ELECTRONICS · REFERENCE GUIDE
Table of capacitor codes
Reference guide to table of capacitor codes for electricians: 3 checks to work through, the limits that apply and when to verify against the NEC and maker data.
US (NEC) only · NFPA 70 / NEC — locally adopted editionDefaults are US values. Verify the locally adopted NEC edition and project data.Official reference ↗
REFERENCE GUIDE
Before starting
- Common 3-digit code units are pF: 101 = 100 pF; 102 = 1 nF; 103 = 10 nF; 104 = 100 nF; 105 = 1 µF.
- Tolerance letters and voltage markings are separate and manufacturer-specific.
- Use the capacitor code decoder for three numeric digits.
This is a reference guide, not a sizing calculator or installation approval.
Method & assumptions
Reference workflow — project-specific verified data required
This is a reference guide, not a sizing calculator or installation approval.
Results do not check every aspect of an electrical installation. The calculators follow US (NEC) practice only; a regional preset changes defaults such as voltage and units, and no result certifies NEC compliance.
Sources and validation →Estimating and invoicing tool
Ampxa is developing an estimating and invoicing application for electrical contractors. The list below receives notice when it opens.