Electrical Cable Insulation Types

Green insulated wires and bare copper wires are used for grounding wires.

Electrical cable insulation types.

Insulation on electrical wires is stamped with various codes and numbering that indicates the wire type and performance characteristics of the insulation. W rated for wet locations. Twice as thick in insulation but similar to po with silk or rayon top layer. Similarly nonmetallic nm cable which contains multiple wires has markings on the outer sheathing of the cable.

Submarine cable generally consists of a lead sheathed cable and is usually armored. The exterior insulation on cloth or fabric insulated nmc electrical wires are often black silver or white but may also be black or brown. Types of cables and wires communications cable. Composite insulators are less costly lighter in weight and have excellent hydrophobic capability.

Tape insulation such as impregnated paper or varnish paper rubber or rubber like synthetic compounds such as silicone rubber butyl rubber and oil based rubber. For example black and red wires typically are used for current carrying or hot connections and white wires usually are grounded neutral conductors. First of all cable insulation. N nylon coated to resist damage from oil or gasoline.

Rough service wire but not as nice looking as po. X synthetic polymer flame resistant. Two or more stranded wires with flexible insulation for temporary use. Usually a yellow green braided jacket green and yellow cord.

Hh high heat resistance up to 194 degrees fahrenheit. Understanding the basic markings helps you choose the right type of wire or cable for your project. Shielded or screened cable. Thermo plastics such as polyvinyl chloride pvc and crosslinked poly ethylene s xlpe.

The individual conductors within the cable may be insulated in rubber or fabric covered rubber or they may be insulated by plastic in later wiring products. Thermoset or thermoplastic dry use only. These are typically composed of a central rod made of fibre reinforced plastic and an outer weathershed made of silicone rubber or ethylene propylene diene monomer rubber epdm. H heat resistant.

Insulation material should be xlp or epr except when paper insulation is justified because of its high resistance to and freedom from internal discharge or corona. T thermoplastic insulation. Multiconductor construction should be used unless limited by physical factors. Portable or extension cord.