There are completely different causes for all sorts of wires and cables, together with copper. Generally wire insulation and typically it isn’t for particular causes. Engineers work onerous to supply wires for every utility on the market with the consent to deal with it.
Naked copper is often known as earthworm. It’s not remoted in any respect so it has no safety. It’s primarily utilized in houses as floor wires and has the very best conductivity with out isolation. So long as it doesn’t exit, electrical contractors don’t thoughts utilizing it.
Naked copper can be the bottom of most wires and cables. It comes strong or in smaller awg sizes wrapped to equal the identical scale. Through the use of the decreased prices, the wire provides extra flexibility to show across the nook. You would possibly suppose you’d all the time want flexibility as a result of it’d solely be higher, nevertheless it's not all the time the case. Generally electrical contractors have to be stiff in order that they will ship it far by the channel.
Inexperienced THHN wire is often known as floor wire when the wire must be exterior. Inexperienced requires the truth that THHN is a geyser and the explanation for the insulation is that it has safety from moisture. It may well then go exterior and on a channel whereas nonetheless functioning as a soil. The rationale for utilizing it indoors with out isolation is just because it’s cheaper. Generally you’ll be able to see these wires with yellow stripes too.
There may be not all the time a stray wire in every cable. When you want one, I like to recommend speaking to your seller's cable and ensure they understand it too. Most suppliers of wire additionally present the brass copper so you shouldn’t have an issue getting it for those who want it. You may often request a scripting membership to ensure you get the precise cable you’re in search of.
Supply by Chris G Bell