Transformer Voltage Demo
Interactive Simulator
Transformer Voltage Demo
Choose a service type and watch the available voltages change. This demo shows why a two-pole breaker might be 240V in one building, 208V in another, and why a high-leg delta panel needs extra care.
120/240V Single-Phase
A typical home has two hot legs and a neutral. Either hot leg to neutral is about 120V. Hot-to-hot is about 240V.
L1 to Neutral
120 V
L2 to Neutral
120 V
L1 to L2
240 V
Service Type
1Ø
This is the standard residential pattern: 120V for general circuits and 240V for large appliances.
What Would This Equipment See?
Select a load type to see whether the chosen transformer system is a good match.
120V receptacle: This is a normal load on a 120/240V single-phase system. Connect from either hot leg to neutral.
| Term | Meaning |
|---|---|
| Line to neutral | Voltage from one hot leg or phase to the grounded neutral conductor. |
| Line to line | Voltage measured between two hot legs or phases. |
| High leg | A phase in a high-leg delta system that measures about 208V to neutral and should not feed standard 120V loads. |
Field tip: always check the equipment nameplate and measure actual voltage before assuming a two-pole breaker is 240V.