Raceway Connectors, Couplings and Fitting Markings
Identify conduit connectors, couplings and transition fittings, then check the exact product for raceway type, environmental markings and assembly conditions.
Last updated:
Identify the connection task
A coupling joins raceway sections; a connector terminates a raceway at an enclosure or other specified interface. A transition fitting joins identified different systems. Appearance and trade size help narrow the search but do not establish that the product is suitable for the intended assembly.
| Fitting | Typical interface | Product information to verify |
|---|---|---|
| Coupling | Raceway to raceway. | Permitted raceway types, sizes and joining method. |
| Connector | Raceway to box or enclosure entry. | Raceway compatibility, entry size, thread/locknut and any sealing components. |
| Transition / combination fitting | One identified raceway system to another. | Both permitted interfaces; no implied approval for any physically fitting tube. |
| Liquidtight fitting | A specified flexible conduit to an entry. | Exact conduit family, seal components and environmental limitations. |
| Expansion / deflection fitting | A documented movement condition. | Movement range, bonding provisions and installation instructions. |
Read markings and assembly conditions
Set-screw and compression describe joining methods, not universal environmental ratings. Check the exact catalog number and listing information for dry, wet, concrete-tight or raintight use as applicable. Required sealing rings, gaskets, locknuts or assembly details are part of the specified product arrangement.
Do not identify an EMT fitting as a cord grip, or assume a conduit connector maintains an enclosure rating with any gasket. Bonding performance also belongs to the complete permitted assembly.
Keep a fitting identification record
- Identify each raceway material, family and trade size at the interface.
- Record the fitting manufacturer, complete catalog number and visible markings.
- Compare the required location conditions with the exact product documentation.
- Retain the installation sheet and enclosure entry details for the review.
Use conduit dimensions for size context, knockout sizes for entry identification, and enclosure ratings for their separate protection classifications. A dimension match alone is insufficient.