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Wire and Cable Buying Guide
How to choose electrical wire and cable by insulation type, conductor material, ampacity, and installation environment.
Direct answer
Choose wire and cable by matching insulation rating, conductor type, and ampacity to your installation environment and code requirements.
Buyer decision rules
- Use copper for most branch circuits where flexibility and termination reliability matter.
- Verify insulation type and temperature rating before selecting THHN, XHHW, tray cable, or specialty cable.
- Match conductor size to load and distance to control voltage drop.
- Confirm wet, dry, sunlight, and conduit exposure requirements before ordering.
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FAQ
What is the main difference between building wire and cable assemblies?
Building wire is typically a single insulated conductor, while cable assemblies bundle multiple conductors with an overall jacket for specific applications.
When should I prioritize copper over aluminum conductors?
Copper is typically preferred for branch wiring and tighter terminations because it is easier to terminate and performs well in repeated maintenance conditions.