1B Midterm
Where are metal wire away houses and protects conductors and where single conductor cables compromising each phase neutral or grounded conductor of alternating current circuit or connected in parallel as permitted in 310.10 H the conductor shall be installed in groups consisting of no more than _____conductors per phase neutral or a grounding conductor to prevent current imbalance in the paralleled conductors due ton inductive Reactance
1
Smooth sheath type MC cable with an external diameter not greater than 3/4 inch shall have a bending radius not less than ________[times the external diameter of the cable
10
Hand hole enclosures covers shell require the use of tools to open or they shall way over ______lbs
100
The current on the ground and conductor of a two wire circuit is _________of the current on the ungrounded conductor
100%
The electrical system usually begins at the generating plant that converts energy to_______ three phase power
13.8kv
According to the iEEE dictionary a neutral conductor has the same equal potential between eight and all unguarded conductors of a ________system
2 wire 3 wire
The sum of the cross-sectional areas of all contained conductors and cables are any cross-section of metal wire way shall not exceed _____percent of the interior cross-sectional area of the wire way
20
The sum of the cross-sectional areas of all contained conductors and cables at any cross-section of the metal wire way shall not exceed ________percent of the interior cross-sectional area of the wire way
20
type AC cable installed horizontally through wooden or metal framing members is considered supported were support does not exceed ________ft intervals
4 1/2.
Conductor power losses are directly proportional to the length of the conductor and the square of the current it's a current is double the power loss will be increased by _______percent
400%
The current in a short circuit type Park is limited by the system impedance and the importance of the arcing fall it's self typically at reciprocal fault current will be above 75A but only likely above_______
450 A
Four locations not specifically identified and table $300.05 a covert depth ________ of in Shelby permitted for pool spa and fell and lightning installed in a non-metallic raceway limited to no more than 30vwere part of a listed low-voltage lighting system
6
Armored cable used to connect recesses luminaires or equipment within an accessible ceiling can be unsupported an unsecured for links up too _______ ft
6 ft.
The impassively of type UF cable shall be that of conductors in accordance with 310.15
60° C
A step up sub station located at the generating facilities transformed the 13.8KV generator out Put to
69KV or higher
Type MC cable Shelby secured at intervals not exceeding ______ft
6ft
Type MC cable installed horizontally through wooden or metal framing members are considered secured and supported were such support does not exceed ______ ft intervals
6ft
Where direct bury conductors and cables emerge from grade they shall be protected by and closures or raceways to appoint at least !__________above finish grade
8 ft
We're RMC enters a box fitting or other enclosure shall be provided to protect the wire from abrasions unless the design of the box fitting or enclosure of far is equivalent protection
A bushing
Where RMC enters a box fitting or other enclosure shall be provided to protect the wiring from abrasion unless the design of the box fitting or enclosure affords equivalent protection
A bushing
type UF cable shall not be used
And any hazardous classified locations except as otherwise permitted in this code embedded in poured concrete or aggregate were exposed to direct rays of the sun and less identified as sun resistant
Bands and LFNC shall______ between two points
Be limited to 360°
All conductors of the same circuit including the grounded and equipment grounding conductor and bonding conductor shall be contained within the same ______unless otherwise permitted elsewhere in the code
Cable trench raceway
Wiring methods can be installed in a cable tray
Cable nonmetallic raceway metal raceway
Type AC cables are permitted in
Cable trays. expose installations.
