WesBell Electronics

Difference Between TFFN and THHN Electrical Wire

THHN Electrical WireElectrical wires are needed for the electricity to pass through and power up your home and office equipment. Electrical wires are comprised of conductive materials such as copper and aluminum. Copper conductors are most commonly used in electrical devices because they are very practical to use. They have high conductivity, tensile strength, ductile, high thermal conductivity, high creep resistance, electrical overload resistance and corrosion resistance. On the other hand, aluminum conductors have more resistance and weighs lesser than copper conductors. Aluminum conductors are most often used for bulk distribution of power and large feed circuits. Thermoplastic insulation is used to cover these conductors for protection from corrosion, water and other chemicals that may cause exposure or electrical shorts.

The thickness and size of an electrical wire varies depending on the amount of electricity that flows through it. The sizes of wires are measured using inches or diameters. Specific amount of circuitry, resistance and conductivity is required for an electrical wire to work. The amount of current that travels through the wire is decreased by the amount of resistance encountered by the electricity. Thicker wires hold more current since the electricity flowing through it encounters less resistance.

The most commonly used wires for household and office equipment is the TFFN and THHN Wires. These are built in accordance with the National Electric Code which is set to protect you and your household. The wiring systems specified are to be followed by every household which are analyzed using some factors: the intended use, amount of power needed by the wiring system’s circuit, the size and type of the building where the implementation of the wiring system will take place and the environment that the wiring system will undergo.

THHN vs. TFFN wires have very little differences. These letters signify the approvals that the wires went through. THHN is short for Thermoplastic High Heat Resistant Nylon while TFFN is short for Thermoplastic Flexible Fixture Wire Nylon. Both wires can be used for appliance and machine tools that is not higher than 600 volts.

To differentiate THHN vs. TFFN let us take a look at each wire's descriptions.

TFFN wire vs. THHN Wire
Conductor: soft drawn bare Copper Conductor: soft drawn bare copper
Insulation: PVC with Nylon jacket Insulation: PVC with Nylon jacket

TFFN has lower heat resistance compared to THHN it is not ideal for wet locations. Both THHN and TFFN wires are used as general purpose wiring, for appliances, machine tools and control circuit wiring. Although only TFFN 18 1 can be used as a dog fence wire. THHN is not ideal to be directly buried underground. TFFN is used on 16 and 18 AWG size only. It's not available in bigger sizes and is dual rated THHN/THWN. THHN vs. TFFN works the same way with only little differences. They both fall under the electrical wire category also known as building wire because contractors mostly use them for buildings and homes.

Your wiring system should be handled with care and expertise to maximize its benefits and avoid any possible harm.

Please call with any questions you might have.