3/2009 | 1/3/2009 |
| Is there a minimum height requirement for the installation of luminaires supplied by branch circuits operating at more than 277 volts, nominal, to ground? | | 1/3/2010 | 1/3/2010 |
| Can underground wiring in bulk fuel storage plants be of threaded steel intermediate metal conduit? | | 1/30/2009 | 1/30/2009 |
| Must boxes and fittings used in Class I, Division 1 locations be approved for the location? | | 7/29/2010 | 7/29/2010 |
| True or False: Portable electric luminaires cannot be used in a spray area during spray operations. | | 1/31/2009 | 1/31/2009 |
| Must a parking garage be classified even if no repairs or fuel dispensing take place? | | 7/30/2010 | 7/31/2010 |
| True or False: Documentation on all areas designated as hazardous (classified) locations must be available to those authorized to design, install, inspect, maintain, or operate electrical equipment at the locations. | | 1/4/2009 | 1/4/2009 |
| Is a 125-volt, 15-ampere single receptacle without GFCI protection permitted to supply a garage door opener in a dwelling unit garage? | | 1/4/2010 | 1/4/2010 |
| Can rooms containing ammonia refrigeration systems be “unclassified” locations if adequately ventilated? | | 1/5/2009 | 1/5/2009 |
| True or False: Documentation on all areas designated as hazardous (classified) locations must be available to those authorized to design, install, inspect, maintain, or operate electrical equipment at the locations. | | 1/5/2010 | 1/5/2010 |
| True or False: Class I locations are those in which flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are present.
| | 1/6/2009 | 1/6/2009 |
| Can rooms containing ammonia refrigeration systems be “unclassified” locations if adequately ventilated? | | 1/6/2010 | 1/6/2010 |
| True or False: Class II locations are those where combustible dusts are present. | | 1/7/2009 | 1/7/2009 |
| True or False: Class III locations involve the presence of easily ignitible fibers or materials producing combustible flyings, which fibers or flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitible mixtures. | | 1/7/2010 | 1/7/2010 |
| True or False: Class III locations involve the presence of easily ignitible fibers or materials producing combustible flyings, which fibers or flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitible mixtures. | | 1/8/2009 | 1/8/2009 |
| True or False: Class I locations are those in which flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are present. | | 1/8/2010 | 1/8/2010 |
| Does Article 500 provide protection techniques for electrical and electronic equipment in hazardous locations? | | 1/9/2009 | 1/9/2009 |
| True or False: Class II locations are those where combustible dusts are present. | | 7/1/2010 | 7/1/2010 |
| True or False: Employees are responsible for reporting any hazardous incident around power electronic equipment. | True [340.7(B)(6)] | 10/1/2008 | 10/1/2008 |
| True or False: Only the required receptacles installed at patient bed locations of general and critical care areas must be listed and identified as “hospital grade.” | | 10/1/2009 | 10/3/2009 |
| True or False: Each PV system module or array must be provided with a disconnecting means. | | 10/10/2009 | 10/10/2009 |
| True or False: PV circuit conductors are required to be installed in a raceway where the system operates at greater than 30 volts and the conductors are readily accessible. | | 10/11/2009 | 10/11/2009 |
| True or False: The wiring method for conductors supplied by fuel cell systems must be metal raceways only. | | 10/12/2009 | 10/12/2009 |
| True or False: Standard twist-lock connectors with the proper voltage and amperage rating are permitted to be used for connecting the components of a photovoltaic array operating at 30 volts nominal. | | 10/13/2009 | 10/13/2009 |
| True or False: Junction boxes installed behind a PV module are not considered to be accessible if the module is fastened in place using screws. | | 10/14/2009 | 10/14/2009 |
| True or False: All junction boxes, combiner boxes, disconnecting means, and devices containing energized dc circuit conductors of an ungrounded PV system must be labeled if the conductors are exposed during servicing. | | 10/15/2009 | 10/15/2009 |
| True or False: Grounding electrode systems are not required where an ac or dc PV system operates ungrounded. | | 10/16/2009 | 10/16/2009 |
| True or False: For a fuel cell system, the location of the manual fuel shut-off valve is specified by Article 692. | | 10/17/2009 | 10/17/2009 |
| True or False: The Code does not permit the connection of a single-phase interactive fuel cell to a 3-phase power system.
