Electrical Exam 2
What 2 types of transients do surge protection devices (SPD) protect against?
1. Ring wave (originate within the building) 2. Impulse (originate outside the building)
What are 2 types of arcing that AFCI devices protect against?
1. Series Arcs 2. Parallel Arcs
When do cables require guard strips in accessible attics?
1. The cables are run across the top of ceiling joists 2. The cables are run on studs or rafters within 7' of the ceiling joists
What are the 3 types of recessed luminaires?
1. Type Non-IC (cannot be buried in thermal insulation) 2. Type IC (can be buried in thermal insulation) 3. Inherently Protected (can be buried in thermal insulation)
What 7 things are flexible cords not permitted to be?
1. Used as a permanent wiring method 2. Run through holes in walls and ceilings 3. Run through doorways and windows 4. Attached to building surfaces 5. Concealed above ceilings or in walls and floors 6. Installed in raceways 7. Used where subject to physical damage
What 2 colors can the grounded conductors (neutral) be?
1. White 2. Gray
Fluorescent luminaires surface mounted on low-density fiberboard must have what spacing from the fiberboard?
1.5"
Most general purpose NEMA motors are rated to operate at what % of the motor's rated voltage?
10%
How many feet away from pools and fountains must outdoor lighting be?
10'
What is the maximum length of a hallway without requiring a receptacle?
10'
Cable run through EMT must be secured within how many inches of the EMT?
12"
Junction boxes must be at least how far from luminaires?
12"
The maximum current draw for the overhead garage door motor and lights must not exceed what?
15 amps
(Single non-motor operated electrical appliances) What is the amperage of the overcurrent protection device if the appliance does exceed 13.3 amps?
150% of the appliance rating
What is the minimum and maximum cord lengths for a food disposal?
18"-3'
What is the high temperature cutoff for residential water heaters?
190 Degrees
How many supports do lighting tracks less than 4' have?
2
(Single non-motor operated electrical appliances) What is the amperage of the overcurrent protection device if the appliance does not exceed 13.3 amps?
20 amps
Receptacles that serve countertops are not to be located more than how many inches above the countertop?
20"
What temperature does the T/P relief valve open?
210 Degrees
A typical residential water heater is provided how many volts?
240
Double-Pole Switches are commonly used to control what?
240V loads such as dryers and motors
At least one receptacle shall be installed in an attic with HVAC equipment how many feet from the equipment?
25'
What is the manufacturer recommended maximum length of a GFCI protected branch circuit?
250'
Branch circuit conductors within how many inches of ballasts are required to have insulation rated at 90 degrees?
3"
Type Non-IC luminaires have what minimum clearance from thermal insulation?
3"
What is the no-luminaire zone in relation to the bathtub?
3' horizontally and 8' vertically
What is the minimum and maximum cord lengths for dishwashers?
3'-4'
What is the length of flexible metal whips?
3'-6'
What is the typical ampere rating of the outlet servicing the dryer?
30
Conduit can have how many bends (in degrees) before a junction box is required?
360 degrees
Increments of how many feet n track lighting require an extra support?
4'
The maximum current draw for the overhead garage door motor must not exceed what?
5 amps
Lighting tracks need to be installed more than how many feet from finish floor?
5'
Push buttons must me installed how many feet above the garage floor?
5'
What is the diameter of a T5 fluorescent lamp?
5/8" - The number following the T is divided by 8
What is the minimum load used when calculating branch circuit requirements for a dryer?
5000 Watts or the nameplate rating of the dryer (whichever is larger)
How many risers are required before you need a light with a switch on both sides for the stairs?
6 risers
Discharge piping for the T/P relief valve must be installed how many inches above the floor?
6"
The T/P relief valve is located within how many inches of the top of the water heater?
6"
The garage door sensor shall not be mounted higher than how many inches?
6"
Outlets within how many feet of a sink must be GFCI protected?
6'
The receptacle for the laundry area must be within how many feet of the washer?
