PVC Conduit & Duct Selection Guide
Conduit and duct both protect cable, but they are not the same product. Conduit is the smaller-bore raceway run through buildings and along routes to carry electrical wiring; duct is the larger, direct-burial pipe that houses power and telecom cables underground. 4B Factory manufactures uPVC duct to SAS 254/255 and PVC conduit to NEMA TC 2 in Al-Kharj. 4B Factory supplies both across Saudi Arabia.
Duct
Conduit or Duct — Which Do You Need?
The words are often used loosely, but the distinction is practical. Conduit is the raceway that protects and routes electrical wiring — typically smaller bore, run through buildings, along walls, or in shorter underground stretches. Duct is the larger pipe laid underground, usually in banks, to carry heavier power feeders and telecom cabling between points, and is built for direct burial.
On most projects you need both: conduit for the building and distribution wiring, duct for the underground power and telecom routes. Matching each to the right standard — NEMA TC 2 for conduit, SAS 254/255 for duct — is the core of specifying correctly.
Conduit & Duct by Application
Match the cable-protection job to the right product, standard and size. Confirm exact ratings against the product datasheet.
| Application | Product, Standard & Size |
|---|---|
| Building Electrical Wiring | PVC conduit · NEMA TC 2 · ½″–2″ |
| Distribution & Feeders | PVC conduit · NEMA TC 2 · 2″–6″ |
| Underground Power Duct | uPVC duct · SAS 254/255 · 20–63 mm · direct burial |
| Telecom & Fibre Ducting | uPVC duct · SAS 254/255 · direct burial |
| Duct Banks (Multi-Way) | uPVC duct · SAS 254/255 · laid in formation |
| Bends, Sweeps & Couplers | Fabricated / custom fittings · to conduit or duct spec |
Specifying Conduit & Duct Correctly
Right Standard
NEMA TC 2 for PVC conduit, SAS 254/255 for uPVC duct — see PVC conduit and uPVC duct.
Bore for Cable Fill
Size the bore to the cable count and diameter, allowing for pulling clearance and future capacity.
Burial & Loading
Underground duct must handle burial depth and traffic loading — direct-burial duct is built for it.
Environment
uPVC and PVC do not corrode, suiting Saudi saline ground and humid coastal conditions for buried runs.
Bends & Fittings
Runs need sweeps, bends and couplers — fabricated to spec, see customized fittings.
Standards & Approval
Confirm the standard and request the certificate of conformity — see the full product range.
Conduit & Duct by 4B Factory
PVC conduit and uPVC duct, manufactured in Al-Kharj to NEMA and Saudi Standards. Open any product for full specifications.
Specifying a Cable-Protection System?
Send your application, cable schedule, route and burial conditions and 4B Factory will recommend the right conduit or duct, standard and size, manufactured in Al-Kharj with standards documentation.
Frequently Asked Questions
Conduit is the smaller-bore raceway that protects and routes electrical wiring, often through buildings. Duct is the larger, direct-burial pipe that houses power and telecom cables underground. Most projects use both.
4B Factory manufactures PVC conduit to NEMA TC 2 (EPC 80-PVC) and uPVC duct to Saudi Standards SAS 254/255. Both are used for electrical and telecom cable protection across the Kingdom.
Size the bore to the number and diameter of cables, allowing clearance for pulling and future capacity. Conduit runs ½″–6″ and duct 20–63 mm; the exact size depends on the cable schedule.
Yes. uPVC duct to SAS 254/255 is designed for direct burial, carrying underground power and telecom cabling. It does not corrode, which suits Saudi ground conditions.
Yes. 4B Factory supplies uPVC duct to SAS 254/255 for power, telecom and fibre cable protection, including duct-bank formations, factory-direct from Al-Kharj with standards documentation.
Request Conduit & Duct for Your Project
Send your application, sizes, standard and quantities for a factory-direct quotation with standards documentation. Call, WhatsApp, or email info@4bfactory.com.