Chapter 1 Article 100 A Flashcards
The authority having jurisdiction has the responsibility of
1- Making interpretations of rules
2- for deciding upon the approval of equipment and materials
3- waiving specific requirements in the code, permitting alternate methods if safety is maintained
90.3 C. 90.4
The words “Shall” and “Shall Not”, in the NEC means?
A mandatory requirement.
90.5 A
The word
“Shall be Permitted” means
the identification of actions that are allowed but it is nat required in NEC.
90.5 B
The code specify that one equipment shall be “in sight from”, within sight from” or “within sight of” and so forth, another equipment, the specified equipment is to be visible and not more than ___________
50 Ft distant from the other
Article 100 Definition
On a 4-wire, delta-connected system where the mid point of one phase winding’s grounded, only the conductor or busbar having the higher voltage to ground shall be durably and permanently marked by an outer finish that is ___________ in color or by other effective means.
Such identification Shall be placed at each point on the system where a connection is made if the grounded conductor is also present.
Orange Color
The required working space for access to live parts operating at 300volts to ground, where there are exposed live parts on one side and grounded parts on the other side is
3 1/2 ft =42 inches
110.26 table condition # 2
The dimensions of working space for access to live parts operating 300 volts nominal to ground, where there are exposed live parts on both sides of the workspace is
4 ft
110.26 conduction #3
The working space for 150 volts or less, in any the condition named in table 110.26 will be
3 ft all condition
Table 110.26
Article 300
Wiring Methods
Wiring Methods
Cover all wiring Installations, Raceways,Wiring, Voltages up to 600 nominal volts
Armored Cable, Type AC. A fabricated assembly of insulated conductors in a flexible metallic enclosure. See 320.100 for construction
The Trade Name is _________
BX. trade name
which cable have an armor
of flexible metal tape and shall have an INTERNAL BONDING
STRIP of COPPER OR ALUMINUM in intimate contact with the
armor for its entire length.
AC cable is construction
The AC cable is use permitted
(1) For feeders and branch circuits in both exposed and
concealed work
(2) In cable trays
(3) In dry locations
(4) Embedded in plaster finish on brick or other masonry,
except in DAMP OR WET LOCATIONS
(5) To be run or fished in the air voids of masonry block or
tile walls where such walls are not exposed or subject
to excessive moisture or dampness
Uses NOT Permitted for Type AC Cable
320.12 Uses Not Permitted. Type AC cable shall not be
used as follows:
(1) Where subject to physical damage
(2) In damp or wet locations
(3) In air voids of masonry block or tile walls where such
walls are exposed or subject to excessive moisture or
dampness
(4) Where exposed to corrosive fumes or vapors
(5) Embedded in plaster finish on brick or other masonry
in damp or wet locations
Bending Radius. Bends in Type AC cable shall be
five times the diameter of the Type AC cable.
Supporting the AC Cable shall not be more than ____
(41⁄2 ft).
320.30 Supporting.
AC Cable shall be supported with
320.30 Securing and Supporting.
(A) General. Type AC cable shall be supported and secured by staples, cable ties, straps, hangers, or similar fittings, designed and installed so as not to damage the cable.
320.30 Securing
AC cable shall be secure with ….
Type AC cable
shall be secured within 12 in. of every outlet box, junction box, cabinet, or fitting and at intervals not
exceeding 41⁄2 ft. where installed on or across framing members.
Where we can install or what is the designed for the
Flat Conductor Cable: ( Type FCC Cable)
Type FCC ( flat conductor cable )
is designed to use it under carpet
squares
FCC Cable used permitted
Branch Circuits
Only in Commercial applications
(A) Branch Circuits, for general-purpose and appliance branch circuits
and for individual branch circuits.
FCC Cable Branch Circuits Ratings
(2) Current. General-purpose and appliance branch circuits shall have ratings not exceeding 20 amperes.
INDIVIDUALS branch circuits shall have ratings not exceeding 30. amperes.
324.12 Uses Not Permitted. FCC systems shall not be
used in the following locations:
(4) In residential, school, and hospital buildings
1) Outdoors or in wet locations
(2) Where subject to corrosive vapors
(3) In any hazardous (classified) location
(4) In residential, school, and hospital buildings
Type AC Cable
Armored Cable
Type FCC
Flat Conductor Cable
Type FCC Cable
Flat Conductor Cable
Type IGS Cable
Integrated Gas Spacer Cable
Type MV Cable
Medium Voltage Cable
Rate only for 2001 To 35,000 nominal volts
Article 402 Fixture Wires
One of the requirement is that NOT Fixture wires can be Smaller than ______
18 AWG
Fixture Wires MUST be of a type listed in Table 402.3 and should be comply with all the requirements ln the table.
A lot of them but all have a letter F
TFFN
FFN-2
HF
XF
ETC. And all good for voltage of 600 V nominal
90.1 Purpose of the NEC
1- Practical safeguarding
2- Adequacy
3- Intentention
320.30 Securing
AC cable shall be secured ….
