Podcast
Questions and Answers
The use of Chapter 9, Table 1 for conduit fill allows the use of which additional tables in the notes to Table 1?
The use of Chapter 9, Table 1 for conduit fill allows the use of which additional tables in the notes to Table 1?
Tables 4, 5, 5A, and 8
Fill requirements for rigid metal conduit are addressed in Section 344.22. This section refers the user to Chapter 9, Table 1.
Fill requirements for rigid metal conduit are addressed in Section 344.22. This section refers the user to Chapter 9, Table 1.
True (A)
Tables 11(A) and 11(B) are designed as information when dealing with which systems?
Tables 11(A) and 11(B) are designed as information when dealing with which systems?
Class 2 and Class 3 AC and DC wiring
Tables 12(A) and 12(B) are designed as information when dealing with what?
Tables 12(A) and 12(B) are designed as information when dealing with what?
The information in the Annexes of the NEC is enforceable by AHJ.
The information in the Annexes of the NEC is enforceable by AHJ.
The tables in Annex C are to be used only when?
The tables in Annex C are to be used only when?
The percentage to use for conduit fill when installing one cable assembly with five conductors in the cable assembly is?
The percentage to use for conduit fill when installing one cable assembly with five conductors in the cable assembly is?
When calculating the number of 10 AWG conductors that may be installed in a raceway, when the calculation results in a decimal of what or greater, the calculated number can be rounded up to the next whole number?
When calculating the number of 10 AWG conductors that may be installed in a raceway, when the calculation results in a decimal of what or greater, the calculated number can be rounded up to the next whole number?
When installing six conductors in a nipple between boxes, what fill shall be permitted to be used?
When installing six conductors in a nipple between boxes, what fill shall be permitted to be used?
How many 10 AWG THHN conductors may be installed in a one-inch EMT conduit?
How many 10 AWG THHN conductors may be installed in a one-inch EMT conduit?
What is 60% of the cross-sectional area of a one-inch EMT conduit?
What is 60% of the cross-sectional area of a one-inch EMT conduit?
What is the cross-sectional area of a 10 AWG THHN stranded copper conductor?
What is the cross-sectional area of a 10 AWG THHN stranded copper conductor?
How many 10 AWG THHN copper conductors may be installed in a one-inch EMT nipple 12 inches long?
How many 10 AWG THHN copper conductors may be installed in a one-inch EMT nipple 12 inches long?
What is the minimum bending radius of one-inch EMT conduit using a hand bender?
What is the minimum bending radius of one-inch EMT conduit using a hand bender?
What UL standard number covers ground-fault circuit interrupters?
What UL standard number covers ground-fault circuit interrupters?
Where all of the conductors are the same size, which table in Annex C covers intermediate metal conduit?
Where all of the conductors are the same size, which table in Annex C covers intermediate metal conduit?
Using the forward reach requirements, if a switch is installed on the wall above a countertop that protrudes 22 inches from the wall, what is the maximum height allowed for the switch according to the 2010 ADA standards?
Using the forward reach requirements, if a switch is installed on the wall above a countertop that protrudes 22 inches from the wall, what is the maximum height allowed for the switch according to the 2010 ADA standards?
In the absence of manufacturer's torque recommendations, what may be used?
In the absence of manufacturer's torque recommendations, what may be used?
For a critical operations power system using 8,760 hours for a typical year, a system with an availability of 0.9999 will have a maximum downtime of what?
For a critical operations power system using 8,760 hours for a typical year, a system with an availability of 0.9999 will have a maximum downtime of what?
What is the maximum number of 12 AWG THHN conductors that can be installed in 3/8-inch FMC, where the fitting is on the outside of the conduit? Include an equipment grounding conductor.
What is the maximum number of 12 AWG THHN conductors that can be installed in 3/8-inch FMC, where the fitting is on the outside of the conduit? Include an equipment grounding conductor.
When installing four conductors in a rigid metal raceway with a sealing fitting such as those found in a Class 1, Division 1 location, what percentage of conduit fill is permitted?
When installing four conductors in a rigid metal raceway with a sealing fitting such as those found in a Class 1, Division 1 location, what percentage of conduit fill is permitted?
Flashcards
Conduit Fill Table References
Conduit Fill Table References
Chapter 9, Table 1 allows using additional tables like Tables 4, 5, 5A, and 8.
