Difference between THHN THWN SEOOW PLTC VNTC

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Old 05-12-16, 10:20 PM
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Difference between THHN THWN SEOOW PLTC VNTC

I started a new job at an electrical supply company. I have plenty of warehouse experience but not any with electrical supplies. I recently got a promotion to be the wire cutter. Along with this, I have a huge project to get the inventory straight. ( it's a mess) now I am good at inventory just from exp. But I need to organize this by type of wire, awg, quantity etc. I need to get more familiar with the product. Does anyone know of good introduction to wire websites or if anyone could explain the types to me mentioned in the title. All help is good help. Thanks
 
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Old 05-12-16, 11:49 PM
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Welcome to the forums.

THHN= thermoplastic-high-heat-nylon. Thermoplastic wire with high heat capability- nylon jacket. Individual NM-B conductors are THHN. Makes for thinner insulation but not water resistant.

THWN= thermoplastic-heat-water-nylon. Thermoplastic wire with heat and water resistant capability and nylon jacket. Similar to THHN but is waterproof for use in outside work.... especially in underground conduit.

Many companies offer a combined THHN/THWN rating on one product. Eliminating the need to carry both separately.


SEOOW= is just one of MANY flexible service type cables. It's 600v while SJOOW is 300v.

This chart can be helpful
S = Service cord
J = Junior service cord
O = Oil-resistant outside jacket
OO = Oil-resistant both inside insulation and outside jacket
W = Weather and water resistance
T = Thermoplastic - a hard shiny plastic looking cable. Brittle in cold weather.
E = Elastomer - a rubbery type cable. Great for cold weather.

PLTC= power limited tray cable. Wire or cable rated for 300v or less and used for installation in an open cable tray.

VNTC= vinyl-nylon-tray cable. Usually higher heat and chemical resistive coatings.

Tray Cable FAQs from Allied Wire and Cable - Manufacturer and Distributor of Custom Tray Cable

Many of these wires/cable look the same. You can't always tell what they are by just looking at them.
 
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