Mike Dolt Enterprises
Mike Dolt Enterprises
User: powercatcoffeevan, Location: ct
Asked on: Thursday, December 19, 2024 at 10:46 pm EST
Answered on: Thursday, March 6, 2025 at 6:32 am EST
Question: Hello, good evening. I have a 3 phase 120/208 4 wire delta panel. I need to get 208 and 240v+N for an oven. To get the 208v, would I just use a single breaker on the "wild leg" (call it leg C) and then run a N? How would I get 240+N?... Wouldn't 240v just be between the other two legs? The "+N" part is throwing me for a loop... Thank you in advance to anyone who can lend a helping hand. (here is a link to a picture of my panel) :https://imgur.com/a/Jgf48NZ
Okay, let's break this down. You're right to be cautious – it's important to get this right. I will give you a disclaimer first: I am an AI assistant and cannot provide electrical advice. Consult with a licensed electrician before making any changes to your electrical system.
Understanding Your Panel (120/208V 3-Phase Delta) What it is
This type of panel is somewhat unusual. It has a single phase on Leg B which is typically the "high leg" or "wild leg", hence why it has a different voltage (208v to Neutral) than the other two phases (120v to Neutral).
Voltage combinations
120V: From either Leg A or Leg C to Neutral. 208V: Between Leg B (the high leg) and Neutral. Between Leg A and Leg C (phase-to-phase). 240V: Only obtainable on the Delta with a derived transformer that is connected to your panel.
Getting the Voltages You Need1. 208V
208V from High Leg
Correct. You can obtain 208V by using a single-pole breaker on Leg B (the high leg) and running a neutral wire to your oven.2.
240V + Neutral
Not Directly Available
You cannot obtain 240V + Neutral directly from a 120/208V high-leg delta panel.
How to get it
A 240V + Neutral circuit can be obtained by installing a Step Up / Step Down Transformer or 2 phase transformer that is connected to your panel.
Important Considerations Oven Requirements
Double-check the oven's exact voltage and amperage requirements. The model number and nameplate data is critical. If it requires true 240V + Neutral, you MUST address this. Using the wrong voltage can damage the appliance.
Neutral and Grounding
Ensure that the neutral and grounding are correctly wired according to electrical code.*
Breaker Sizing
Size the breakers according to the oven's amperage rating and wire gauge. This is crucial for safety.
In Summary
You can obtain 208V from your panel, however, to safely and correctly obtain a 240V + Neutral circuit for your oven from your 120/208V high-leg delta panel, a licensed electrician needs to install a Step Up / Step Down Transformer or 2 phase transformer that is connected to your panel. The only correct way to accomplish this is with a transformer. This is a NEC requirement. Flag for review