Ohio Electrical Contractor NEC Code and Safety Standards Practice Test

These questions are part of the practice quiz. Start practicing

• What is the purpose of maintaining a clear work space around electrical equipment?
• Is only one service permitted to supply a building or structure?
• What is the maximum allowable load for a branch-circuit?
• Where can listings for specific-purpose branch circuits be found if not referenced in certain chapters?
• In which direction shall the access be for electrical equipment subject to examination while energized?
• What characteristics of the circuit being protected should be selected and coordinated to clear a fault without causing damage?
• In which National Electrical Code Article can you find requirements for the identification of grounded conductors?
• Can ungrounded conductors of circuits with a grounded neutral tap into two-wire DC or AC circuits that have at least two ungrounded conductors?
• Where shall conductors and cables be located in a tunnel installation to protect them from physical damage?
• Is it acceptable to use a junction box or a raceway to feed conductors through or tap off to other switches?
• Is a manhole required to be strong enough to hold up all loads it may be subject to?
• Should the feeder or service calculated load be less than or greater than the sum of the loads of the two largest pieces of kitchen equipment?
• Which component is typically part of an electrical service disconnect?
• What is the minimum vertical clearance required for conductors above the surface of a roof?
• At what distance will a floor receptacle be considered part of the required number of receptacle outlets?
• What is the purpose of the National Electrical Code's Article 215 regarding feeders?
• Which part of the National Electrical Code's Article 110 does NOT apply to equipment on the supply side of a service point?
• What is the maximum distance a receptacle can be from a window to meet the requirements for a show window?
• May all feeder or branch-circuit conductors be attached to a feeder and/or branch-circuit mast?
• What demand factor percentage should be applied to the nameplate rating load for at least four appliances in a single-family dwelling?
• What type of support is required for service-entrance cables?
• Can open conductors be attached to the same fittings used with service conductors?
• Which chapters in the National Electrical Code have the ability to modify one another?
• Which of the following is NOT an acceptable installation for a circuit conductor?
• If flexible cords with attachment plugs are used, is a receptacle required?
• Which of the following is an acceptable form for a porcelain or glass insulator?
• What type of damage is an enclosure-type number mark NOT expected to prevent?
• What is prohibited when cooling electrical equipment?
• In which position must a disconnecting means be capable of being locked?
• Is a disconnecting means required to simultaneously disconnect all ungrounded conductors in multiple branch circuit devices?
• Can a manually operable switch be used as a disconnecting means?
• How far above grade must the point of attachment for overhead service conductors to a building be?
• What safety measure is essential for preventing overload in electrical circuits?
• What is an exception to the insulation requirement for service-entrance conductors?
• Does the applied voltage of an underground service conductor determine the insulation?
• What is the maximum allowable conductor length run without support?
• What other methods are acceptable for supporting service-entrance conductors using a Type SE cable method?
• What value should be used to calculate the EVSE load?
• If conductors are not service conductors, can they be installed in the same raceway or service cable?
• How shall terminals be identified when a grounded conductor is connected?
• Is drainage required for raceways that enclose service-entrance conductors if embedded in masonry?
• Is AFCI protection required for an individual branch circuit to a fire alarm system?
• What factors must be considered when determining the right equipment for an installation?
• Which of the following is an acceptable method of protection for service-entrance cables if likely to be physically damaged?
• What is the primary purpose of the National Electrical Code?
• What factor influences the required thickness of insulation for electrical conductors?
• To what types of load combinations does the requirement for overcurrent protection for feeders apply?
• If there is ample space in raceways, will specifications allow for future increases in electric power and communications circuits?
• What is a common requirement for the location of disconnecting means for electrical equipment?
• Are there restrictions on the maximum loads for general lighting circuits?
• At what percentage of the total connected load should fixed electric space-heating loads be calculated?
• Where can formal procedures for interpreting the National Electrical Code be found?
• What is required for conductors installed in manholes or enclosures allowing personnel entry?
