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The B-LINE 79903832843 is a runway dropout fitting designed for use with cable tray systems sized at 3/8 inch by 1.5 inch. Runway dropouts serve as transition hardware that allows cables to exit a cable tray runway and route downward or outward to equipment, panels, or junction points. This fitting is a structural accessory component installed by electricians and low-voltage contractors as part of a complete cable management system. It is sold individually and is designed to maintain a clean, code-compliant cable exit path from the tray runway.
Runway dropouts like the 79903832843 are used in commercial and industrial electrical installations where structured cable tray systems organize power, data, or control wiring. Typical applications include equipment rooms, data centers, manufacturing facilities, and commercial buildings where cables must transition from a horizontal tray run to a vertical or angled drop. This fitting is suited for installations requiring organized cable egress points along a tray runway.
Designed as an OEM-style accessory fitting for cable tray runway systems with 3/8 inch by 1.5 inch rail dimensions. Consult B-LINE system documentation to confirm fitment with your specific tray series before installation.
Installation should be performed by a licensed electrician familiar with NEC cable tray requirements. De-energize all circuits in the tray run before installing or adjusting tray hardware. Standard hand tools are typically sufficient for fitting installation. Verify tray loading and support spacing comply with applicable NEC and local code requirements after adding dropout fittings.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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