This document discusses home electrical wiring standards and color codes. It explains that:
- Black wires are used for power in all circuits and should be considered "hot".
- White and gray wires indicate the neutral wire which connects to the neutral bus bar.
- Green wires indicate the grounding of a circuit and connect the grounding terminal to the ground bus bar for safety.
- Other common wires are red (secondary live wire), blue and yellow (also carry power but not for outlets), and bare copper (grounding wire).
The document provides details on the standard color codes for electrical wires and their purposes in home wiring circuits. It emphasizes the importance of knowing these codes for both correct wiring
This document discusses home electrical wiring standards and color codes. It explains that:
- Black wires are used for power in all circuits and should be considered "hot".
- White and gray wires indicate the neutral wire which connects to the neutral bus bar.
- Green wires indicate the grounding of a circuit and connect the grounding terminal to the ground bus bar for safety.
- Other common wires are red (secondary live wire), blue and yellow (also carry power but not for outlets), and bare copper (grounding wire).
The document provides details on the standard color codes for electrical wires and their purposes in home wiring circuits. It emphasizes the importance of knowing these codes for both correct wiring
This document discusses home electrical wiring standards and color codes. It explains that:
- Black wires are used for power in all circuits and should be considered "hot".
- White and gray wires indicate the neutral wire which connects to the neutral bus bar.
- Green wires indicate the grounding of a circuit and connect the grounding terminal to the ground bus bar for safety.
- Other common wires are red (secondary live wire), blue and yellow (also carry power but not for outlets), and bare copper (grounding wire).
The document provides details on the standard color codes for electrical wires and their purposes in home wiring circuits. It emphasizes the importance of knowing these codes for both correct wiring
This document discusses home electrical wiring standards and color codes. It explains that:
- Black wires are used for power in all circuits and should be considered "hot".
- White and gray wires indicate the neutral wire which connects to the neutral bus bar.
- Green wires indicate the grounding of a circuit and connect the grounding terminal to the ground bus bar for safety.
- Other common wires are red (secondary live wire), blue and yellow (also carry power but not for outlets), and bare copper (grounding wire).
The document provides details on the standard color codes for electrical wires and their purposes in home wiring circuits. It emphasizes the importance of knowing these codes for both correct wiring
Download as DOCX, PDF, TXT or read online from Scribd
Download as docx, pdf, or txt
You are on page 1/ 7
P= VI cos
P= 240 (I) 0.85
I=
P 240 x 0.85
Calculate for DB circuit breaker
Simplified Amp Calculation For single phase = kw x 5 = Amp required For three phase= kw x 1.64 = Amp required Market existing circuit breaker = 6,10,20,30,45,63 Amp Cabling Single core cable consists of 5 cable Red , yellow, blue, black, green. Double core cable- consist 2 single core
MCB main circuit breaker: to protect the cable.
MCB means Miniature Circuit Breaker -- it is used for upto 100Amps in the motor feeders. MCCB menas Moulded case Circuit Breaker -- it is used for 25oAmps to 800Amps in the motor feeders. ELCB means Earth Leakage Circuit Breaker -- it is used to trip the Circuit breaker if any leakage fault occured means. RCCB means Residual Current Circuit Breaker -- A residual current device (RCD), or residual current circuit breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the phase ("hot") conductor and the neutral conductor. Such an imbalance is sometimes caused by current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit.
All home electrical wires made in the U.S. follow standard color codes that identify each wire's function in a circuit. Knowing the electrical color code that dictates which wire does what is imperative not only in the correct configuration of an electrical system, but it's also paramount for your safety. Be aware that all electrical wires, regardless of their function, could carry an electrical current at some point, so treat all wires with equal caution. Also, highly rated electricians note that older homes, built prior to the 1940s, might use different color codes if the wiring has never been upgraded. Check out this detailed illustration that explains each wire's color and purpose:
Common color codes used in electrical wiring. (Illustration by Brandon Smith)
Black Black electrical wire is used for power in all circuits. Any circuit's black wire should be considered hot or live. Black wire is never used for a ground or neutral wire and should be used as the power feed for a switch or an outlet. A black wire is often used in a circuit as a switch leg, the connection that runs from the switch to the electrical load. RELATED: Signs of Home Electrical Problems
Red Red electrical wire indicates the secondary live wires in a 220-volt circuit, used in some types of switch legs and in the interconnection between smoke detectors that are hard-wired into the power system. You can connect a red wire to another red wire or to a black wire.
