Thhn In Attic

The cable is insulated with a thermoset plastic jacket pvc that is flame retardant sunlight resistant lead free strong and stable.

Thhn in attic. This thinner insulation can often lead to a current leakage and even a breakdown during chemical or environmental exposure. 25 amperes x 82 19 amperes. Thhn thwn wires are individual insulated and color coded wires. With a flashlight examine the attic and locate the path that you will use to run the wire between the two locations.

In the basement it is the bottom of the wall and is known as floor. The pvc insulation in thhn also creates a toxic smoke when burned therefore making it undesireable in certain applications. Climb through the attic access using a ladder if necessary and look into the attic space. Drill a 1 5 inch starter hole on an angle of the the electric box.

Thhn thwn 2 conductors are constructed of annealed soft copper that follows astm b3 and astm b8 standards. They are similar to the wires you see when you strip the outer sheathing off of nm cable. Grounding with conduit. Thhn uses a thinner pvc insulation which is a key factor in terms of its electrical properties.

Cut a hole for the electrical box. Type thhn thwn 2 building wire is intended for general purpose applications as defined by the national electrical code nec. Type thhn thwn 2 is permitted for new construction or rewiring for 600 volt applications. Multiply the conductor s ampacity by the derating percentage.

Applications requiring type thhn or thwn 2 the conductor is appropriate for use in wet or dry locations at temperatures not to. When there is no flooring to walk on other than the edges of the trusses consider. The 12 gauge wire tw wire in the 52 c attic is derated to 76 percent of its maximum ampacity. In the attic the beam is the top of the wall and is called the roof.

Familiarize yourself with the footing situation.