Southwire 639SI Steel Insulated Conduit Body 3.5 in

Product Description

The SOUTHWIRE 639SI is a steel insulated conduit body designed for use in electrical raceway systems. Conduit bodies of this type provide access points for wire pulling, splicing, and direction changes within a conduit run. The 639SI is constructed from steel with an insulated interior, making it suitable for installations where conductor protection from sharp edges and abrasion is required. At 15 pounds, this is a robust fitting intended for heavy-duty commercial or industrial conduit work. Licensed electricians and electrical contractors are the primary installers of this fitting.

This conduit body is sized for 3.5-inch conduit trade size, placing it in the range of large-diameter raceway applications typical of industrial facilities, commercial buildings, and utility service entrances. The insulated steel construction suits environments where mechanical protection and conductor integrity are both priorities. It is appropriate for use in exposed or concealed conduit systems where access to the raceway interior is needed without breaking the conduit run entirely.

Key Features

• Steel construction provides mechanical strength and durability in demanding install environments
• Insulated interior protects conductors from abrasion at the conduit body entry and exit points
• 3.5-inch trade size accommodates large-diameter conduit runs
• Designed for access, wire pulling, and direction changes within a raceway system

Compatibility

Designed as an OEM-style replacement or standard fitting for 3.5-inch trade size steel conduit raceway systems in commercial and industrial electrical installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all circuits in the raceway before opening or working on the conduit body. Ensure all conduit connections are properly secured and that the insulated interior is free of damage before pulling conductors. Conduit bodies of this size typically require conduit wrenches and appropriate supports per NEC fill and support spacing requirements.

Technical Specifications

• Trade Size: 3.5 inches
• Material: Steel with insulated interior
• Weight: 15 pounds
• UPC: 75133823180

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 639SI