• Is it compliant for a service disconnecting means to consist of multiple switches?
• Is the neutral load of a feeder or service the maximum unbalance of the load?
• What exposures should be limited where conductors or equipment are located?
• What must be included in a feeder diagram?
• What requirements does Article 215 of the National Electrical Code provide for feeders?
• Is it permissible to connect two-wire ac circuits from ungrounded conductors in branch circuits?
• Is a portable multiconductor cable permitted to supply mobile equipment?
• Should a service disconnecting means have a rating that is equal to or less than the load it carries?
• Why is it important to seal unused raceways entering buildings?
• What must be identified for each grounded conductor of an insulated feeder?
• When calculating receptacle loads for an office building, should you use the larger or smaller of the receptacle loads?
• What does Article 220.14 reference for loads on outlets?
• What is required for solidly grounded wye electric services with voltages between 150 volts to ground and 1000 volts phase-to-phase?
• What should be done to an unused current transformer connected to a potentially energized circuit?
• Is it permitted to use a set-screw type pressure connector to complete the connection of conductors to terminal parts?
• Is installation ready for use if it meets requirements and has the proper permits?
• If a disconnecting means is obvious in purpose, is it still necessary to mark it?
• What is required of field-applied hazard markings?
• Which materials may be used as current carrying conductors?
• What is the significance of permanent partitions or screens around live electrical parts?
• What should be done before introducing an individual open conductor into a tube?
• What is the maximum ampere rating for general-use receptacle outlets in guest rooms or suites of hotels or motels that do not require a load calculation?
• Where should surge-protective devices be located in dwelling units and similar facilities?
• To which load does the demand factors in Table 220.45 apply?
• Where is an acceptable location for the disconnecting means required for all ungrounded conductors?
• What is the minimum unit load used for one-, two-, and multifamily dwellings?
• If conductors are installed beneath at least 2 inches of concrete, where are they considered to be?
• What determines the fault level needed for interrupting equipment?
• Can kVA be considered equivalent to kW for household electric ranges and cooking units?
• How should the maximum of six disconnects be mounted?
• If there is a permanent cooking area in a guest room, must the installed branch circuits meet the same rules as those for cooking areas in dwelling units?
• What types of load calculations are covered in Article 220 of the National Electrical Code?
• What is required for a feeder to be derived from an autotransformer?
• Who is tasked with enforcing the National Electrical Code?
• In electrical installations, what is the importance of sealing or locking a device?
• What may also supply one set of service-entrance conductors?
• Are service conductors permitted to be spliced or tapped?
• How should the total load of a feeder be managed compared to branch-circuit loads?
• Must all services, feeders, or branch circuits supplying a building be identified by a permanent plaque?
• What is required for GFI protection in sinks and areas near bathtubs?
• Which voltages are used when calculating branch-circuit, feeder, or service loads?
• How is the minimum load for multifamily dwellings determined?
• What is the primary concern when using outdoor wiring connections?
• Is it permitted to have a load in excess of the branch-circuit ampere rating?
• What is the minimum overhead clearance for open conductors above finished grade or a sidewalk?
• Are neutral loads permitted for feeder or service conductors in schools using optional calculations?
• What type of load should the setpoint value be considered for when calculating loads for EMS?
• How should a 6 AWG or smaller grounded conductor be identified?
• Is it permitted for a personnel access opening to be located directly above electrical equipment or conductors?
• In the National Electrical Code, what do the terms 'shall' or 'shall not' signify?
• Where should outdoor lighting lamps be located in relation to electric utilization equipment?
• When must the allowable ampacity for the minimum branch-circuit size be equal to the maximum load being served?
• What determines the circuit rating if using a conductor with an ampacity higher than 50 amperes?
• How are receptacle requirements typically determined in connection with window displays?
• What is an acceptable wiring method for service-entrance conductors carrying a maximum of 1000 volts?
• How should the load for show-window lighting be measured?
• Where can the load calculation requirements for adding a structural addition to an existing dwelling be found?