6'
What is the minimum amount of CFM needed to service the exhaust fan requirements of a 2000 square foot house?
6000 CFM - SF x 3
What is the maximum weight that a ceiling fan box can support?
70 lbs
What is the minimum exhaust fan square footage to service a house with a required 6500 CFM?
8.7 square feet - CFM / 750
How does a GFCI work?
A GFCI monitors the current balance between the ungrounded "hot"conductor and the grounded conductor. As soon as the current flowing through the "hot" conductor is in the range of 4-6 milliamps more than the current flowing in the return "grounded" conductor the GFCI trips off.
What is the definition of a continuous load?
A load where the maximum current is expected for 3 hours or more
What is a sone?
A noise rating system
What is an outlet?
A point on the wiring system at which current is taken to supply utilization equipment
How are ballasts sound rated?
A-F
What is the definition of a bathroom?
An area including a basin with one or more of the following: a toilet, urinal, tub, shower, bidet, or similar plumbing fixture
What is the definition of a kitchen?
An area with a sink and a permanent provisions for food preparation and cooking
Where is AFCI protection required?
Circuits supplying outlets installed in family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sun rooms, recreation rooms, closets, hallways, and other similar rooms
What class of wiring is used for hate overhead door operator and push buttons?
Class 2 wiring
What type of AFCI device is mandatory in the panel where the branch circuit originates?
Combination AFCI. It provides AFCI protection for both the branch/feeder and the outlets
Low watt density heating elements are generally what shape?
Double looped
T/ F - GFCI devices do not need to be readily accessible
F
T/F - All AFCI devices provide GFCI protection
F
T/F - All conductors for a single circuit don't need to be contained in the same raceway or cable tray
F
T/F - An underground installation is not considered a wet location
F
T/F - Conventional recessed luminaires can be used for sloped ceiling
F
T/F - If an electric dryer or range is wired with the neutral wire as the ground and it meets 1996 code requirements the wiring needs to be redone
F
T/F - Lighting tracks can be installed within the 8' and 3' buffer zone around the bathtub
F
T/F - Post lanterns and outdoor lights do not need to be grounded
F
T/F - Standard incandescent lamp dimmers can be used to control fan motors and fluorescent ballasts
F
T/F - The branch circuit that supplies the dryer receptacle can also pick up other receptacles
F
T/F - The branch that services the garage is required to be AFCI protection
F
T/F - The earth is considered an effective ground-fault current path
F
T/F - The food disposal and the dishwasher can be connected to the 20 amp circuits servicing the kitchen countertops?
F
T/F - A ballast given a sound rating of "A" is the loudest
F - "A" is the quietest
T/F - Bathroom circuits for GFCI receptacles can include receptacles in other rooms
F - Circuits for the bathroom can only pick up receptacles located in the bathrooms
T/F - Any conductors can run through junction boxes that serve luminaries
F - Conductors not used for the luminaires cannot be run through luminaire junction boxes unless the boxes are labeled for through wiring
T/F - GFCI breakers break both hot and neutral conductors
F - GFCI breakers break only the hot conductor
T/F - Outlets that are a part of the permanent wiring of the building and is used for temporary construction power are not required to be GFCI protected
F - If it is used for temporary construction power it needs to be GFCI protected.
T/F - If the voltage in a circuit it doubled then the amperage is also doubled
F - If the voltage is doubled then the amperage is halved. The vice versa is true also.
T/F - The receptacle servicing the garbage disposal must be GFCI protected
F - It is not required
T/F - A single receptacle can be rated at 15 amp if located on a 20 amp circuit
F - It must be rated at 20 amp because it is a single receptacle
T/F - A GFCI protects against electrical shocks that occur when a person holds both the circuit conductors at the same time
F - It won't trip because the current flowing through both conductors is the same. There is no current lost to ground.
