Week 4
When calculating load household cooking appliances rated over ____ kW should be included.
1.75
A drip loop's lowest point has a minimum vertical clearance of ____ ft.
10
Electric heating loads including associated motors are calculated at ___% of the total connected load.
100
Each laundry branch cicuit is calculated at no less than ____ volt amperes
1500
The maximum distance to any receptacle measured horizontally along the wall line is ____ in.
24
The vertical clearance above the roof level must be maintained for a distance of at least _____ft from all edges of the roof.
3
If each feeder is 100 amperes the minimum conductor size is ______
4 AWG copper (or 2 AWG aluminum)
A clothes dryer neutral load on a feeder is calculated at ____%
70
Conductors must have ____ and sufficient a ampacity to carry the current for the load as calculated
Adequate mechanical strength
Each occupant must have ready access to ____ protecting the conductors supplying that occupancy.
All overcurrent devices
When calculating appliance load in a one family dwelling ____ should be used
Compliance ratings
The conductor voltage that is dropped is a percentage of the source voltage and can be calculated by ______
Dividing voltage drop by the source voltage
Kitchen receptacles not serving countertops such as receptacles behind refrigerators ____ unless they are installed within 6 ft of the outside edge of the sink
Do not require GFCI protection
Derating is allowed for a total of four or more _____
Fastened-in place appliances
All 125 volt single phase 15 and 20 ampere dwelling unit outdoor receptacles use have -------
GFCI protection
All 15 or 20 ampere general use receptacle outlets except for small appliance and laundry are considered part of the ______
General lighting load
The higher the resistance through a conductor the _______
Higher the voltage
On long runs it may be necessary to _______ to compensate for voltage drop
Increase the branch-circuits conductors size
If the load requirements of a single phase installation are greater than the serving agency normally supplies through one service ____ are permitted.
Multiple services
A heat pump with supplementary heat is ____
Not considered a noncoinicident load
A minimum of ____ wall switch controlled lighting outlet is are required for dwelling hallways.
One
A load calculation on an individual unit in a multifamily dwelling must be calculated in accordance with one of the ____ methods
One family dwelling load-calculation
General receptacle installation provisions for multifamily dwellings are almost identical to those who for ______
One family dwellings
Service conductors supplying a building(or other structure) shall not _______
Pass through the interior of another building
The conductors and equipment that deliver energy from the electricity supply system to the wiring system of the premises are called the _____
Service
In a multiple occupancy building each occupant must have access to the unit's _______
Service disconnecting means
______ is defined as the underground conductors between the utility electric supply system and the service point
Service lateral
No more than ____ disconnects per service can be grouped In one location.
Six
____ is the maximum number of disconnects per service grouped in any one location.
Six
Skin effect and induction change the resistance in alternating current (ac) circuits therefore resistance of a conductor is _____
Slightly higher in a ac circuit
When calculating load the ____ can be omitted as long as they are never energized simultaneously
Smaller of two ( or more ) no coincident loads
The larger the circular mil area of a conductor the ________
Smaller the resistance
All electric equipment must be _____ to allow ready and safe equipment operation and maintenance
Surrounded by sufficient unobstructed space
Dwelling unit branch circuits shall supply only loads within or associated only with _____
That dwelling unit
The service disconnecting means for a one family dwelling load calculation must have a rating of at least _______
The calculated load
A multifamily dwelling is a building containing ____ dwelling units
Three or more
A single phase feeder or branch circuit conductor will have a total resistance ______ that of one conductor
Twice
The term appliance designates _______ equipment installed as a unit to perform specific function.
Utilization
Voltage drop in a single phase circuit can also be found using the formula ________.
Voltage=2XRXLXI