The number of conductors permitted an ENT shall not exceed the percentage feel specified in
Chapter 9 table one
Extreme _______may cause PVC conduit to become brittle and therefore more susceptible to damage from physical contact
Cold
Galvanized steel stainless steel and red brass RMC elbows couplings and fittings shall be permitted to be installed in concrete in direct contact with the earth or an area subject severe corrosion influences we are protected by _________approved for the condition
Corrosion protection
Type MC cable listed for _______is permitted to be installed under ground under a building without insulation in a raceway
Direct burial
Multi outlet assembly can be installed in
Dry locations
Service medal raceway enclosures providing a transition from other wiring methods she'll have a means for connecting an ________conductor
Equipment grounding
When LFMC is used to connect equipment we're flexibility Is necessary to minimize the trans mission of vibration from equipment or equipment required remove insulation an__________ conductor shall be installed
Equipment grounding
type SE cable shall be permitted to be used for branch circuits or feeders were the installed conductors are used for circuit wiring and an insulated conductor is used only for________ purposes
Equipment grounding
Metal wire way she'll be permitted for
Expose work wet locations have listed for the purpose
A run of IMC shall not contain more than the equivalent of _________quarterbends between pull point such as conduit bodies and boxes
Four
Threadless couplings approved for use with IMC in wet location Shelby
I listed for wet locations
Cable trays and they're associated feeding Shall be _____ the intended use
Identified
Type TC cable shall be permitted to be direct buried where_______ for such use
Identified
Surface metal raceways an associate fittings shall be supported
In accordance with the manufacturers installation instructions
Type thicc cable shall not be
Installed where it will be exposed to physical damage Installed outside of a raceway or cable tray system unless permitted use were exposed direct rays of sun unless identified as sunlight resistant
_______Breakers operate on the principle of electromagnetictism only and are used for very large motors
Instantaneous trip
We're flexibility ___________liquid tight flexible metal conduit shall be permitted to be used as an equipment grounding conductor when installed in accordance with 250.118(6)
Is not required after installation
Cable ties used to secure and support LFNC shall be _________ as suitable for the application and for securing and supporting
Listed
When a building is supplied with and fire sprinkler system ENT shall be permitted to be used within the walls floors and ceilings exposed or concealed in buildings exceeding three floors above grade
NFPA 13- 2013
Type NM and type in MC cable shall be permitted in________except as prohibited in 334.12
One and two family dwellings and they're attached/detached garage and storage buildings Multi family dwellings permitted to be types 34 and five construction other structures permitted to be types 34 and five construction
High voltage transmission lines are usually connected to the transmission lines from other generating plants this is known as
Power system interconnected sister
Materials such as straps bolts screws and so forth where are associated with installation of IMC in wet locations Shelby
Protected against corrosion by corrosion resistant materials corrosion resistant
And industrial facilities were conditions of maintenance and supervision ensure that only qualified person's will service the installations cable tray systems can be used to support
Raceways cables boxes in conduit bodies
The total resistance of a parallel circuit can be calculated by the ________method
Reciprocal product over some equal resistance
Metal wire Waze or sheet metal tough with for housing and protecting electrical conductors and cable
Removable covers hinged covers
ENT shall not be used were exposed to direct rays of the sun unless identified as
Sunlight resistant
Type _____cables is a factor assembly of two or more insulated conductors with or without associated bare or covered grounding conductors under nonmetallic jacket
TC
EMT shall not be threaded
True
ENT is not permitted in hazardous classify locations unless permitted and other articles of the code
True
Kirchhoff voltage law states in a series circuit the sum of voltage drop across all of the resistors equals the applied voltage
True
Power distribution blocks installed in metal wire Waze on the line side of the service equipment Shall be Marked suitable for use on the line side of service equipment or equivalent equivalent
True
Pushing or adapter shall be provided at NT terminations to protect the conductors from abrasions unless the box fitting or enclosure design provide equivalent Protection
True
The cut ends of a PVC conduit she'll be trimmed to remove the birds and rough edges
True
Wiring message and equipment installed behind suspended ceiling panel shall be arranged and secure to allow access to electrical equipment
True
exposed runs of type AC cable can be installed on the underside of Joists were supported at each joists and located so it is not subject to physical damage
True
To help reduce the hazard of electrical fires from a parallel parking fault an EC requires a listed AFC I protection device to protect________ wiring and cooling unit bedrooms
branch circuits
According to the equal resistance method when all the resistances of the parallel circuit have the same resistance divide the resistance of an element by the largest resistor in parallel
false
Conductors larger than that of which the metal wire is designed can be installed in any metal wire way
false
The neutral conductor of a three wire 120 /208V or 277 /480 V circuit supplied from a four wire three face system never carries neutral current
