What Size Breaker for Central Vacuum?
A central vacuum requires a 15A breaker with 14 AWG wire on a 120V dedicated (recommended) circuit.
🔌 Wire Length & Voltage Drop Check
Central Vacuum Wiring Guide — NEC Requirements
Central vacuum motors typically draw 10-14A. A dedicated 15A or 20A circuit prevents interference with other household circuits during use.
Pro Tip
💡 Install a dedicated circuit for the vacuum power unit. Low-voltage wiring for inlet valves is separate.
Why a 15A Breaker?
The central vacuum draws approximately 12A at 120V (1440W). A 15A breaker provides adequate protection.
Wire Sizing per NEC 310.16
For a 15A/120V circuit, 14 AWG copper is required per NEC Table 310.16 at 75°C. For runs over 75 feet, upsize to 12 AWG. Use our Wire Size Calculator and Voltage Drop Calculator.
Complete Parts List
To wire a central vacuum circuit: a 15A single-pole breaker, 14 AWG NM-B cable (Romex) for interior runs or THHN/THWN-2 in conduit for exposed runs, a NEMA 5-15 or 5-20 receptacle, cable clamps, and appropriate junction boxes.
Disclaimer: This guide is for reference only. All electrical work must be performed by or verified by a licensed electrician. Local codes may differ from NEC.