• What type of conductor is specifically exempt from certain installation requirements?
• Will the demand factors for general lighting be considered when determining the number of branch circuits for general illumination?
• What color should the service conductor with the higher phase voltage to ground be marked?
• What can result from improper grounding in an electrical system?
• What is required for a branch-circuit overcurrent device if the feeder overcurrent device is not accessible?
• Which of the following is true about the installation of service conductors?
• What is the primary factor affecting load calculations for air-conditioning equipment compared to motors?
• What is the maximum allowable voltage for branch circuits in dwelling units and guest rooms in hotels or motels?
• What is the minimum vertical clearance for overhead service conductors above residential driveways?
• What type of insulators shall be used to support open conductors?
• What is the required rating for a branch circuit supplying a continuous load?
• When can farm loads be combined into a single load for calculation purposes?
• What is a critical step in the setup of electrical systems to enhance safety?
• When should Part IV NOT be used for farm load calculations?
• What is the primary requirement for marking electrical equipment accessible to unqualified persons?
• How can conductor sizes be expressed?
• Which aspect is covered by the National Electrical Code?
• Is it necessary to enclose or separate parts of electrical equipment likely to produce arcs, sparks, flames or molten metal during normal operation?
• What additional requirement is there for feeders that supply equipment requiring grounding conductors?
• What is the primary purpose of ground-fault protection?
• What is one significant consequence of not sealing an overcurrent device?
• What is required for an emergency disconnecting means for one- and two-family dwelling units?
• Which parameter is crucial when measuring the load for show-window lighting?
• What is typically the recommended action when a fuse blows in an electrical circuit?
• What is the minimum depth of working space required for Condition 3 equipment operating at a maximum of 1000 volts?
• Where should cable limiters, meters, and meter disconnect switches typically be positioned?
• What is the role of a service disconnecting means in electrical installations?
• Must the ampacity for service-entrance conductors be at least equal to the maximum load being served after adjustments?
• When determining load for each household electric clothes dryer in a dwelling unit, which value should be used?
• Should a raceway on the exterior of a building be listed or approved for wet locations?
• How must a service disconnect function in relation to conductors?
• Is a warning marking required for electrical equipment in dwelling units?
• Are the conductor sizing requirements the same for motors and air-conditioning equipment?
• When should the disconnecting means be located ahead of the supply side of the fuses?
• Where is a surge protector required?
• What is the minimum clear work space required where cables are only on one side?
• Are optional load calculations permitted for feeder and service applications?
• Must grounded conductors for a premises wiring system be electrically connected to the grounded conductor of the supply system?
• If trolley wires have a ground return, is it permitted to connect circuits for lighting and power from railway conductors?
• How should outdoor lamp holder connections be staggered to avoid insulation puncture?
• What is the primary purpose of overcurrent protection in feeders?
• Is it permitted for equipment supplying an individual dwelling unit to also supply branch circuits for public areas?
• On a 4-wire, delta-connected system, where should the orange marking be placed?
• In what scenario should a disconnecting means be provided for ungrounded conductors?
• What is the requirement for feeder conductors in a new restaurant?
• What should the disconnecting means do when connected to an ungrounded conductor within sight of a transformer?
• What type of wire should be avoided in outdoor lamp holder connections to prevent insulation damage?
• In a multiple-occupancy building, should each occupant have access to their own supply disconnecting means?
• When is a disconnecting means required for all ungrounded conductors?
• Is 8 AWG copper and 6 AWG aluminum the minimum or maximum size for conductors?
• What type of switch can be employed as a disconnecting means for ungrounded service conductors?
• For household electric clothes dryers, what should be the basis of load determination as per the recommendations?
• Are feeder diagrams required to display both demand factors and the calculated load?
• What is the minimum size allowed for an open, individual aluminum conductor with a maximum of 1000 volts and a span of 45 feet?
• Which type of receptacle must be accessible for servicing when used with HVAC equipment?
• How far, vertically, above a roof surface should a conductor be?
