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How to Match Conduit Fittings: Couplings, Connectors, Boxes and Clips for KBG and JDG
Created on 11.05
How to Match Conduit Fittings: Couplings, Connectors, Boxes and Clips for KBG and JDG
Conduit fittings must match the conduit they join, and the most common mistake is assuming that a "16" or "20" fitting fits any "16" or "20" tube. KBG and JDG conduit are joined in different ways, and the fitting, the box, and the clip all have to suit the tube's type, outer diameter, wall thickness, and the thread or fixing method. Checking six points before you order avoids returns and delays on site. This guide shows what each fitting does, what it must match, and what to send your supplier.
Why Fittings Are Easy to Get Wrong
- Same size name, different parts.
- Two joining systems.
- Several makers, several tolerances.
- Boxes and clips are sized too.
What Each Fitting Does and What It Must Match
Fitting | Job | Must match |
Straight coupling (including quick coupling) | Joins two lengths of conduit end to end | Conduit type (KBG or JDG), outer diameter, and wall thickness |
Male thread connector | Ends the conduit and screws into a box or device with an internal thread | Conduit type and size, and the thread type and size of the box or device |
Female thread connector | Ends the conduit and screws onto an externally threaded part | Conduit type and size, and the thread type and size of the mating part |
Drawn box and octagonal box | Junction, pull, or fixing point for the conduit run | Number and size of knock-outs, depth, and the connectors you will fit |
Bushing | Protects the cable at the conduit end from sharp edges | Conduit size, and the thread or fitting style |
Clip or nail clip | Holds conduit to the wall or ceiling | Conduit outer diameter, the fixing surface, and the environment |
Ground clamp | Connects an earth conductor to the conduit | Conduit outer diameter, and the earth conductor size |
Flexible conduit connector | Joins rigid conduit to flexible metal conduit | Flexible conduit size, thread, and the rigid side's fitting style |
Six Checks Before You Order
- Conduit type.
- Outer diameter and wall thickness.
- Joining method.
- Thread type and size.
- Box knock-outs and depth.
- Finish.
A Typical Branch Circuit: What Parts You Need
Point in the run | Parts |
At the distribution board | Conduit end fitting or connector, bushing, and ground clamp if required |
Along the route | Straight couplings, clips at set intervals, and bends |
At a junction or switch point | Box (drawn or octagonal), connectors, and bushings |
At a light or device | Connector and box, or a flexible conduit connector |
The number of each part depends on the layout, so count it from your drawings. Clip spacing follows the code or specification for your project.
What to Send Your Supplier
- The conduit type, outer diameter, wall thickness, and finish you are using
- The joining style you need: snap-press, set-screw, or threaded
- The thread type and size at boxes and devices
- Box type, size, and number of knock-outs
- The environment: dry indoor, damp, or outdoor
- Quantities, or a layout drawing so the parts can be counted
- A sample of the conduit, if you can, so the fit can be checked
Common Mistakes
- Mixing KBG and JDG fittings.
- Ignoring wall thickness.
- Thread mismatch.
- Using small boxes.
- Plain fittings outdoors.
- Skipping the ground clamp.
Conclusion
Conduit fittings work as a set, so choose them together with the conduit. Fix the conduit type, size, wall, and finish first, then match the joint style, threads, boxes, and clips to that. Send your supplier the full list and a layout drawing where you have one, and test a sample set before a large order. Final selection should follow your project specification and the applicable standards.
FAQ
Can I use JDG fittings on KBG conduit?
Not as a rule. KBG uses snap-press fittings and JDG uses set-screw fittings, so the joint is built differently. Use fittings made for the conduit type you have, and confirm with your supplier.
What do I need to tell my supplier to get the right fittings?
Give the conduit type, outer diameter, wall thickness, joining method, thread type and size at boxes, finish, and quantities. A layout drawing or a sample of the conduit makes it easier to get a correct fit.
Do fittings need the same finish as the conduit?
They should suit the same environment. A hot-dip galvanized conduit joined with thin plated fittings in a damp or outdoor route can rust at the fitting first, so keep the finish consistent.
Looking for conduit and matching fittings? Browse our GI conduit range and our guide Electrical Conduit Types Explained, or email abby@wananelectric.com with your conduit type, size, and quantities, and our team will quote conduit, fittings, and boxes together.
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