| | 10/18/2009 | 10/18/2009 |
| Does Article 690 contain all the requirements for the installation of PV system storage battery? | | 10/19/2009 | 10/19/2009 |
| True or False: The hazard/risk evaluation procedure described in Annex F is required by NFPA 70E. | False [Annex F] | 10/2/2008 | 10/2/2008 |
| Does the Code place a restriction on the number of or voltage for storage batteries of a photovoltaic system for dwellings? | | 10/20/2009 | 10/20/2009 |
| True or False: 50 volts nominal is the maximum storage battery voltage for an industrial complex PV system. | | 10/21/2009 | 10/21/2009 |
| True or False: The adjusting means for control of the charging process of the battery in a PV system is permitted to be accessible to all personnel. | | 10/22/2009 | 10/22/2009 |
| Are flexible cables 2/0 AWG or larger indentified in Article 400 permitted to be used for battery interconnections within the battery enclosure? | | 10/23/2009 | 10/23/2009 |
| True or False: Terminals, lugs, devices, and connectors are required to be listed and marked for use with flexible fine-stranded cables that are used for battery interconnections. | | 10/24/2009 | 10/24/2009 |
| If a solar photovoltaic system operates with a maximum system voltage over 600 volts dc, are only the provisions of Article 490 required to be followed? | | 10/25/2009 | 10/25/2009 |
| True or False: The ampacity of the fuel cell system(s) feeder circuit conductors from the fuel cell system(s) to the premises wiring system is required to be not less than both the name plate rated circuit current and the rating of the fuel cell system(s) overcurrent device(s). | | 10/26/2009 | 10/26/2009 |
| Are fuel cell systems equipment and conductors that are connected to more than one electrical source required to be provided with overcurrent protection? | | 10/27/2009 | 10/27/2009 |
| Are current-carrying conductors of a fuel cell system power source required to be provided with a disconnecting means from all other conductors in a building or other structure? | | 10/28/2009 | 10/28/2009 |
| True or False: In order to provide better performance, fuel cell systems that have both ac and dc grounding requirements do not require the ac grounding system to be bonded to the dc grounding system. | | 10/29/2009 | 10/29/2009 |
| If a fuel cell system uses a utility grid backup, and it is a non–grid-interactive system, is a transfer switch required? | | 10/30/2009 | 10/30/2009 |
| Is the fuel cell system’s utility-interactive inverter required to be connected to the load side of the service disconnecting means? | | 10/31/2009 | 10/31/2009 |
| True or False: All grounded dc solar photovoltaic systems installed on roofs of dwelling units require ground-fault protection.
| | 10/4/2009 | 10/4/2009 |
| True or False: Ground-fault detection and interruption devices must open all grounded and ungrounded PV output circuit conductors. | | 10/5/2009 | 10/5/2009 |
| Do the requirements in Article 690 covering photovoltaic source circuits apply to ac modules? | | 10/6/2009 | 10/6/2009 |
| Provided no 240-volt loads or multiwire branch circuits are supplied, does the NEC® permit a single-phase, 120-volt nominal, stand-alone fuel cell as the supply source for a 3-wire, 120/240-volt distribution panelboard? | | 10/7/2009 | 10/7/2009 |
| Do all disconnecting means associated with PV systems have to be rated “suitable for use as service equipment”? | | 10/8/2009 | 10/8/2009 |
| True or False: PV systems cannot be installed in hazardous (classified) locations. | | 10/9/2009 | 10/9/2009 |
| Is Type AC cable permitted to be used in wet locations? | | 10/31/2008 | 11/1/2008 |
| Can the branch-circuit conductors for a service receptacle installed on the roof be run in the same conduit with the photovoltaic output conductors that run from the roof to the inverter location? | | 11/1/2009 | 11/1/2009 |
| Can Type FCC Flat conductor cable be used for feeders?
| | 11/10/2008 | 11/10/2008 |
| True or False: In general, soldered, welded, or brazed splices are permitted by the NEC®. | | 11/10/2009 | 11/10/2009 |
| How many Type FCC cable runs can cross over each other? | | 11/11/2008 | 11/11/2008 |
| True or False: Dedicated electrical equipment space is another name for working space. | | 6/5/2010 | 6/6/2010 |