How to replace an electrical outlet
Blue and yellow Yellow and blue electrical wires are also used to carry power but are not for wiring the outlets for common plug-in electrical devices. These colors are used for the live wire pulled through conduit. You'll use yellow mainly as switch legs to fans, structural lights and switched outlets. You'll use blue mainly as a traveler for a three-way or four-way switch. MORE: How Much Does It Cost to Rewire a House?
White and gray
White and gray indicate a neutral wire. White is the color most often used for this function. A neutral wire connects to the neutral bus bar within an electric panel. (A bus bar is made of conductive metal that attracts the electric current for distribution outward to feeders.) You can connect white and gray only to other white and gray wires. Although neutral, they can still carry current, particularly the unbalanced load the electricity not being used and being returned to the electrical service.
Green Green indicates the grounding of an electric circuit. A green wire can connect only to another green wire and should never connect to any other color wire. Green wires connect to the grounding terminal in an outlet box and run from the outlet box to the ground bus bar within an electric panel. The purpose of the green wire is to provide a path to ground for a circuit's electric current if a live wire within the circuit happens to touch metal or some other conductive material. In the event of a fault, it could carry significant current, so treat green wires cautiously.
If you're apprehensive about dealing with electrical wires in your home, search Angies List for top-rated electricians in your area. Have you faced a wiring problem in your home? Share your thoughts and concerns in the comments section! Editor's note: This is an updated version of an article originally published on Aug. 25, 2011. June 15, 2015 By Angie's List Staf
Comments Confusing wiring colors Tony | Nov 14,2015 5:38PM
I'm installing a Home Depot ceiling fan. I'm confused because I only have 3 colored of wire. Grey, white, and bare copper. The issue is the grey and white are connected to get her with wire nuts and the grounds are all tigether. My new fan has a white wire , black wire and a green wire. I know the green goes with the bare copper, but how do I pick which grey and white pair from the ceiling do I connect the to the fans black wire or white wire to which grey and white?
reply
Oven steve | Nov 7,2015 5:15PM
I am replacing an old oven,. The new oven has Red, Green, Black. The source has Red, Green, Black, and White. Do I cap the white and connect the others color to color? I tried this and it seemed to work but I am hesitant to close it all up until I am sure it is right.
reply
Toy Wires Sami | Nov 3,2015 9:39AM
I'm doing a school project, and I need to know what colors wires mean in toys. Need it within 6 days!
reply
4-H DPA Project
Girly Girl | Oct 28,2015 8:31PM
Hi. I am on fifth grade and I am doin DPA for 4-H. I did electricle wiring and I need simple definitions for the black wire, white wire, and bare wire.
reply
Thermostat wire Dale | Oct 11,2015 10:30AM
I have a thermostat that has letters for from top to bottom R W Y I have only 2 wires coming from the wall, a red and yellow, there is also a green stuck into the wall not utilized when I hook the r to r and y to y the furnace continues to run any ideas?
reply
I'm guessing these are
Bryan | Oct 28,2015 1:22PM
I'm guessing these are probably low voltage thermostat wires that come from the heater, and not from a power source. You need two wires to complete a circuit voltage and a return path. The red and yellow wires provide the circuit loop that is needed to provide low voltage power for the thermostat to operate. reply
porch and garage lights
Keane Oshita | Oct 10,2015 6:55PM
I'm replacing the porch and garage lights. The wires coming out of the house are red, white and yellow. The wires on the fixture are white, black and bare copper. I know the copper is the ground. How do the others connect? I assume it has something to do with a three way switch? Is one of the wires coming out of the house a ground?
reply
Wiring Jackie sanders | Oct 23,2015 2:58PM
Red to black White to white Green to copper reply
Extension cord colors
Ron | Oct 4,2015 9:14AM
I read everything above with great interest. However, my situation seems different. I am putting a new female and on an extension cord, and it has white black and grey insulation on the three inter wires. Black should be hot, but both gray and white are neutral? Which is ground?
reply
Extension cord colors
Mordecai | Oct 12,2015 9:11PM
What you are describing is totally well, largely nonstandard. Use the black wire for hot (brass screw), white wire for neutral (silver screw), and the gray wire for ground (green screw). I'm assuming here that the gray wire is supposed to be green, and since all three colors are to be hidden from the user the manufacturer felt free to use whatever they had in stock. Ground is supposed to be either a green-coated wire or an uncoated wire. If you have a continuity tester, use it to make sure that what's hot, neutral, and ground on the male end is still hot, neutral, and ground on the female end.