false
There can never be variations in the formulas used or the order in which they are used for series circuit
false
Type UF cable can be used in commercial garage is
false
When installed under metal corrugated sheet roof decking cable raceways and enclosures are permitted and conceal locations of metal corrugated sheet decking tape roofing if they are at least 2 inches away from the structural support member
false
To remove dangerous touch voltage on a middle part from an _______the fault current path must have low impedance to allow the fall current too quickly rise to facilitate at the opening of the protection device
ground fault
Because of the dangers associated with an open grounded conductor the continuity of the ________conductor in a multi wire branch circuit cannot depend upon the reciprocal
grounded
Conductors in Farias Mill race Waze or enclosure she'll be arranged so as to avoid hitting the surrounding furious middle by alternating current induction to accomplish this the ____\conductor shall be grouped together
grounded equipment grounding phase
Conductors installed in a non-metallic raceway run underground shall be permitted to be arranged as ________installations the raceway shall be installed in close proximity and the conductors shall comply with provisions of 300.20 b
grounded conductor neutral isolated face
Type thicc cable shall not be
installed where it would be exposed to physical damage installed outside of a raceway or cable tray system and less permitted in 336.10 (4) 336.10 (7) 336.10 (9) and 336.10(10) Used were exposed to direct rays of the unless Identified as sunlight resistant
Type USE cable is not permitted for_____[ wiring
interior
For the purpose of 350.30 ________LFMC fitting she'll be permitted as a means of securement and support
listed
Type MC cable shall be supported and secured by Staples cable ties ________for securement and support straps hangers or similar fittings or other approved means designed and installed so as not to damage the cable
listed identified
We're cables or non-metallic raceways are installed support hose in Joyce rafters or what member whole Shelby board so that edge of the hole is __________nearest edge of the word member member
not less than 1 1/4 inch from
Because of the earths higher resistance to current flow it cannot be used for the purpose of clearing a line to case ground fault for ________wiring
premises
Materials such as straps bolts and so forth associated with the installation of RMC and wet locations Shall be
protected against corrosion by corrosion resistant materials corrosion resistant
EMT should not be used to wear
subject to physical damage Used for the support of luminaires except conduit bodies no laundry no larger than the largest trade size of the tube
A multi wire circuit has two or more ungraded conductors having a potential difference between them and having an equal difference of potential between each ungrounded conductor and grounding conductor neutral conductor
true
A parallel circuit has two or more paths and which current may flow
true
According to Kirchhoff's current law the total current provided by the source to a parallel circuit equal to the sum of the occurrence of all the branches
true
Bushings or other chapters shall be provided at ENT terminations to protect the conductors from abrasions unless a box sitting or in closer to sign provides equivalent protection
true
Metal multi outlet assemblies can pass through a dry partition provided no reciprocal is concealed in the partition and the cover of exposed per portion of the system can be removed
true
PVC conduit shall be permitted for exposed work were subject to physical damage if I didn't fight for such use
true
PVC conduit she'll be permitted for exposed at work were subject to physical damage if identified for such use
true
Resistance opposes the flow of electrons and series circuit the total circuit resistance is equal to the sum of all resistance and series
true
Resistance opposes the flow of electrons in a series circuit the total circuit resistance is equal to the sum of all resistance is in serious
true
Siri's art can occur when the conductor and serious with the load is unintentionally broken surgeries are at fault current is load limited
true
The advantage of the reciprocal method is that the formula can be used for as many resistances as the parallel circuit contains
true
The cuttings of a PVC conduit Shelby trim to remove the burrs and rough edges
true
The graded conductor is a conductor that is attentionally grounded to the earth
true
The opposition to current flow results in a voltage drop of circuit voltage
true
The portion of the series parallel circuit they contagious distances in parallel must comply with the rules of the parallel circuits
true
Unsafe arcing faults can occur in one of two ways as series arcing faults or as parallel arcing faults the most dangerous is the parallel arcing fault fault
true
When alternating current is applied to the primary of A transformer and induces a voltage in the secondary which causes electrons to leave one end of the transformers secondary through the load and return over the remaining circuit conductors to the transformer secondary
true
When working with series parallel circuit it is best to redraw the circuit so you can see the series components and the parallel branches
true
to calculate the total resistance of the circuit RT = R 1+ R2+ R 3
true
we're type TC cable is installed in one and two family dwelling units 7 to 5.136 provides rules for limitation on class two or three circuits contained within the same cable with conductors of electric light power or class one circuit
true
Surface metal raceway shall not be used
were subject to severe physical damage we're subject to corrosion vapors host ways
