Bonded Neutral vs Floating Neutral Generators

How to Avoid Tripping a Generator With a Bonded Neutral

By  | Generator Product Expert

Does your generator outlet trip every time you connect it to your home's transfer switch?

Are you frustrated with searching for a solution through numerous bonded neutral articles and generator forums?

The solution is simple: if you have a bonded-neutral generator with GFCI protected outlets, you'll need to get a GFI transfer switch to keep those circuits from tripping.  
 


How To Get the Right Switch

Knowing which transfer switch will perfectly match your generator isn't difficult. The chart below will help you determine whether you need a standard transfer switch or a GFI 3-pole transfer switch, based on your generator type. 

bonded and floating neutral chart

 

don't trip

What Does 'Ground' Mean?

Electricity, following the path of least resistance, will always try to find a way to ground itself or a way to release its electrons.

Since the earth makes a great path for electrons, that's where current will flow in the case of a lightning strike or a short-circuit. The danger comes into play when you are caught in-between that path and the electricity flows through you to get into the ground.

 

grounding wire (usually bare copper or green) is used to prevent shocks by routing rogue electrical currents away from a person, should a fault occur.  A ground wire is attached to a metal grounding rod buried in the earth.

Floating Neutral vs Bonded Neutral

Neutral wires aka "grounded neutral" are a source of confusion because they too are grounded; the difference being that they serve as part of the circuit by routing current back to the source.   

 

With a bonded neutral generator, the neutral is connected to the frame of the generator. Safety code requires we switch the neutrals away from the original source (your panel) and connect to the "first means of disconnect" when using the generator.

 

This ensures that electricity will flow properly through the neutral conductors and is delivered to one bonded location  eliminating unpredictable stray voltages caused by connecting to the ground twice. 

 

A floating neutral generator's neutral circuit is not connected to the generator's frame or the ground, meaning it is required to connect the neutral to your existing panel neutral. Both hot and neutral conductors in the receptacles are considered "hot" on these generators, and can both be used to eliminate the risk of shock by allowing electrical currents to connect to the generator frame simultaneously during a short circuit.

 
safer solutionWhat Does GFCI Mean?
GFCI stands for ground-fault circuit interrupter. This switch is needed to eliminate the ground loop and prevent the outlet from tripping.

Most built-in GFCI's found on portable generators are on the 15/20 amp 120-volt outlets, and not on the 120/240 outlets that are used to connect to home transfer switches.

 

The only time you'll need a GFI transfer switch to solve this kind of a problem is if your generator's 120/240 outlet features a GFCI that creates a ground loop.
 

 

dont modify

Don't Modify Your Generator!
Never manually disconnect a bonded neutral generator. It's not only dangerous but will void the manufacturer's warranty and against many regulations.

Using a GFI transfer switch will allow you to connect to your home's main panel without tripping, and you'll still be GFCI protected when using your generator out in the field or on the job site.

NEXT: Shop All GFI Transfer Switches

 
 

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