Industry News & Insights

Copper vs Aluminum Building Wire: Cost, Performance, and Code

For feeders and services, aluminum wire can cut conductor cost dramatically. For branch circuits, copper still...

SER vs SEU Cable: What's the Difference and Which One Do You Need?

SER is the 4-wire style for subpanels and downstream feeders; SEU is the 3-wire style for the service drop to ...

THHN vs THWN-2: What the Letters Mean and Why It Matters

Nearly every spool of THHN sold today is dual-rated THHN/THWN-2. Here's what each rating actually certifies, a...

SIS Wire Guide: Switchboard Wiring, NEC Rules, and Specifications

SIS is the wire the NEC expects inside switchboards and switchgear. Here's what makes it different from other ...

Metric to AWG / MCM Conversion Chart (mm² to Wire Gauge Guide)