Question 1

What is copper clad aluminum? Is it copper or aluminum??

Accepted Answer

Most of the answers already posted to this question, have clearly pointed out that important differences between copper clad aluminum (CCA) and pure copper conductors. Especially the highly detailed answer by “The Undisclosed”.

These jumper cables are designed for designed for automotive applications. However, there’s another point to consider when comparing the benefits of 100% copper over aluminum and all other variations.

The electrical wiring used in the construction of the houses we live in is the most important from a safety standpoint and is also another good example of the difference in electrical conductors. The cost of producing copper reached an outrageously high amount during the seventies. It suddenly became one of the most expensive materials used in the construction of new residential and commercial building projects. Aluminum wiring became an inexpensive alternative to the much higher priced copper wiring and was used extensively in new construction. Everything seemed fine UNTIL relatively new homes started burning down. The cause of these fires was quickly linked to the all aluminum wiring being used.

The reason why has already been explained in the other answers but in a nutshell, the aluminum wiring is such a poor conductor of electrical current that anywhere the aluminum conductors were cut and spliced or connected to a switch or outlet, extra measures had to be taken to ensure the connection point was tightly secured. If the electrical bonding point was loose then it would become a point of high electrical resistance resulting in a dangerous  increase in temperature at that point. High enough to cause combustion with any flammable materials in the immediate vicinity.

The problem was quickly dealt with by the construction industry banning the use of all aluminum wiring. Copper clad aluminum or CCA became an acceptable compromise for wiring in most types of new construction. It’s the process of coating aluminum conductors with a thin layer of copper to improve its ability to conduct electricity. It costs considerably less than pure copper and with projects that require hundreds or even thousands of feet of wiring, it can substantially reduce the overall cost. But knowing the technical differences between the two, I prefer 100% copper regardless of the price.

Question 2

Are they made in USA​?

Accepted Answer

Box says "made in China". Works great on my '62 Caddy my '09 VW Tiguan and my '99 Camry. I figured they must be good for American, German and Japanese cars.

Question 3

How long is the lead that connects to the battery permanently to the connection plug outside the vehicle?

Accepted Answer

It is five feet going from the battery to the quick connect/disconnect coupler.

Question 4

What is the length of the quick connect cable?

Accepted Answer

The cable that affixes to your car's battery is 5 ft. and the jumper cable is 25 ft.

ASIN	B01GSLWX7C
Best Sellers Rank	46,673 in Automotive ( See Top 100 in Automotive ) 121 in Car Battery Jump Leads 52,463 in Mobile Phone Accessories
Brand	Energizer
Customer Reviews	4.7 4.7 out of 5 stars (36,317)
Date First Available	23 Jun. 2016
Exterior	Thick Vinyl Coating
Item Weight	3.4 kg
Item model number	ENB220
Manufacturer	Energizer
Manufacturer part number	ENB220
Model	ENB-220
Package Dimensions	39.09 x 31.19 x 10.39 cm; 3.4 kg
Special Features	All Weather Use, Flexible, Heavy Duty, Tangle Free

2 Gauge - 20 FT Energizer Jumper Cables

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