answersLogoWhite

0


Best Answer

A 120 volt 3 wire electrical cable has an added ground, the 2 wire does not. In higher voltage applications, like a clothes washer/ dryer for example, it has 3 phase wiring.

User Avatar

Wiki User

βˆ™ 11y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why do some cables have three wires and some have two?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

How many wires connected to the CD rom?

Usually two cables total. Such as the SATA Cable and the power cable. As for how many wires are in those cables, it would depends on the connection. Such as IDE have 40 wires. Power cables are usually four pin. It all depends.


How can you tell the difference between a floppy ribbon and an IDE ribbon?

Floppy Ribbon : The floppy cable has 34 wires. There are normally five connectors on the floppy interface cable, although sometimes there are only three. These are grouped into three "sets"; a single connector plus two pairs of two each (for a standard, five-connector cable) or three single connectors. IDE Ribbon : IDE cables consist of either 40 individual wires or 80 individual wires. Ultra ATA/66 or later devices need the 80 wire cables to operate efficiently. Most of these wires are used to transfer data between the motherboard and the drives.


How many electric wires can be pulled through a 1 inch hole if you are using 12-2wire 12-3 wire or 14-2 wire?

Assuming typical insulation thickness, you could pull about three 12-2 wires or two 12-3 wires through a 1-inch hole. For 14-2 wires, you could potentially pull around four wires through the same hole. It's always recommended to consult local electrical codes and guidelines for specific requirements.


How many wires are there in a USB cable?

a usb cable has four wires, two for power and two for communication.


What is the difference in armoured and unarmoured cables?

Cables are two or more wires running side by side and bonded and there is armored and unarmored cable. Armored cables are protected by flexible steel covering while the unarmored cable is only covered by plastic.


Where is the starter on a f 250 diesel?

Disconnect the ground cables from (both) batteries. Slide under the passengers side, behind the front tire and remove two wires and three bolts from starter. I believe the bolts are 17mm.


Twisted pair cables?

A type of cable that consists of two independently insulated wires twisted around one another. The use of two wires twisted together helps to reduce crosstalk and electromagnetic induction. While twisted-pair cable is used by older telephone networks and is the least expensive type of local-area network (LAN) cable, most networks contain some twisted-pair cabling at some point along the network. Other types of cables used for LANs include coaxial cables and fiber opticcables.


Why on my Dodge Neon are there three cables to the battery and how do they connect?

i assume the two red cables are for the positive and the black one single for the negative


How many wires come in from the weather head?

If single phase - 2 wire service > two wires If single phase - 3 wire service > three wires If three phase - 3 wire service > three wires If three phase - 4 wire service > four wires US residential service is usually single phase 3 wire service: Two hots and neutral.


To reverse the rotation of a three phase motor you would?

Switch two of the three wires.


What network uses radio waves instead of wires or cables?

WiFi, WiMax, and the two cell phone networks: GSM and CDMA


How can you determine if a electric motor is 1 phase or 3 phase if there is no name plate?

Check the motor's terminal box. If there are three service input cables - such as red, yellow and blue - plus an earth wire, then it is a three phase motor. If there are only two wires plus an earth wire, then it is single phase.