QUESTIONS AND ANSWERS
Mechanical, Electrical, Plumbing (MEP)
100%ACCURATE.
Conductor/wire: Copper v. Aluminum - ✅✅Copper is a better conductor, but is more
expensive. Aluminum needs to be bigger to carry as much as copper.
Generated Electricity - ✅✅The Alternating Current (AC) created by power plant generators.
How many "hot" wires does a 3-phase have? How many neutrals? How many grounds? -
✅✅3, 1, 1
How many "hot" wires does a Single phase have? - ✅✅2
What color is a "hot" wire usually? - ✅✅Black/Red
What does a Transformer do? - ✅✅Uses electromagnetism to step down the voltage to a
lower voltage that the building can use and steps up amps.
If amps drive wire size, then is Primary or Secondary bigger? - ✅✅Secondary
What does a System Ground do? - ✅✅Protects the service entrance wiring and connections
from lightning and high voltage surges.
What is a Fuse? - ✅✅an electric overcurrent protection device used to limit the rate of current
flow in a circuit.
What is a Circuit Breaker? - ✅✅An overcurrent protection device with a mechanical
mechanism that may manually or automatically open a circuit when an overload condition or
short circuit occurs.
What is the most common type of Circuit Breaker? - ✅✅Thermal-Magnetic Circuit Breaker
What is the maximum height at which a circuit breaker handle can be installed? - ✅✅6' - 7"
What is the most popular overcurrent device? - ✅✅Fuses
What is a GFCI? - ✅✅A fast-acting receptacle that detects low levels of leakage current to
ground and opens the circuit in response to the leakage.
, Where is a GFCI typically installed? - ✅✅Indoors: Standard receptacle boxes
Outdoor: Weatherproof boxes
What is the smallest current leakage a GFCI can detect? - ✅✅.005A
Purpose of LOTO - ✅✅Stop the electrical flow upstream of the electrical current.
What does NFPA 70E state? - ✅✅The requirements for maximum safety for personal
protective equipment.
What kind of voltage reverses its direction of flow at regular intervals and is the most common
type of voltage used to produce work? - ✅✅Alternating Voltage (AC)
What is current measured in? - ✅✅Amps
What is the common electrical service amperage for Residential? - ✅✅~200A
What is the common electrical service amperage for Commercial? - ✅✅400A+
Electrical Energy Calculation formula - ✅✅E = P x T
Power formula - ✅✅P = E x I
What is a closed circuit? - ✅✅An electrical circuit that is complete and has current flowing
from the power source to the load and back to the power source.
What is an example of an Automatically Controlled Circuit? - ✅✅Sump Pump
How many control locations does a three-way switch have? - ✅✅2
How many control locations does a four-way switch have? - ✅✅3
What is the function of a Receptacle? - ✅✅To supply current to portable electrical equipment.
What is Ground Fault? - ✅✅Any current above the level that is required for a dangerous
shock.
What is the most common way to install NM cable (Romex)? - ✅✅By running it through a
stud wall and floor joists through drilled holes.
How many conductors does NM cable usually contain? - ✅✅2-3 insulated conductors and a
separate bare ground wire.
Mechanical, Electrical, Plumbing (MEP)
100%ACCURATE.
Conductor/wire: Copper v. Aluminum - ✅✅Copper is a better conductor, but is more
expensive. Aluminum needs to be bigger to carry as much as copper.
Generated Electricity - ✅✅The Alternating Current (AC) created by power plant generators.
How many "hot" wires does a 3-phase have? How many neutrals? How many grounds? -
✅✅3, 1, 1
How many "hot" wires does a Single phase have? - ✅✅2
What color is a "hot" wire usually? - ✅✅Black/Red
What does a Transformer do? - ✅✅Uses electromagnetism to step down the voltage to a
lower voltage that the building can use and steps up amps.
If amps drive wire size, then is Primary or Secondary bigger? - ✅✅Secondary
What does a System Ground do? - ✅✅Protects the service entrance wiring and connections
from lightning and high voltage surges.
What is a Fuse? - ✅✅an electric overcurrent protection device used to limit the rate of current
flow in a circuit.
What is a Circuit Breaker? - ✅✅An overcurrent protection device with a mechanical
mechanism that may manually or automatically open a circuit when an overload condition or
short circuit occurs.
What is the most common type of Circuit Breaker? - ✅✅Thermal-Magnetic Circuit Breaker
What is the maximum height at which a circuit breaker handle can be installed? - ✅✅6' - 7"
What is the most popular overcurrent device? - ✅✅Fuses
What is a GFCI? - ✅✅A fast-acting receptacle that detects low levels of leakage current to
ground and opens the circuit in response to the leakage.
, Where is a GFCI typically installed? - ✅✅Indoors: Standard receptacle boxes
Outdoor: Weatherproof boxes
What is the smallest current leakage a GFCI can detect? - ✅✅.005A
Purpose of LOTO - ✅✅Stop the electrical flow upstream of the electrical current.
What does NFPA 70E state? - ✅✅The requirements for maximum safety for personal
protective equipment.
What kind of voltage reverses its direction of flow at regular intervals and is the most common
type of voltage used to produce work? - ✅✅Alternating Voltage (AC)
What is current measured in? - ✅✅Amps
What is the common electrical service amperage for Residential? - ✅✅~200A
What is the common electrical service amperage for Commercial? - ✅✅400A+
Electrical Energy Calculation formula - ✅✅E = P x T
Power formula - ✅✅P = E x I
What is a closed circuit? - ✅✅An electrical circuit that is complete and has current flowing
from the power source to the load and back to the power source.
What is an example of an Automatically Controlled Circuit? - ✅✅Sump Pump
How many control locations does a three-way switch have? - ✅✅2
How many control locations does a four-way switch have? - ✅✅3
What is the function of a Receptacle? - ✅✅To supply current to portable electrical equipment.
What is Ground Fault? - ✅✅Any current above the level that is required for a dangerous
shock.
What is the most common way to install NM cable (Romex)? - ✅✅By running it through a
stud wall and floor joists through drilled holes.
How many conductors does NM cable usually contain? - ✅✅2-3 insulated conductors and a
separate bare ground wire.
