What is the maximum distance that wiring can be run without support?

The maximum distance that wiring can be run without support is indeed 4.5 feet. This standard is set by the National Electrical Code (NEC), which governs the installation of electrical wiring to ensure safety and reliability. According to NEC regulations, non-metallic sheath cables, like Romex, must be secured at intervals not exceeding 4.5 feet. This measurement helps prevent stress on the wire, minimizes the risk of damage due to sagging or bending, and maintains electrical safety by ensuring that the cables are properly supported along their length.

The specification of 4.5 feet is a critical detail for electricians to remember when planning installations. By adhering to this guideline, electricians help ensure compliance with safety standards while also promoting the longevity of wiring systems. Understanding these codes is essential for any electrical contractor engaged in installations or renovations.