Article 110 Flashcards
(T/F) Working space is required fro the back or sided of assemblies where all connections and all renewable or adjustable parts are accessible from the front
False
(Working spaces) Condition 1 is measured from the equipment to what?
Insulated Material
What does Article 110 cover?
Requirements for electrical installations
(T/F) The NEC prohibits sprinklers from spraying water on electrical equipment
False
(T/F) The working space of equipment can overlap the working space for other equipment
True
Unless marked otherwise, what is the AIC for circuit breakers and fuses?
CB’s = 5,000
Fuses = 10,000 AIC
Panelboards supplied by a 4-wire, delta-connected, three-phase system must have the high-leg conductor terminate to the _____ phase of a panelboard
B
(T/F) If the code requires a disconnect to be lockable in the open position, the provisions for locking must remain in place whether the lock is installed or not
True
In a high-leg system, the conductor with 208V to ground must be durably and permanently marked by an out finish _____ in color, or other effective means
Orange
Electrical equipment must have a short-circuit current rating that permits the circuit protective device to open from what?
Short Circuit or Ground Fault
Enclosures must be marked with what?
An enclosure-type number
The footprint space of electrical equipment extending from grade to a heigh of ____ feet above the equipment must be dedicated for the electrical installation.
6
(T/F) Sprinkler protection piping is permitted in the dedicated space
False
(T/F) Electrical raceways and cables not associated with the dedicated space can be within the dedicated space. These aren’t considered “equipment foreign to the electrical installation”
True
Service equipment, switchboards, switchgear, and panelboards, as well as motor control centers located indoors must have illumination located indoors controlled by ______ means.
Manual
Conductor sizes larger than ______ are expressed kcmil (thousand circular mills)
4/0
What is the current, in amperes, available at a given point in the electrical system called?
Available Short-Circuit Current
(T/F) Copper and aluminum conductors can make contact with each other in a device even if the device isn’t listed or identified for that purpose
False
The working space must be sufficient width, depth, and height to permit all equipment door to open _____ degrees
90
The height of the working space in front of equipment isn’t permitted to be less than _____ feet, measured from the grade, floor, platform, or the equipment height, whichever is ______.
6.5 , Greater
Is a dropped, suspended, or similar ceiling considered a structural ceiling?
No
When the conductor material is not specified in a rule, the sizes given in the NEC are based on a _______ conductor
Copper
The width of the working space must be a minimum of ____, but in no case less than the _____ of the quipment
30” , Width
(T/F) Conductors aren’t required to be twisted together prior to the installation of a twist-on wire connector, unless specifically required in the installation instructions
True
(Working spaces) Condition 2 is measured from the equipment to what?
Grounded Parts
What does AIC stand for?
Ampere Interrupting Capacity
Switches and receptacles marked _________ are designed to ensure a good connection through the use of a larger contact area and compatible materials
CO/ALR
The standard for meter equipment required the high-leg conductor (208V to neutral) to terminate on the _____ phase of the meter socket enclosure
C (right)
Equipment such as raceways, cables, wireways, cabinets, panels, and so on, can be located above or below electrical equipment, but must not extend more than ___ inches into the equipments working space
6
The voltage rating of electrical equipment isn’t permitted to be less than the ________ voltage of a circuit to which it’s connected
Nominal
Overcurrent protection devices such as circuit breakers and fuses are intended to ______ the circuit
Interrupt
What does AIR stand for?
Ampere Interrupting Rating
The NEC doesn’t specify the termination location for the high-leg conductor in switch equipment, but the generally accepted practice is to terminate this conductor to the _____ phase
B
Is an electrical equipment room or enclosure containing electrical apparatus controlled by a lock(s) considered accessible to qualified persons?
Yes
Dedicated space ______ the footprint of the equipment from the floor to ____ feet above the equipment or to the structural ceiling (whichever is lower)
Equal ; 6
(T/F) Working space is permitted for storage while not being worked on.
False
Working space is measured from the enclosure _____
Front
(Working spaces) Condition 3 is measured from the equipment to what?
Exposed Live Parts
Live parts of electrical equipment operating at ____ to _____ between ungrounded conductors must be guarded against accidental contact
50V ; 1,000V
Over current protection devices must have an interrupting rating at the _______ circuit voltage at least ______ to the current available at the line terminals of the equipment
Nominal ; Equal
The “high-leg” conductor is also sometimes called what?
Wild leg, stinger leg, or bastard leg
What is the reason copper and aluminum conductors shouldn’t be in contact with each other?
A corrosion develops between them due to galvanic action which results in increased contact resistance
The available short-circuit current is highest at what point in the electrical system?
Utility Transformer
(T/F) Foreign systems can be located above the dedicated space if protection is installed to prevent damage to the electrical equipment from condensation, leaks, or breaks in the foreign systems
True