320.30 Securing
B) Securing. Unless otherwise provided, Type AC cable shall be secured within
12 in of every outlet box, junction box, cabinet, or fitting and at intervals not exceeding 41⁄2 ft where installed on or across fram- ing members.
Surge arresters less than 1 kV are also known
as Type 1 SPDs.
Transient voltage surge suppressors (TVSSs) are also known as
Type 2 and Type 3 SPDs
285.23 Type 1 SPD Surge Arresters ( Surge Protective Divice 1 K or Less ) Type 1 SPD shall be installed in accordance with 285.23(A) and B. connected to the supply side of the service disconnect
as permitted in 230.82(4)
At the Service disconnect;
When installed at service disconnect, the GROUNDING
conductor of a Type 1 SPD, 1K or less, shall be connected to one of
the following:
(1) Grounded service conductor
(2) Grounding electrode conductor
(3) Grounding electrode for the service
(4). Equipment grounding terminal in the service equipment
Conductors Shall be installed within a raceway, cable, or enclosure.
True
300.3(A)
All Conductors of a circuit, including the grounded and equipment grounding conductors, shall be contained within the same _________, unless permitted elsewhere in the code.
Raceway, Cable, Trench
Conductors of AC and DC circuits, rated 600V or less, can occupy the same ________ provided that all conductors have an insulation rating equal to the maximum voltage applied to any conductor.
Enclosure, Cable, Raceway
Important Classification have to be the same
Class 1 or Class 2
Where direct buried conductors and cables emerge from grade, they shall be protected by enclosures or raceways to a point_______above finished grade. Test question
8 ft.
Direct-buried service conductors that are not encased in concrete and that are buried 18 in. or more below grade shall have their location identified by a warning ribbon placed in the trench at least________ above the underground installation.
12 in.
Direct-buried conductors or cables can be spliced or tapped without the use of splice boxes when the splice or tap is made in accordance with 110.14(B).
True
Backfill used for underground wiring shall not_________
Damage the wiring method
prevent compaction of the fill
contribute to the corrosion of the raceway
conduits or raceways through which moisture may contact live parts shall be ____________at either or both ends.
sealed
Plugged
When installing direct-buried cables, a ________shall be used at the end of a conduit that terminates underground
terminal fitting
bushing. 300.5H
All Conductors of the same circuit Shall be _________, unless otherwise specifically permitted in the Code
1- In the same raceway or cable
2- in close proximity in the same trench
Direct-buried conductors, cables, raceways, which are subject to movement by settlement or frost, shall be arranged to prevent damage to the _________ or to equipment connected to the raceways.
The enclosed conductors.
Cables or raceways installed using directional boring equipment Shall be ______ for this purpose.
Approved
Raceways, Cable trays, cables, auxiliary gutters, cable armor, boxes, cable seating,cabinets, elbows, couplings, fittings, support hardware shall be of materials suitable for _________. Test Question
the environment in which they are to be
Where corrosion protection is pessary for ferrous metal equipment and the conduit is threaded in the field, the threads Shall be coated with a(n) ________, electrically conductive, corrossion-resistant compound.
Approved
Which of the following metal parts Shall be protected from corrosion?
1- Ferrous metal raceways
2- Ferrous metal elbowa
3- Ferrous boxes
Aluminum Raceways, Cable trays, cablesbus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, nipples, fittings, supports, and support hardware ____________ shall be provided with supplementary corrosion protection.
1- embedded or encased in concrete
2- in direct contact with the earth
Nonmetallic raceways, cable trays, boxes, cables with a nonmetallic outer jacket, fittings, and support hardware shall be __________.
1- listed as sunlight resistant
2- identified as sunlight resistant
Where nonmetallic wiring methods are subject to exposure to chemical solvents or vapors, they shall be
inherently resistant to chemicals based upon their being
listed for the chemical
identified for the chemical
An exposed wiring system for indoor wet locations where walls are frequently washed shall be mounted so
that there is at least a
1/4 in. airspace
In general, areas where acids and alkali chemicals are handled and stored may present corrosive conditions,
particularly when wet or damp
True
Where portions of a cable raceway or sleeve are subjected to different temperatures and condensation is
known to be a problem, the
warm air to a colder section of the raceway or sleeve.
raceways
or sleeve
Raceways shall be provided with expansion fittings where necessary to compensate for thermal expansion
and contraction.
True
Raceways or cable trays containing electric conductors shall not contain any pipe or tube for steam, water,
air, gas, drainage, or any service other than
Electrical
Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered a __________ location.
Wet
Metal raceways, cable armors, and other metal enclosures shall be _______
joined together into a
continuous electric conductor so as to provide effective electrical continuity.
metallically
Heating Cables installed inPoured concrete
or masonry floors Shall not exceed ______ watts/linear foot of cable
161/2 watts/linear food of cable
424.44 (A)
Marking a heating cables should be identified 3inches from the terminal end.
