| Home Lighting | Definitions Motors |
|---|
What is a unit of an electrical system that carries or control electric energy as its principal function?
| Term Ampacity The Current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperatur rating Definition Ampacity | Term A unit of an electrical system that carries or controls electric energy as its principal function Definition Device |
|---|
What is the term used to describe an enclosure constructed so that dust will not enter under specified test conditions?
Dusttight
.
Enclosures
constructed so that the dust will not enter under specified test conditions. Dwelling Unit. A single unit, providing complete and independent living facilities, for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
What is defined as a load where the maximum current is expected to continue for 3 or more hours?
A continuous duty motor is treated as
a continuous load
, a load where the maximum current is expected to continue for three hours or more. Continuous loads have a multiplier of 125% applied when sizing branch circuits and overcurrent protection.
What is the point on a wiring system called that takes current to supply utilization equipment?
Outlet
. A point on the wiring system at which current is taken to supply utilization equipment. Overcurrent. Any current in excess of the rated current of equipment or the ampacity of a conductor.
How many volts is something that is grounded?
Systems
less than 50 volts
have to be grounded, where supplied by a transformer that is supplied (on the primary side) by greater than 150 volts. 2. Systems less than 50 volts have to be grounded, where supplied by a transformer, if the transformer is supplied (on the primary side) by an ungrounded electrical system.
What is the best conductor of electricity?
The best conductor of electricity is
pure silver
, but to no surprise, it is not one of the most commonly used metals to conduct electricity.
What are the causes of over current?
Possible causes for overcurrent include
short circuits, excessive load, incorrect design, an arc fault, or a ground fault
. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks.
What is a point on the wiring system?
A point on the wiring system
at which current is taken to supply utilization equipment
. … Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault.
What is the load connection?
The line side of an outlet is where you connect the incoming source power. The load side is
where the power leaves the device (or electrical box) and travels down the circuit
.
How many hours is considered a continuous load?
Because the term “continuous load” is in more than one article in the NEC, the definition is in Article 100. It is a load where the maximum current is expected to continue for
three hours or more
. Continuous load provisions pertain to branch circuits, feeders and services.
What devices are going to use to prevent overcurrent?
Examples of overcurrent protection devices are many:
fuses, electromechanical circuit breakers, and solid state power switches
. They are utilized in every conceivable electrical system where there is the possibility of overcurrent damage.
At what point is a load deemed continuous?
A continuous load is any load that
is capable of operating for three hours or more with demand factors that are considered less than one
.
What type of branch circuit supplies two or more receptacles or outlets for lighting and appliances?
A general-purpose branch circuit
supplies a number of outlets for lighting and appliances. This type of circuit supplies lights, receptacles, appliances, or any combination thereof.
Is a portion of a wiring system extending beyond the final overcurrent device protecting the circuit?
Branch circuit
: The portion of a wiring system extending beyond the final overcurrent device protecting a circuit. … Feeder: A circuit, such as conductors in conduit or a cable run, that carries current from the service equipment to a subpanel or a branch circuit panel or to some point in the wiring system.
What is considered concealed wiring?
CONCEALED. Rendered inaccessible by the structure or fin- ish of the building.
Wires in concealed raceways
are considered concealed, even though they may become accessible by with- drawing them [see “Accessible (As applied to wiring meth- ods)”]. Bare.
