In usa domestic voltage is 110 volt whereas in britain and asia we use 220 volt. I was asked that whether can we use american cable for 220 volts supply. I know the current carrying capacity is based on the cross sectional area of the conductor and insulation thickness. In usa AWG is used whereas in britain,asia etc we specify the cable according to cross sectional area. My question is whether the insulation thickness for 110 V and 220 V cable will be same for same cross sectional area. Can somebody provide specifications for 110 v cable.

Cross sectional area of the wire has no bearing. Most portable cable in the US is either 300 V or 600 V. Unfortunately even the manufactures fail to mention rms, DC or p-p in their notation.

It seems to be an rms value when I questioned a manufacturer once.

Insulation is material and thickness dependent. Ratings also have a safety factor built in. Teflon, for instance is 1000v per 0.001"

Typical building wire used in the US is NM-B. Generic specs here: Tractor Supply Company - Romex 12-2 CU NM-B Wire Gauge 25 ft (http://www.tractorsupply.com/webapp/wcs/stores/servlet/ProductDisplay_10551_10001_28682_______?rFlag=true&cFlag=1)

Thank You for the reply

I edited my response to say "cross sectional area of the wire has no bearing"

In addition if we talk of volatage rating of a cable it refers the insulation.. but if we talk about the cross sectional area it refers to its ampacity..

The cable of 220v is large in diameter and cable of 110 volt is small in diameter then 220v cable.

Usually low voltage cables are rated up to 1000v.. so there is no question whether you use it in 110v or 220v

danar:
Try again. 300 and 600 Volt cables are very common. SHow me a 1000 V cable.

As per your NEC




As per NEC tabel on Allowable Ampacities of single insulated conductor from size 2.0mmsq up to 500mmsq these conductors are rated FRom 0 to 2000V.. please refer to your NEC tables...

Based on the original post, I assumed that the reference was for portable cable rather than building wire. Who knows, we both could be wrong.