General
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts.
What is Enclosed
The minimum size copper equipment grounding installed for a 60 amp feeder supplied by #6 AWG THHN copper conductors
Trade size 4 in metric designation
What is 103
The Full Load Current of a 3 phase, 460 V, 40 HP wound rotor motor
What is 52 Amps
Lightning protection conductors installed on the exterior of a building should be separated from communication wires by this distance.
What is 6'
800.53
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions.
The minimum ampacity rating for a copper feeder tap extending 20 feet from the point of connection to a single set of 2/0 copper conductors being fed from a 150 amp time delay fuse.
50 amps
A unit or assembly of units or sections and associated fittings forming a structural system used to securely fasten or support cables and raceways.
What is cable tray system
Maximum size time delay fuse permitted for primary protection of a 480 Volt transformer that draws 50 amperes on the primary side and does contain secondary protection.
What is 125 Amperes
50*250%=125A
A building or portion of a building designed or intended for the gathering together of 100 or more persons for such purposes as deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similar purposes.
What is an assembly occupancy
What is prolonged submersion
A 6 unit commercial storage facility is fed by a single 200 Ampere service. Each unit has its own disconnect switch located in a group at the service location. This is the minimum rating of each disconnect switch.
What is 60 Amperes
Vertical runs of wireways shall be securely supported at intervals not exceeding this distance.
What is 15 feet
The maximum wattage of a medium base incandescent lamp that is used generally and supplied by a lighting branch circuit.
What is 300 Watts
A transformer is to be mounted to a floating pier in a commercial marina. The electrical connections of the transformer would be required to be spaced by this distance above the pier.
What is 12"
The number of strands in a Class C 600 kcmil copper conductor
What is 91
One or more ridges or grooves located on the exterior of a flexible cord that has integral insulation with the jacket can be used to identify this conductor
What is the Grounded Conductor
Where practicable, dissimilar metals in contact anywhere in an EMT system shall be avoided to eliminate the possibility of this.
What is galvanic action
The largest permissible inverse time circuit breaker to protect a feeder supplying the following 3 phase 208 volt squirrel cage motors: 3 HP, 5 HP, and 10 HP
What is 100 Amps
3 HP - 10.6 A
5 HP - 16.7 A
10 HP - 30.8 A
30.8 * 250 = 77 A - go up to 80 A
80 + 10.6 + 16.7 = 107.3 - go down to 100 A
A power limited fire alarm system is supplied by a circuit breaker in a 200 Ampere 120/208 volt 3 phase panelboard. This phrase shall be written in the panel directory to identify the circuit.
What is "Fire Alarm Circuit"
The minimum elevation of an unguarded 25kV energized cutout.
What is 9'6" or 2.9 meters
Pendant lampholders permanently installed in garages, theaters, and motion picture studios are not required to be connected to an equipment grounding conductor when this condition is met.
What is supplied by a circuit not over 150 volts to ground
The ampacity of (3) 250 kcmil single-insulated 13.8 kV copper MV-90 conductors installed in an underground electrical duct in a 3 circuit configuration with an ambient earth temperature of 20oC.
What is 325 Amperes
A single phase 5 HP, 230 Volt squirrel cage hermetic refrigerant motor compressor with a rated load current of 28 amperes and a branch-circuit selection current of 32 amperes is fed by an individual branch circuit. This is the maximum size inverse-time circuit breaker allowed if motor starting current is not an issue.
What is 50 Amperes
175% of the larger of rated load current or branch-circuit selection current
32*175%= 56 A - Must go down to 50A
This type of battery shall be considered an inherently limited Class 2 power source, provided the voltage is 30 Volts or less and the capacity is equal to or less than that available from series connected No. 6 carbon zinc cells.
What is dry cell