Overview
The Appleton RB150-100 steel reducing bushing is a precision-engineered conduit adapter designed to safely reduce 1-1/2″ threaded rigid or IMC conduit to 1″ for reliable electrical installations. RB Series reducers are explosionproof and dust-ignitionproof, meeting rigorous hazardous location standards. Each bushing features smooth rounded integral design to protect conductor insulation and maintains full machine tapered NPT threads for secure, leak-free connections.
Key Features
- Explosionproof and dust-ignitionproof design — rated for Class I, II, and III hazardous locations (Divisions 1 & 2; Groups A–G)
- Zinc-electroplated steel construction — corrosion-resistant with long service life
- NPT threaded connection — male 1-1/2″ entry, female 1″ exit
- Smooth rounded bushing — integral design protects wire and cable insulation
- Compatible with rigid conduit and IMC — versatile for multiple conduit types
- Compact 15/16″ overall length — minimal space footprint for tight installations
Technical Specifications
- Large End Trade Size: 1-1/2″
- Small End Trade Size: 1″
- Material: Steel, zinc electroplated
- Thread Type: NPT (National Pipe Thread)
- Connection: Male 1-1/2″ MNPT × Female 1″ FNPT
- Overall Length: 15/16″
- Weight (per unit): 0.31 lb
- Finish: Zinc electroplate
- Hazardous Location Rating: Class I (Groups A, B, C, D), Class II (Groups E, F, G), Class III
- Approvals: UL 886, CSA C22.2 No. 25, CSA C22.2 No. 30
- Quantity per Box: 25 units
Typical Applications
The RB150-100 reducing bushing is standard in hazardous location installations including:
- Oil and gas production facilities and refineries
- Chemical processing and manufacturing plants
- Mining operations and underground installations
- Grain handling facilities and agricultural processing
- Electronics manufacturing and assembly environments
- General industrial electrical distribution where stepping down conduit size is required
Compatibility & Replacements
Compatible With
- Rigid metal conduit (RMC)
- Intermediate metal conduit (IMC)
- NPT threaded conduit systems
- Class I, II, and III hazardous location enclosures
- Appleton explosionproof and dust-ignitionproof fittings and connectors
- Standard 1-1/2″ to 1″ step-down conduit installations
Replaces / Drop-In Replacement For
The RB150-100 is the standard reducing bushing for 1-1/2″ to 1″ NPT conduit reduction. It maintains interchangeability across the Appleton RB Series product line. Verify compatibility with your system integrator before ordering to ensure identical thread pitch and connection type.
Works With
- NPT-threaded rigid metal conduit (RMC)
- NPT-threaded intermediate metal conduit (IMC)
- Appleton conduit couplings, elbows, and sealing fittings
- Standard electrical conduit hangers and supports
- Hazardous location-rated enclosures and junction boxes
