Wiring and Protection
Extension Cord Power Loss Calculator
Extension Cord Power Loss Calculator is meant for one defined wiring and protection case. Run a separate case when the equipment, period, or connection changes.
Build the Cord loss case
Extension Cord Power Loss updates live after each input change.
Inputs to verify for Extension Cord Power Loss
Collect Load current, and Round-trip cord resistance from the same operating case before reading cord loss.
- Load current
- Enter load current in A. Default shown: 12 A.
- Round-trip cord resistance
- Enter round-trip cord resistance in Ω. Default shown: 0.42 Ω.
When load current is uncertain, run a low and high case instead of hiding that uncertainty in one entry.
How cord loss is calculated
The Cord loss value and any supporting metrics belong to this same Extension Cord Power Loss case, not to a nearby run with different inputs.
Read the Extension Cord Power Loss equation from the units on this page. A familiar symbol can shift meaning between DC, AC, energy, component, or billing work.
A clean Extension Cord Power Loss result confirms the arithmetic for cord loss; it does not prove the equipment rating or source data is the right one.
Only the entries shown on Extension Cord Power Loss feed cord loss. If another correction factor matters, keep it in the notes or make a separate run.
Fault Loop Impedance is a separate worksheet; carry over cord loss only with its units and source note.
Applying cord loss carefully
The result card gives a comparison point for Extension Cord Power Loss. Equipment ratings, safety margins, and manufacturer limits still need their own check.
Extension Cord Power Loss must stay connected to conductor material, installation method, ambient temperature, and code review.
A separate Wire Power Loss run is cleaner when that result becomes the real design question.
Records for round-trip cord resistance
Keep conductor material, insulation temperature, raceway method, ambient temperature, and protective device type with Extension Cord Power Loss.
If a later Extension Cord Power Loss run changes only load current, label it as sensitivity work. Several changed conditions deserve a new baseline.
When your notes point to Contact Resistance Loss, open it after saving this baseline so the two cases do not get mixed.
Detail checks for cord loss
Extension Cord Power Loss requires installation context. Conductor material, insulation rating, bundling, raceway fill, and terminal temperature can change the acceptable value.
When cord loss becomes an input to another worksheet, copy the value only after the units and source condition have been verified.