1.What is ―accessible‖ as applied to wiring methods?
Wiring that is readily available to inspection, repair, removal, etc., without
disturbing the building structure or finish. Not permanently enclosed by the
structure or finish of buildings.
1. What is ―accessible‖ as applied to equipment?
Equipment that may be readily reached without climbing over obstacles or that is
not in locked or other hard to reach areas. For example, panel boards in kitchen
cabinets that are mounted in or on the walls above washers and dryers, or in
closets or bath- rooms, are not accessible. Service-entrance equipment that can
be reached only by going into a closet, behind a stairway, or around some other
obstacle would not be considered accessible.
2. What does ―ampacity‖ mean?
The amount of flowing current (in amperes) that a conductor can carry
continuously for specific use conditions and not exceed the temperature rating of
the conductor
3. What does ―dead front‖ mean?
No live (energized) parts are exposed where a person operates electrical
equipment.
,4. What does ―approved‖ mean?
Any appliance, wiring material or other electrical equipment that is acceptable to
the enforcing authorities. Underwriters Laboratory is (by far) the most acceptable
authority to inspectors.
5. What does ―identified‖ mean as applied to equipment?
It means that the equipment will be suitable for the particular use or environment,
that it has been evaluated by a qualified electrical testing organization, and that it
features a product listing or label indicating its suitability
6. What is a branch circuit?
A branch circuit is the portion of a wiring system that extends beyond the last
overcurrent-protective device. In interpreting this, you must not consider the
thermal cutout or the motor overload protection as the beginning of the branch
circuit. The branch circuit actually begins at the final fusing or circuit-breaker
point where the circuit breaks off to supply the motor.
7. What is a small appliance branch circuit?
This is the circuit supplying one or more outlets connecting appliances only.
There is no permanently connected lighting on this circuit, except the lighting that
,may be built into an appliance. Refer to outlets for small appliance loads in
kitchens, laundries, pantries, and dining and breakfast rooms of dwellings.
8. What is a general purpose circuit?
This is a branch circuit to which lighting and/or appliances may be connected.
9. What is a multiwire branch circuit?
A multiwire branch circuit has two or more ungrounded conductors with a
potential difference between them and also has a grounded (neutral) conductor
with an equal potential difference between it and each of the other wires.
Examples are a three- wire 120/240-volt system or a 120/208-volt wye system,
using two-or three-phase conductors and a grounded conductor. However, in
either case, the ―hot‖ wires must not be tied to one phase but must be connected
to different phases to make the sys- tem a multiwire circuit
10. What is a circuit breaker?
A device that is designed not only to open and close a circuit nonautomatically
but also to open the circuit automatically at a predetermined current-overload
value. The circuit breaker may be thermally or magnetically operated. However,
ambient temperatures affect the operation of the thermally operated type, so that
the trip value of the current is not as stable as with the magnetic type.
11. What is a current-carrying conductor?
A conductor that is expected to carry current under normal operating conditions.
12. What is a noncurrent-carrying conductor?
One that carries current only in the event of a malfunction of equipment or wiring.
An equipment grounding conductor is a good example. It is employed for
protection and is quite a necessary part of the wiring system, but it is not used to
carry current except in the case of faulty operation, where it aids in tripping the
overcurrent-protective device.
13. What is a pressure connector (solderless)?
A device that establishes a good electrical connection between two or more
conductors by some means of mechanical pressure. A pressure connector is
used in place of soldering connections and is required to be of an approved type.
14. What is meant by ―demand factor‖?
This is the ratio between the maximum demand on a system or part of a system
and the total connected load on the same sys- tem or part of the system.
15. What is meant by ―explosionproof apparatus‖?
Apparatus enclosed in a case that is able to sustain an explo- sion that may
occur within the case and is also able to prevent ignition of specified gases or
vapors surrounding the enclosure caused by sparks, flashes, or explosion of the
gases or vapors
, 16. What is a feeder?
The circuit conductors between the service equipment, or the source of a
separately derived system, and the final branch- circuit overcurrent device or
devices. Generally, feeders are com- paratively large in size and supply a feeder
panel, which is composed of a number of branch-circuit overcurrent devices
17. What is a fitting?
A mechanical device, such as a locknut or bushing, that is intended primarily for
a mechanical, rather than an electrical, function.
18. What is meant by a ―ground‖?
An electrical connection, either accidental or intentional, that exists between
an electrical circuit or equipment and the earth, or some other conducting body
that serves in place of the earth.
19. What does ―grounded‖ mean?
Connected to the earth or to some other conducting body that serves in place of
the earth.
20. What is a grounded conductor?
A system or circuit conductor that has been intentionally grounded.
21. What is a grounding conductor?
A conductor that is used to connect equipment, devices, or wiring systems with
grounding electrodes.
22. What is a grounding conductor (equipment)?
The conductor used to connect noncurrent-carrying metal parts of equipment,
raceways, and other enclosures to the system grounding conductor at the service
and/or the grounding electrode conductor.
23. What is a grounding electrode conductor?
A conductor used to connect the grounding electrode to the equipment grounding
conductor and/or to the grounded conductor of the circuit at the service.
24. What is a dwelling unit?
A dwelling unit includes one or more rooms used by one or more persons, with
space for sleeping, eating, living, and a permanent provision for cooking and
sanitation.
25. What is an outlet?
A point in the wiring system at which current is taken to supply some equipment.
