ES3 NM
1. Wiring System: Is a form of electrical circuit.
2. Electrical circuit: Is comprised of an energy source, energy transfer medium
and a load.
3. Energy Transfer Medium: copper wire, fiber optic cables and air in the case of
radiated energy
4. Load: receives the transferred energy such as resistors, lights, speakers, motors,
etc.
5. EMF (electromotive force): The force that moves electrical energy.
6. Current or Current Flow: The movement of electrons through a circuit that is
caused by the electromotive force or voltage applied to the circuit.
7. Inductance (L): Unit is the henry. It is the property of a circuit that causes an
opposition to any change of current within the circuit. As electrons flow, a
magnetic field is produced. The magnetic force induces a change in voltage.
8. Grounding: assures transmission of electrical signals without interference from
electromagnetic radiation from other transmission lines and equipment. This
interference, called crosstalk, can happen from adjacent lines, motors, PCs, lights
and other devices.
9. Grounding electrode: Connection to the electrode should be less than 1 ft below
the surface of the solid and the electrode should extend at least 10 ft below
ground.
10. Ground Loop: Causes a current to flow in the low resistance of the shield
resulting in electromagnetic waves that are picked up as noise through the wire.
11. 66 block: A punchdown block that terminates 22 to 26 AWG solid copper wire.
The 25 pair standard non split 66 block contains 50 rows.
12. 110 block: To terminate on-premises wiring in structured cabling. IDC or
Insulation displacement contact connector is used to terminate the twisted pair. The
110 allows for a much higher density of terminations, less crosstalk and higher
bandwidth data.
1/8
, .
13. UF: Cable can be buried into the ground. Not approved for commercial use in
NM. 340.10
14. Balun: A means of matching an unbalanced antenna or transmission line to a
balanced transmission line or antenna (Usually have a transformer in them)
15. Bus Topology: All nodes are connected to a single shared communication
line
16. Ring Topology: Topology where the computers are connected on a loop or
ring.
17. Star Topology: A topology with one central node that has each computer or
network device attached to the central node. All data first goes into the central node
and then is sent out to its destination.
18. Transducer: A device that converts energy from one form to another
19. Crossover: Divide an output into separate circuits each covering a specific
band or frequency range.
20 inverse square law: Each doubling of distance from the sound source results
in a fourfold reduction of sound power (equal to 6db). If one moves 4' to 8' from a
sound source, the level is reduced by 6 db. Double the distance to 16' and the
level is reduced another 6db to 12 db.
21. Dry Contact Devices: Normally open switch which close on activation and
creates and alarm. Pull stations, heat detectors, four wire smoke detectors,
sprinkler supervisory switches.
22. Conventional Fire Systems: Two types of zones. Initiating and Notification
zones. The number of initiating zones defines how large the system can be.
Most conventional zones use a two-wire scheme and end of line resistor for
supervision or IDC.
23. IDC: Initiating Device Circuit. The IDC connects an auto or manual initiating
device to a zone or a monitoring module.
24. NFPA 72 coverage area for a single zone?: Does not exceed 20,000 square
feet and does not extend beyond a floor of a building.
2/8
1. Wiring System: Is a form of electrical circuit.
2. Electrical circuit: Is comprised of an energy source, energy transfer medium
and a load.
3. Energy Transfer Medium: copper wire, fiber optic cables and air in the case of
radiated energy
4. Load: receives the transferred energy such as resistors, lights, speakers, motors,
etc.
5. EMF (electromotive force): The force that moves electrical energy.
6. Current or Current Flow: The movement of electrons through a circuit that is
caused by the electromotive force or voltage applied to the circuit.
7. Inductance (L): Unit is the henry. It is the property of a circuit that causes an
opposition to any change of current within the circuit. As electrons flow, a
magnetic field is produced. The magnetic force induces a change in voltage.
8. Grounding: assures transmission of electrical signals without interference from
electromagnetic radiation from other transmission lines and equipment. This
interference, called crosstalk, can happen from adjacent lines, motors, PCs, lights
and other devices.
9. Grounding electrode: Connection to the electrode should be less than 1 ft below
the surface of the solid and the electrode should extend at least 10 ft below
ground.
10. Ground Loop: Causes a current to flow in the low resistance of the shield
resulting in electromagnetic waves that are picked up as noise through the wire.
11. 66 block: A punchdown block that terminates 22 to 26 AWG solid copper wire.
The 25 pair standard non split 66 block contains 50 rows.
12. 110 block: To terminate on-premises wiring in structured cabling. IDC or
Insulation displacement contact connector is used to terminate the twisted pair. The
110 allows for a much higher density of terminations, less crosstalk and higher
bandwidth data.
1/8
, .
13. UF: Cable can be buried into the ground. Not approved for commercial use in
NM. 340.10
14. Balun: A means of matching an unbalanced antenna or transmission line to a
balanced transmission line or antenna (Usually have a transformer in them)
15. Bus Topology: All nodes are connected to a single shared communication
line
16. Ring Topology: Topology where the computers are connected on a loop or
ring.
17. Star Topology: A topology with one central node that has each computer or
network device attached to the central node. All data first goes into the central node
and then is sent out to its destination.
18. Transducer: A device that converts energy from one form to another
19. Crossover: Divide an output into separate circuits each covering a specific
band or frequency range.
20 inverse square law: Each doubling of distance from the sound source results
in a fourfold reduction of sound power (equal to 6db). If one moves 4' to 8' from a
sound source, the level is reduced by 6 db. Double the distance to 16' and the
level is reduced another 6db to 12 db.
21. Dry Contact Devices: Normally open switch which close on activation and
creates and alarm. Pull stations, heat detectors, four wire smoke detectors,
sprinkler supervisory switches.
22. Conventional Fire Systems: Two types of zones. Initiating and Notification
zones. The number of initiating zones defines how large the system can be.
Most conventional zones use a two-wire scheme and end of line resistor for
supervision or IDC.
23. IDC: Initiating Device Circuit. The IDC connects an auto or manual initiating
device to a zone or a monitoring module.
24. NFPA 72 coverage area for a single zone?: Does not exceed 20,000 square
feet and does not extend beyond a floor of a building.
2/8