Rigid Conduit Fill
Rigid Conduit Fill
Section 344.22 (Rigid Metal Conduit) refers to Chapter 9, Table 1 for fill requirements.
Class 2 and 3 Wiring
Class 2 and 3 Wiring
Tables 11(A) and 11(B) cover rules for Class 2 and Class 3 AC and DC wiring systems.
Power-Limited Fire Alarm Wiring
Power-Limited Fire Alarm Wiring
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NEC Annexes and Enforceability
NEC Annexes and Enforceability
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Annex C - Conduit Fill with Same-Sized Conductors
Annex C - Conduit Fill with Same-Sized Conductors
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Conduit Fill Percentage
Conduit Fill Percentage
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Rounding Up Conduit Fill Capacity
Rounding Up Conduit Fill Capacity
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Nipple Fill Exception
Nipple Fill Exception
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EMT Conduit Capacity
EMT Conduit Capacity
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EMT Cross-Sectional Area
EMT Cross-Sectional Area
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THHN Conductor Area
THHN Conductor Area
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Nipple Capacity
Nipple Capacity
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EMT Bending Radius
EMT Bending Radius
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GFCI Safety Standard
GFCI Safety Standard
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ADA Switch Height Limit
ADA Switch Height Limit
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Torque Guidance
Torque Guidance
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System Availability and Downtime
System Availability and Downtime
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FMC Conductor Limit
FMC Conductor Limit
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Class 1 Division 1 Conduit Fill
Class 1 Division 1 Conduit Fill
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Study Notes
NEC Chapter 9: Tables and Informative Annexes Overview
- Chapter 9, Table 1 for conduit fill permits the use of additional tables including Tables 4, 5, 5A, and 8.
- Rigid metal conduit fill requirements are specified in Section 344.22, linking to Chapter 9, Table 1 for enforcement.
- Tables 11(A) and 11(B) address Class 2 and Class 3 AC and DC wiring systems.
- Tables 12(A) and 12(B) provide information related to PLFA (Power-Limited Fire Alarm).
Annexes and Non-Enforceability
- Information in NEC Annexes is not enforceable by the Authority Having Jurisdiction (AHJ).
- Annex C tables are applicable only when all conductors in the raceway are of the same size.
Conduit Fill Calculations
- For one cable assembly with five conductors, the conduit fill percentage is 53%.
- When calculating 10 AWG conductor capacity in a raceway, if results yield a decimal of 0.8 or greater, round up to the next whole number.
- For a nipple between boxes containing six conductors, standard fill regulations are not applicable.
Conductor and Conduit Specifications
- A one-inch EMT conduit accommodates a maximum of 16 10 AWG THHN conductors.
- 60% of the cross-sectional area for a one-inch EMT conduit equals 0.519 in².
- The cross-sectional area of a 10 AWG THHN stranded copper conductor measures 0.0211 in².
- In a one-inch EMT nipple measuring 12 inches, 24 10 AWG THHN copper conductors can be installed.
Bending Radius and Standards
- The minimum bending radius for a one-inch EMT conduit with a hand bender is 5.75 inches.
- Ground-fault circuit interrupters fall under UL standard number UL 943.
Additional Tables in Annex C
- Intermediate metal conduit specifications when all conductors are the same size are detailed in Table C.4.
Height and Torque Standards
- According to 2010 ADA standards, a switch above a countertop extending 22 inches from the wall cannot exceed a height of 44 inches.
- In the absence of manufacturer's torque recommendations, refer to Annex I for guidance.
System Availability and Installation Limits
- For critical operations power systems using 8,760 hours in a year, a system with 0.9999 availability experiences no permissible downtime.
- A maximum of 3 12 AWG THHN conductors can be installed in 3/8-inch FMC when an equipment grounding conductor is included.
- In rigid metal raceways with sealing fittings in Class 1, Division 1 locations, 25% conduit fill is allowed for four conductors.
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Description
Test your knowledge of NEC Chapter 9, which focuses on tables related to conduit fill and other relevant information. This quiz covers definitions and concepts related to Tables 1, 4, 5, 5A, and 8 in the chapter. Perfect for electrical professionals seeking to reinforce their understanding.
