We are required to have either the AWG size or circular mil area since we have to know how large the cable is to figure out our ampacity. If we have a cable assembly where the neutral conductor is smaller than the ungrounded conductors, this information needs to be marked on the cable.
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What is required to be marked on electrical conductors and cables?
All conductors and cables shall be marked to indicate the following information, using the applicable method described in (b) below. The maximum rated voltage for which the conductor was listed. The proper type letter or letters for the type of wire or cable as specified elsewhere in this Code.
What are the basic requirements of conductors?
Even in the design of a simple single insulated wire many factors must be considered: temperature, voltage, DC resistance of the conductor, insulation, O.D., required flexibility, physical properties of the conductor (tensile strength, voltage drop, conductivity, weight) and when necessary, specific electrical
How do you identify a conductor?
Conductor identification may take the form of different colors, different colors with stripes or conductor numbers imprinted on the insulation. Most of the time these number imprinted conductors have the same color for all the conductors, in addition they may have one green and/or green with yellow stripe.
What information must be marked on the tag attached to the coin reel or carton containing a flexible cord?
Flexible cords and cables will be marked by means of a printed tag attached to the coil reel or carton. The tag will contain the information required in section 310.120(A). Required markings on tags, cords, and cables shall also include the maximum operating temperature of the flexible cord or cable.
What is the NEC rule regarding conductor material?
Conductors must be insulated and made of copper, copper-clad aluminum, or aluminum unless otherwise specified in the NEC®. Any conductor installed in a raceway must be stranded if it is 8 AWG or larger. This is not required if it is permitted or required in another part of the NEC®.
What are the NEC rules for the identification of circuit conductors?
1) A continuous white outer finish along its entire length. 2) A continuous gray outer finish along its entire length. 3) Three continuous white stripes along its length. 4) White or gray tape or markings at the terminations.
What are 3 types of conductors?
There are four types of conductors, namely, good conductors, semiconductors, resistors and non-conductors.
What are the main requirements of good conductor material used for overhead lines?
Required Properties in Materials Used for Conductor in Transmission Line
- High conductivity.
- High tensile strength.
- Light weight.
- High resistance to corrosion in whether conditions.
- High thermal stability.
- Low coefficient of thermal expansion.
- Low cost.
What are the requirements for electrical connection?
Applying for Electric Service Connection
- Municipal Mayor’s Permit or Certificate of Final Electrical Inspection/Completion (yellow copy) or Permit for Temporary Service Connection (with control number and complete signatures)
- Electrical Plan duly signed and sealed by a Professional Electrical Engineer (PEE)
How do you identify a conductor and an insulator?
We can identify conductors and insulators using an electroscope by observing the gap between conduction band and valence band.
- If the gap is less its a conductor.
- If the gap is more its a insulator.
- You will learn about this in higher grades.
What 2 ways may an identified conductor be identified in flexible cords?
Conductor identification
It must be identified using one of the following methods [400.22]: White or gray colored braid. Colored tracer in the braid. White, gray, or light blue insulation.
What color should an identified conductor be?
The Code states: The grounded conductor of a branch circuit shall be identified by a continuous white or natural gray color. Also, The equipment grounding conductor of a branch circuit shall be identified by a continuous green color or a continuous green color with one or more yellow stripes unless it is bare.
Which regulation is concerned with the identification of protective conductors and which Colours are required to be used?
In addition, the protective conductors should be identified using green-and-yellow sleeving only (Regulation 514.4. 2).
Which NEC reference covers the means of identifying grounded conductors?
Article 402.8 Grounded Conductor Identification – Fixture wires that are intended to be used as grounded conductors must be identified by one or more continuous white stripes on other than green insulation.
Where an equipment grounding conductor is required it must be run with the?
Sections 300.3(B) and 250.134(B) generally require equipment grounding conductors to be run with the circuit conductors (see figure 7). The grounding and bonding requirements for systems and circuits over 600 volts are provided in Part X of Article 250.
Which of the following conditions must be met before conductors are permitted by the NEC to be run in parallel?
They must be the same circular mil area and have the same type of insulation. Finally, all parallel conductors must be terminated in the same manner.
Where is the conductor material not specified?
Conductors normally used to carry current shall be of copper unless otherwise provided in this Code. Where the conductor material is not specified, the material and the sizes given in this Code shall apply to copper conductors. Where other materials are used, the size shall be changed accordingly.
What article in the NEC covers conductors for general wiring?
Article 310 contains the general requirements for conductors, such as insulation markings, ampacity ratings, and conditions of use. It doesn’t apply to conductors that are part of flexible cords or fixture wires — nor does it apply to conductors that are integral parts of equipment [90.7 and 300.1(B)].
Do conductors have to be color coded?
Using color-coded cable assemblies helps the installer comply with 210.5(C)(1) because the conductors within are easily identifiable by color. However, color-coding the outside of a wiring method is not an NEC requirement.
Where in the NEC are requirements found for identifying grounded conductors?
The grounded conductor of a mineral-insulated, metal-sheathed cable (Type MI) shall be identified at the time of installation by distinctive marking at its terminations. Fixture wire shall comply with the requirements for grounded conductor identification as specified in 402.8.