Wiring that is readily available to inspection, repair, removal, etc., without
disturbing the building structure or finish. Not permanently enclosed by the
structure or finish of buildings.
1. What is ―accessible‖ as applied to equipment?
Equipment that may be readily reached without climbing over obstacles or that is
not in locked or other hard to reach areas. For example, panel boards in kitchen
cabinets that are mounted in or on the walls above washers and dryers, or in
closets or bath- rooms, are not accessible. Service-entrance equipment that can
be reached only by going into a closet, behind a stairway, or around some other
obstacle would not be considered accessible.
2. What does ―ampacity‖ mean?
The amount of flowing current (in amperes) that a conductor can carry
continuously for specific use conditions and not exceed the temperature rating of
the conductor
3. What does ―dead front‖ mean?
No live (energized) parts are exposed where a person operates electrical
equipment.
,4. What does ―approved‖ mean?
Any appliance, wiring material or other electrical equipment that is acceptable to
the enforcing authorities. Underwriters Laboratory is (by far) the most acceptable
authority to inspectors.
5. What does ―identified‖ mean as applied to equipment?
It means that the equipment will be suitable for the particular use or environment,
that it has been evaluated by a qualified electrical testing organization, and that it
features a product listing or label indicating its suitability
6. What is a branch circuit?
A branch circuit is the portion of a wiring system that extends beyond the last
overcurrent-protective device. In interpreting this, you must not consider the
thermal cutout or the motor overload protection as the beginning of the branch
circuit. The branch circuit actually begins at the final fusing or circuit-breaker
point where the circuit breaks off to supply the motor.
7. What is a small appliance branch circuit?
This is the circuit supplying one or more outlets connecting appliances only.
There is no permanently connected lighting on this circuit, except the lighting that
,may be built into an appliance. Refer to outlets for small appliance loads in
kitchens, laundries, pantries, and dining and breakfast rooms of dwellings.
8. What is a general purpose circuit?
This is a branch circuit to which lighting and/or appliances may be connected.
9. What is a multiwire branch circuit?
A multiwire branch circuit has two or more ungrounded conductors with a
potential difference between them and also has a grounded (neutral) conductor
with an equal potential difference between it and each of the other wires.
Examples are a three- wire 120/240-volt system or a 120/208-volt wye system,
using two-or three-phase conductors and a grounded conductor. However, in
either case, the ―hot‖ wires must not be tied to one phase but must be connected
to different phases to make the sys- tem a multiwire circuit
10. What is a circuit breaker?
A device that is designed not only to open and close a circuit nonautomatically
but also to open the circuit automatically at a predetermined current-overload
value. The circuit breaker may be thermally or magnetically operated. However,
ambient temperatures affect the operation of the thermally operated type, so that
the trip value of the current is not as stable as with the magnetic type.
11. What is a current-carrying conductor?
A conductor that is expected to carry current under normal operating conditions.
12. What is a noncurrent-carrying conductor?
One that carries current only in the event of a malfunction of equipment or wiring.
An equipment grounding conductor is a good example. It is employed for
protection and is quite a necessary part of the wiring system, but it is not used to
carry current except in the case of faulty operation, where it aids in tripping the
overcurrent-protective device.
13. What is a pressure connector (solderless)?
A device that establishes a good electrical connection between two or more
conductors by some means of mechanical pressure. A pressure connector is
used in place of soldering connections and is required to be of an approved type.
14. What is meant by ―demand factor‖?
This is the ratio between the maximum demand on a system or part of a system
and the total connected load on the same sys- tem or part of the system.
15. What is meant by ―explosionproof apparatus‖?
Apparatus enclosed in a case that is able to sustain an explo- sion that may
occur within the case and is also able to prevent ignition of specified gases or
vapors surrounding the enclosure caused by sparks, flashes, or explosion of the
gases or vapors
, 16. What is a feeder?
The circuit conductors between the service equipment, or the source of a
separately derived system, and the final branch- circuit overcurrent device or
devices. Generally, feeders are com- paratively large in size and supply a feeder
panel, which is composed of a number of branch-circuit overcurrent devices
17. What is a fitting?
A mechanical device, such as a locknut or bushing, that is intended primarily for
a mechanical, rather than an electrical, function.
18. What is meant by a ―ground‖?
An electrical connection, either accidental or intentional, that exists between
an electrical circuit or equipment and the earth, or some other conducting body
that serves in place of the earth.
19. What does ―grounded‖ mean?
Connected to the earth or to some other conducting body that serves in place of
the earth.
20. What is a grounded conductor?
A system or circuit conductor that has been intentionally grounded.
21. What is a grounding conductor?
A conductor that is used to connect equipment, devices, or wiring systems with
grounding electrodes.
22. What is a grounding conductor (equipment)?
The conductor used to connect noncurrent-carrying metal parts of equipment,
raceways, and other enclosures to the system grounding conductor at the service
and/or the grounding electrode conductor.
23. What is a grounding electrode conductor?
A conductor used to connect the grounding electrode to the equipment grounding
conductor and/or to the grounded conductor of the circuit at the service.
24. What is a dwelling unit?
A dwelling unit includes one or more rooms used by one or more persons, with
space for sleeping, eating, living, and a permanent provision for cooking and
sanitation.
25. What is an outlet?
A point in the wiring system at which current is taken to supply some equipment.