• What two factors most commonly determine limitations at terminations?
• What type of receptacle is required for a meeting room that is 1000 square feet?
• What is required for a receptacle outlet that will be used for HVAC equipment?
• Does the requirement for proper marking for identification of terminals include panelboards?
• Which part of the NEC provides requirements for farm load calculations?
• What is typically the focus when calculating loads for receptacles in specific areas like guest rooms?
• What is the purpose of porcelain or glass insulators?
• Should service-entrance conductors be spliced or tapped?
• What should the ampere rating be for a single receptacle on an individual branch circuit?
• Which locations are mandated to have GFI protection for personnel?
• When will the ampacity of the maximum load served be determined for feeders?
• At what locations is grounding and bonding required for electrical equipment?
• Will protection be required for conductors or equipment likely to be subject to objects falling through a ventilation grate?
• Can you supply one building through the interior of another building?
• What is required for service-entrance cables or individual open service-entrance conductors?
• What is the significance of the rating of branch-circuits with respect to total load?
• What is the main function of a disconnecting means in electrical installations?
• What does the point of connection for service raceways refer to?
• What voltage type is not allowed for typical branch circuits in residential settings?
• Which of the following is NOT an acceptable method for connecting the service disconnecting means to the conductors?
• Which insulation is appropriate for individual overhead conductors that are not near any buildings?
• What does Section 110.34 provide specifications for?
• What should be done to ensure the effectiveness of ground-fault protection?
• Should trees be considered proper support for overhead conductor spans?
• Why is it important to adhere to minimum spacing standards for open conductors?
• Should barriers be utilized to prevent contact with a disconnecting device in the open position?
• Does a conductor with white or gray insulation at a circuit termination where the circuit is a maximum of 50 volts need to be grounded?
• What is the maximum voltage allowed for open wiring on insulators installed on the outside surface of a building?
• How should branch circuits be identified if they are supplied from multiple voltage systems?
• How far from the outer surface of a nonmetallic enclosure should a metallic plug or plate be recessed?
• Should the connection of a grounded conductor to a terminal reverse the designated polarity?
• What is the minimum rating required for the branch circuit disconnecting means for a single branch circuit?
• Are modifications allowed for calculating general lighting and other loads for a marina?
• Can a branch circuit recognized by the code also function as a multiwire circuit?
• What is the minimum vertical rise for work space above energized parts?
• What kind of feeder configurations typically have a common neutral?
• What is the minimum spacing required between open conductors on different circuits?
• What must be used when calculating noncoincident loads of motor or air-conditioning equipment?
• Is overload protection necessary for each ungrounded service conductor according to the code?
• Is there a specific section of Article 220 that assists in calculating branch-circuit loads?
• What should be easily installed or removed in a safe workspace for electrical equipment?
• Should ventilation to open air of manholes, tunnels, and vaults occur wherever practical?
• What should be considered when determining the configuration of conduits for overhead wiring?
• What condition must be met to use the actual maximum demand for determining an existing load?
• Which loads may be included with the general lighting load but are NOT subject to the demand factors?
• Are you prohibited from using a neutral conductor for more than one branch circuit?
• Is overcurrent protection required for motor-operated equipment and transformers?
• What type of branch-circuit disconnect requires GFI protection?
• Does Section 220.83 of the NEC provide calculations for adding additional loads to an existing building?
• What should be done to prevent tampering with an accessible automatic overcurrent device protecting service conductors?
• How would you protect equipment from physical damage if installing below ground?
• What must be accomplished for electrical controls in a high-voltage ventilation system installed in a tunnel?
• Which table is appropriate for calculating receptacle loads for a health care facility?
• Can a raceway wiring method be used to protect service conductors entering a building?
• What does Article 110 of the National Electrical Code specify?
• Where should the service disconnecting means be installed?
• What type of insulation is required for open, individual overhead conductors within 10 feet of a building?
• How many receptacles are required within 18 inches of the top of the window for a 10-foot show window?