1- 120V
2- 208V
3- 240V
4- 277V
5- 480V
1- Yellow. 120V
2- Blue. 208V
3- Red. 240 V
4- Brown 277V
5- Orange 480V
430.52. Branch-Circuit Short-Circuit and Ground-Fault Protective Devices
Circuit motor.
1 Time Fuse
Dual fuse
ITbreaker
Wound motors and DC motors wil be150%
Others motors
300%
175%
250%
for Circuit Breaker Rating in Motors ( not Wound or DC motors ) we shall multiply FLC (amps) times (X) __________.
motors we should Multiply 250% (2.5) times (X) the amp (FLC) of the motor
20Amps X 250% = 50 amps breaker
(Table 240.6 Breaker size)
For size wire in Motors ( not wound or DC )we multiply _______.
FLA. X 250 %
Standard Ampere Ratings. 📲 SIZES
(A) Fuses and Fixed-Trip Circuit Breakers. The standard ampere ratings for fuses and inverse time circuit breakers shall be considered __________. this is when I rounded
15, 20, 25, 30, 35, 40, 45,
50, 60, 70, 80, 90, 100, 110,
125, 150, 175, 200, 225, 250,
300, 350, 400, 450,
500, 600, 700, 800, 1000,
1200, 1600, 2000, 2500, 3000, 4000, 5000, and 6000 amperes.
Additional standard ampere ratings for fuses shall be ___________
1, 3, 6, 10, and 601.
The Total Voltage Drop Is_________?
The Total is 5% The Maximum in Feeders 3%. and BC (Branch Circuits ) 3%
Exemption In dewlling units. Can Be Feeder 4%. BC 1% for a Total 5%
X-Ray Installations, Long-Time Rating_________
5 Minutes or longer
X-Ray Installations, Momentary Rating _____________
Do Not exceed 5 Seconds
Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas WIRING METHODS
All Branch Circuits Shall Provided
EFFECTIVE GROUND-FAULT CURRENT PATH
Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas. PANEL BOARDS BONDING
BONDING panel boards Close by SHALL be CONNECTED TOGETHER With insulated Cooper conductor not less of 10 AWG
Chapter 9 Table 1. Fill % Conduits
1 wire 53%
2 wires 31%
over 2 wires. 40%
Nipple 24 inches or less 60%
24 inches or less nipple the wire Filling is _________
60%
calculating conduits fill
table 1 % fill
table 4 total area conduit
table 5 wire size and area sq/in. (in2)
Table 1
1 Wire 53%
2 Wires 31%
over 2 Wires 40%
24” nipple 60%
Table 4
Conduit size
Conduit Total Area
Conduit % area
Table 5
Wire Type
Wire size
Wire Area
Equipment Grounding ELECTRO NOT more that _______ size
3/0 size
Man Hole Cover UNDER 100 pounds Does not Required _________
tools
What side Circuit Breaker required for Portable X-ray ?
60 amps
What side Circuit Breaker required for Stationary X-ray ?
30 amps
For Air acondicionado calculating wire size amps times (X) 125 %
Yes
for- AC -calculating Branch Circuit Protection
Multiplier Amps times (X) 175% for breaker
for wire size 125%
The flexible cord for Room AC MUST not exceed ________ for 120V and __________ for 208V or 240V units.
10 FT. 120V units
6 Ft 240V units
MBJ (main bonding jumper) is at the _________
at the Service.
can be a Transformer or a Generator a separate dirives system
Yes but not a service
SBJ ( system Bonding Jumper ) is in a separately derive system
at the System and/or generator
For 3 Phase overcurrent protection I multiply 1.73
voltage X 1.73. (3 phase)
Basic formula find power ( watts) (VA)
P = E x I
Watts = Voltage x Amps
Basic formula to Find E. ( Voltage )
E = R x I
Voltage = Ohms (R) x I (Amps)
E= P / I
Voltage = Watts / Amps
For Transformers 9 Amps or more and get protection size we multiply _______
125% and go higher breaker if we don’t have the right size breaker
continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load multiply ________.
125 percent (x 1.25 )
when we come out of the secondary transformer those wires are considered _________
Feeders Conductors
for overcurrent protection you multiply by 125%
an Auto transformer is NOT a _______ system.
separately derived system
Transformers and Transformer Vaults (Including Secondary Ties)
The maximum temp Mechanical ventilation and/or air conditioning shall be provided _________ .
104°F ambient temperature in the room.
Transformers
Open Installations. Dry-type transformers 600 volts, nominal, or less, located in the open on walls, columns, or structures, shall not be required to be readily accessible
True
Table 1 conduit fill %
1 wire _____
2wire _______
Over 2wire ______
1 wire 53%
2 wires 31%
Over 2 wires 40%
24 inch or less nipple 60%