T/F - The code allows for conductors to be run between trees but not up the trunks of trees
F - The code allows cables to run up trees but cables cannot hang between adjacent trees
T/F - The top receptacle of a duplex receptacle is recommended as the switched receptacle
F - The cords that are plugged into the top will cover the bottom receptacle
T/F - Fire and smoke alarms should be connected to a GFCI protected circuit
F - The fire and smoke alarms will nuisance trip
T/F - A 30 amp dryer receptacle will fit in a 2" device box
F - The receptacle is too wide
T/F - The 20 amp circuits required to service kitchen countertops can also service dishwashers, garbage disposals, and exhaust fans
F - These 3 appliances cannot be connected to the small appliances circuits serving the countertops
T/F - Both the red and black wire can be connected to the same phases in a multiwire circuit
F - This will overload the neutral
T/F - Travelers are always red and white wires
False - Travelers can be any color
What letter is used for ground terminal marking?
G
What is the requirement for guard strips with cable in non accessible attics?
Guard strips are only required if the cable is within 6' of the attic entrance
What does IDCI stand for?
Immersion detection circuit interrupter
What is the effect of operating an incandescent lamp at a lower voltage than the recommended level?
Lifetime is extended but lumen output is reduced. If voltage is above the recommended level the lifetime is reduced and the lumen output is increased.
How is light bulb efficiency measured?
Lumens per watt
What is the maximum distance between points of support for wiring NM and NMC cable to suspended ceiling luminaires? All other wiring methods?
NM/NMC - 4.5' All other luminaires - 6'
What is the minimum cross sectional area of a conduit body?
No less than twice the cross sectional area of the largest conductor connected to the conduit body
Can a neutral conductor of a multi-wire branch circuit be shared when using AFCI and GFCI devices?
No. Not unless the device is listed for sharing a neutral.
Where are IDCIs found?
On the end of cord-and-plug appliances like a hair dryer
What is an AFCI designed to do?
Sense and respond to an arcing fault that could develop into a fire
What are conduit bodies for?
Sharp changes in conduit angles and direction
T/F - A range hood can be plug-and-cord connected
T
T/F - AFCI protection is not required in the unfinished basement area
T
T/F - All electrical appliances are required to have a disconnecting means
T
T/F - All outlets in bedrooms require AFCI protection
T
T/F - All receptacles listed in 210.52 are required to be tamper resistant
T
T/F - An electric clothes dryer requires a separate circuit
T
T/F - An individual disconnect must be in sight of e controller and must disconnect the controller
T
T/F - Appliances must be marked with the minimum supply conductor ampacity and maximum over current protection
T
T/F - Conduit body and boxes can serve as the grounding means instead of a grounding wire
T
T/F - Derating of conductors is not required for raceways that are shorter than 24"
T
T/F - GFCI receptacles break both hot and neutral conductors
T
T/F - Multiple disconnects are not needed if one disconnect is in sight of the (1) controller (2) motor (3) driven machinery
T
T/F - Outlets that are not part of the permanent wiring of the building and is used for temporary construction power are required to be GFCI protected
T
T/F - Permanently installed fire alarm systems are not GFCI or AFCI protected?
T
T/F - Suggested rotation of ceiling fan blades is to direct air up during the winter and down during the summer
T
T/F - The "unit switch" on an appliance is an acceptable disconnect for an appliance as long as the switch has a marked "Off" position
T
T/F - The circuit feeding the laundry area receptacle(s) can't have any other outlets on it
T
T/F - The mandatory requirement for AFCI protection is only for new construction
T
T/F - Trenches should not be kback filled with rocks and debris
T
T/F- For permanently connected motor driven appliances a disconnect switch or circuit breaker in the panel board may swerve as the disconnecting means
T
T/F - A duplex receptacle can be rated at 15 amp if located on a 20 amp circuit
T - It can be rated at 15 amps because it is possible to pull current from both receptacles
T/F - The receptacle servicing the fridge does not need to be GFCI protected
T - It is not servicing the kitchen countertops
T/F - The disconnect does not need to be in sight of the motor and the driven machinery
T - Only if the disconnect can be individually locked in the open "OFF" position
T/F - A GFCI does not limit the magnitude of the ground-fault current
T - What a GFCI does limit is the length of time that the ground fault flows.
