Nesco

Accueil » Nesco

Free Shipping!

Enjoy Free Shipping in Ontario and Quebec. All other Canadian provinces receive 10% Off their order. Terms and conditions apply.

Shop now

Trusted Electrical Supplies for Pros, Facilities and Homeowners Across Canada

Shop top brands, Canadian-made products, and expert-approved tools — all with fast, reliable delivery.

Shop Our Catalogue shop Made in canada

1 Produit

Buying for a project or in volume?

Contractors and bulk buyers can get project pricing. Send your material list and we will quote it back, priced in CAD, shipped Canada-wide or ready at our Vaughan counter.

Apply for Contractor Pricing → Request a Project Quote →
About this category

Nesco supplies electrical fittings and rough-in hardware, and Maple Electric Supply sells Nesco in Canada. The single listing here is a jobsite staple: the KO50 steel knockout closure in 1/2-inch size, packed 100 to a box at $19.

  • KO50 1/2-inch steel knockout closures, 100 per pack, at $19

Knockout seals are inspection-day parts, cheap until you run out on site. A few boxes tucked into a larger order ride free to Ontario and Quebec addresses over $150, while the rest of Canada gets 10% off at checkout. Pickup at the Vaughan, ON counter suits anyone already driving past, standard delivery is 3 to 7 business days anywhere in Canada, and the price match guarantee covers even a $19 box of closures.

Nesco makes knockout closures, the steel plugs used to seal unused knockout holes in panels, boxes and enclosures. The KO50 listed here is a 1/2-inch steel closure sold in packs of 100 for about $19. Sealing unused openings is a code requirement, not a finishing preference: an open knockout leaves live parts accessible and defeats the enclosure rating. Steel closures suit steel enclosures and hold better than plastic under vibration or heat. Buying by the 100-pack is the sensible approach for anyone doing panel work regularly, since these are consumed a few at a time on every job.
Common questions
Why do unused knockouts have to be filled?
An open knockout leaves energised parts accessible and defeats the enclosure's protection rating. The Canadian Electrical Code requires unused openings to be effectively closed. It is one of the most common items written up on an inspection.
What size closure do I need?
Match the trade size of the knockout, not the measured hole. The KO50 is for 1/2-inch knockouts. Standard trade sizes step 1/2, 3/4, 1, 1-1/4 inch and up, and each needs its matching closure.
Steel or plastic closures?
Steel is preferred for steel enclosures and holds up better under vibration and heat. Plastic closures are lighter duty. Where the enclosure has a specific environmental rating, use a closure listed to maintain it.
How are these packaged?
The KO50 comes in packs of 100. That is the practical quantity for a contractor, since a few get used on every panel and box installation and they are easy to run short of on site.
Do you carry other sizes and other Nesco items?
Ask us. Call (905) 553-7171 or email sales@mapleelectricsupply.ca with the size and quantity and we will confirm what we can supply and at what price.

Maple Electric Supply offre une gamme complète de produits électriques, incluant luminaires, câbles, panneaux, outils et pièces d'automatisation industrielle. Magasinez en ligne et profitez de marques fiables et d'une livraison rapide partout au Canada. Nous sommes fiers de servir les électriciens, les constructeurs et les propriétaires.