Current, voltage and thermal limits need separate checks
- Rated current
The manufacturer assigns the current under stated assembly conditions. Verify conductor size, contact loading and temperature-rise limits.
- Rated voltage
The assigned voltage relates to specified insulation and environmental conditions. Confirm AC or DC duty and the complete insulation requirements.
- Contact resistance
The mating interface has a finite resistance that can cause heating. State the contact condition and measurement procedure.
- AmpacityThis term
Allowable cable current follows the relevant temperature and installation limits. Area or AWG alone does not determine ampacity.
- Current derating
Permitted current can decrease as thermal conditions change. Use the curve and conductor configuration for the exact assembly.
- Voltage drop
Circuit impedance and current cause voltage drop. Include both conductors, connections and operating temperature in the assessment.
Current creates heating and voltage drop at conductors and contacts. Voltage rating concerns the defined insulation duty, while allowable current depends on the complete thermal and installation conditions.
Conceptual traces and paths without numerical ratings. Use the exact assembly data, test conditions and installation factors; these sketches are not derating curves for a product.