What do the letters "TR" on a receptacle represent?
Tamper resistant
What is the definition of a "return"?
The conductor that runs from the switch back to the switched outlet. It is part of the switch loop.
What is the definition of a "switch loop"?
The conductors that run to and from a switched outlet and the switch controlling that outlet
What is the definition of "in sight"?
The controller must be visible and not more than 50' from the disconnect
What is the "half-life" rule?
The expected life of electrical equipment is cut in half for every 21 degrees above the maximum operating temperature the equipment operates at
When does the neutral carry the difference between two hot conductor's load?
When the hot conductors are pulled off different panels
When does the neutral carry two hot conductor's combined load?
When the hot conductors are pulled off the same panel
What the exception for using GFCI protected receptacles for temporary power on a construction site?
Writing and updating a "Assured Equipment Grounding Conductor Program"
What letters are used for ungrounded terminal marking?
X and Y
T/F - Guard strips are not required for cable that is run along the sides of rafters
studs, and floor joists,T
When does parallel arcing occur?
When current tries to jump back and forth between the hot and neutral conductors. This typically happens because of nails driven into the wire or staples are too tight.
At least how many lighting outlets must be installed in habitable attics?
1
At what depth from the stud edges are cables considered protected?
1 1/4"
1 lumen on 1 square foot produces what?
1 foot candle
What is the noise rating of a fridge fan?
1 sone
What are examples of a "damp location"?
1. Carport roof 2. Patio
What are the 5 different types of AFCI devices?
1. Combination 2. Branch/Feeder 3. Outlet 4. Portable 5. Cord
What are the 4 different fluorescent lamp types?
1. Daylight (D) 2. Cool White (CW) 3. White (W) 4. Warm White (WW)
What 2 colors can the equipment grounding conductor (ground) be?
1. Green 2. Green with yellow stripe
"Hot" conductors can't be what 4 colors?
1. Green 2. White 3. Gray 4. Three white stripes
A disconnecting means for a motor must do what 3 things?
1. Open all ungrounded conductors 2. Open all poles simultaneously 3. Not close automatically
What are 4 major types of ballast types?
1. Rapid Start 2. Preheat 3. Instant Start 4. Dimming
What label must be on a receptacle is located under a covered carport?
"Acceptable for Damp Conditions"
What must be labeled on the box in order to support a ceiling fans weight?
"Acceptable for Fan Support"
What label must be on a receptacle is located outside without a roof?
"Acceptable for Wet Conditions"
What labels must products used for outdoor lighting have?
"Outdoor Use Only"
How is cable designated for use with submersible pumps marked?
"Submersible pump cable"
Luminaires installed in a dropped ceiling must have what label?
"Suspended Ceiling Luminaire"
Conductors that are suitable for wet locations have what label?
"W" - THW or RHW
Type Non-IC luminaires have what minimum clearance from combustible materials?
.5"
What is the maximum allowable current "leakage" for cord-and-plug appliances?
0.5 milliamps
The rating of the branch circuit is bad on what?
The rating of the overcurrent device
What is the main difference between a hydromassage tub and a regular bathtub?
The recirculating piping system and the electric pump
What is the definition of "speed of recovery"?
The time required to bring water temperature to satisfactory levels in a given length of time
High watt density heating elements are generally what shape?
U-shaped
The nameplate of an appliance must show what 2 things?
Volts and Amperes/Volts and Watts
What letter is used for neutral terminal marking?
W
All 15 and 20 amp receptacles installed in damp and wet locations are required to be what?
Weather resistant
What do the letters "WR" on a receptacle represent?
Weather resistant
When does series arcing occur?
When a current carrying conductor breaks or becomes loose. The current tries to jump across the opening created by the break or loose connection.
