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Understanding Electrical Wire Color Codes

First on the electrical wire color code is black. “Black wires are most used as ‘hot’ wires in residential systems,” says ...
Electrical Construction & Maintenance

Critical Code Requirements for Residential Work

For many types of occupancies, the NEC has a dedicated Article in Chapter 5. For many types of installations, such as swimming pools or photovoltaic power systems, the NEC has a dedicated Article in ...
Nature

Stability of Wertheimer–Leeper wire codes as a measure of exposure to residential magnetic fields over a 9- to 11-year interval

The Wertheimer–Leeper (W–L) wire code is a construct used as a surrogate indicator of residential exposure to electromagnetic fields. However, little is known about how changes in electrical ...

How Copperweld® Building Wire Meets Growing Electrical Demands of Today's Homeowners

Dustin Smith, Copperweld BRENTWOOD, Tenn., Nov. 4, 2025 /PRNewswire/ --  Copperweld offers a future-ready solution that's ...
Security

Residential wiring 101

Just as residential and commercial fire alarm requirements differ significantly, so do the rules governing their wiring. The wiring types and unique exceptions allowed for residential (one- and ...
Electrical Construction & Maintenance

Code Q&A: Installing Wiring in Plenum Spaces for Environmental Air

A. The requirements of Sec. 300.22 apply to the installation and uses of electrical wiring and equipment in plenum spaces for environmental air. (C) Plenum Spaces for ...
Ars Technica

Residential Structured Wiring: California Building Code?

I'm preparing to run CAT5e through my crawlspace and through some walls. I'd like to do it to code if I can. I'd like to know what is required before I buy materials (to figure out if I need plenum ...