Ground Wire Size Calculator by Breaker
Equipment grounding conductor size starts from the upstream breaker or fuse rating, not the normal load current. The calculator then applies material and voltage-drop upsize context.
ground wire size calculator by breaker grounding conductor size by breaker equipment ground size calculator
Table-row basis
OCPD rating -> equipment grounding conductor row
Upsize adjustment
CM_required = CM_table * phase_conductor_upsize_ratio
Scope caution
This is for wire-type equipment grounding conductors. Grounding electrode conductors, bonding jumpers, service bonding and local amendments are separate checks.
Related pages
- Transformer kVA calculator - load kVA, design margin and standard size rounding.
- Conduit fill calculator - raceway fill from conductor count, area and conduit size.
- Voltage drop calculator - feeder voltage drop and conductor-size screening.
- Short-circuit current calculator - available fault current from transformer impedance.