• Is ground-fault protection required for feeder disconnects rated at a minimum of 1000 amperes?
• If circuits are equipped with a grounded neutral conductor, what can you tap into?
• For a hotel guest room, what is necessary to prevent safety hazards regarding electrical plugs?
• When is it appropriate to use the lesser of two loads in electrical calculations?
• Why is it important to have a disconnect in solidly grounded wye electric services?
• Should a disconnecting means for a fire pump be included in the group of disconnects?
• Must the grounded conductor of a multiconductor cable be insulated or covered?
• Which table in the National Electrical Code provides requirements for circuits with two or more outlets?
• Should spare or unused raceways be sealed where they enter a building?
• When is a disconnecting means considered a service disconnecting means?
• What is an acceptable means of preventing accidental contact with live parts for equipment operating at 50 to 1000 volts?
• Which feeders are allowed to use a common neutral conductor?
• What information must a service disconnecting means clearly indicate?
• What is required to prevent a bed from contacting an attachment plug behind it in a hotel guest room?
• Can you determine the neutral load using optional calculations from Part IV of Article 220?
• What is the modernized version of metric known as in the National Electrical Code?
• What is an approved disconnecting means for ungrounded conductors that pass through buildings?
• Should GFCIs be installed in readily accessible locations and can they be used to protect feeders?
• Are there different requirements for feeder and branch-circuit conductors entering or exiting buildings?
• If a branch circuit is supplying two or more outlets, can the load exceed the branch-circuit ampere rating?
• Why is an inspection necessary upon installation of equipment listed by a qualified electrical testing laboratory?
• What precautions must be taken for indoor electrical installations accessible to unqualified persons?
• What are the minimum required dimensions for clear work space around electrical equipment with exposed, energized parts?
• Which factor is considered when calculating receptacle loads for an office setting?
• Where would you expect to find outside branch circuits and feeders?
• Which areas require at least one wall switch-controlled lighting outlet?
• Is the installation of branch circuits from an autotransformer allowed under the code?
• According to Article 220.14, what are the loads for general use receptacles and outlets based on?
• What is the minimum horizontal clearance required for access to electrical equipment?
• What are the correct dimensions for rectangular and round access openings for manholes?
• What is an acceptable location for the attachment of a service-drop or overhead service conductor to a service mast?
• Can a dwelling unit be supplied using more than one feeder?
• Are meter sockets considered service equipment?
• What type of requirements are specified for branch circuits in the National Electrical Code?
• Which branch circuit setup is permissible when multiple voltages are involved?
• If branch circuits requiring equipment grounding conductors are supplied by a feeder, is the feeder required to provide the equipment grounding conductor?
• How can energized parts that are not enclosed be guarded?
• Should the voltage rating for electrical equipment be less than the voltage of the circuit it is connected to?
• Which method is recommended to enhance safety for electrical installations besides proper grounding?
• What requirement applies to electrical equipment with bare terminals?
• What should be done if a branch circuit supplies devices from different voltage systems?
• Can a grounded conductor use the same insulation as an ungrounded conductor of the same circuit if the system is a maximum of 1000 volts?
• Can demand factors be used when calculating receptacle loads for fixed multioutlet assemblies?
• Should the calculated load of a feeder or service be equal to or greater than the sum of the loads on the branch circuits supplied?
• What are the maximum voltages related to services in Article 230?
• Do calculated loads influence the branch circuits' supply requirements for motor-operated appliances?
• If service equipment is modified, is it necessary to recalculate the available fault-current?
• How is risk mitigated when installing overhead conductors near buildings?
• How far must a service conductor be from working windows or doors?
• Is it acceptable for feeders to operate without proper labeling for grounded conductors?
• Is corrosion resistance required for a fixed ladder in a manhole or enclosure?
• What should NOT exist in a completed wiring installation?
• Is a multiwire branch circuit considered a single circuit for servicing a branch circuit or feeder?
• Where should the disconnects for the grounded conductor typically be situated?
• What is required for multiple disconnects according to NEC guidelines?