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The Generac xp4000 - 3600 watt professional portable generator is available for purchase today.

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Generac XP4000 - 3600 Watt Professional Portable Generator

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Generac XP Series Professional Grade Portable Generator
Engineered specifically with contractors in mind

220cc Generac OHVI Engine - Designed Specifically For Generators
Provides longer life and longer maintenance intervals

Pressurized Lubrication System w/ Oil Filter & Low Oil Shutdown
Provides maximum safety for longer engine life

TruePower™ Technology - Less Than 5% THD
Provides clean, smooth operation of sensitive electronics

Full Panel GFCI Protection - OSHA & NEC 2011 Compliant
Must use GFI type manual transfer switch for panel connection
Not for use with interlock kit

Easy Access All-In-One Control Panel
Makes operating this generator an easy task

Large 4.7 Gallon Metal Fuel Tank
Provides up to 9.5 hours of run time @ 1/2 load

Hardened 1.25" Steel Tube Cradle & Cast Metal Corners
Combined with an integrated lifting eye for rugged durability

Easy-To-Access Maintenance Points
Makes routine maintenance easier and quicker

Includes Engine Oil & Maintenance Kit

  Model Number:5929
 Brand:Generac OHVI
 Starting System:Recoil Start
 HP/CC:220 cc
 Consumer Engine Warranty:3 Years
 Commercial Engine Warranty:3 Years
 Engine RPM:3600 RPM
 Low Oil Alert/Shutdown:Yes
 Cast Iron Sleeve:Yes
Product Specs
 Voltage120/240 Single-Phase
 Frequency:60 Hertz
 Auto Voltage Regulation:Yes
 Fuel TypeGasoline
 Rated Amps:15 Amps @ 240 Volts (Single Phase)
 Portability Kit:Sold Separately
 Tank Size:4.7 Gallons
 Run Time (50% Load):9.5 Hours
 Fuel Tank Material:Metal
 Fuel Gauge:Yes
 Decibel Rating @ 7m:Not Measured by Manufacturer 
 Idle Control:Yes
 Hour Meter:Yes
 Lifting Eye:Yes
 Battery:Not Applicable
 Assembly Required:No
 Weight:139 Lbs. (63.05 kilograms)
 Dimensions:30.5"L x 18.5"W x 23.25"H
(77.47 x 46.99 x 59.06 cm)
 Consumer Warranty:3 Years
 Commercial Warranty:3 Years
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  1 Question
Q: Jim,
I'm a licensed NH Electrician I have a Honeywell 7500Watt Portable Generator that will be used to supply selected loads in a non-separately derived residential application as outlined by the 2011 NEC. The tag on this generator indicated that the neutral is bonded to the frame. I need to know if this generator can be made into a floating neutral generator without voiding listings or warranty. If the answer is yes then where and how does the manufacture recommend the removal of the bond? And will the manufacture send a new label that indicates the generator is now a floating neutral generator. This will be an issue with any generator that has its neutral bonded to the frame portable or stationary. Any info that you can give me will be a great help.


Ron T.

by Ron Tasker from New Hampshire on January 08, 2012

A: The manufacturer does not recommend removing the bonded neutral from the generator and neither do I and just about 97% of generators on the market have a bonded neutral.

If you need to break the neutral in the generator backup set-up then you need to go with a GFI type transfer switch such as the Reliance Controls "X" series switches.....see link for details.

Reliance 30A GFI Transfer Panels

Reliance 60A GFI Transfer Panels

Note: Typically these switches are not required unless the large transfer switch outlet on the generator is GFI protected which is found on Professional generators such as the Generac "XP" models and not the "XG" model.

The biggest thing, is the fact that a generator has a bonded-neutral does not rule out compatibility with 2-pole transfer switches. The only time that a portable generator will not be compatible with a 2-pole transfer switch is if the generator has a bonded-neutral AND there is a GFCI breaker or GFCI mechanism protecting the receptacle they are using to connect the generator to the transfer switch.

Code does not require switching the neutral, so using a bonded generator with a Pro/Tran is perfectly fine as long as there is not a GFCI built into the receptacle that is being used. If there is a GFCI, it won't work because the breaker trips.

Any time a bonded-neutral generator is connected through a transfer switch to a house wiring system, there are two neutral-to-ground bond points: one at the main panel and one at the generator.

Having two bond points creates 'dual paths' on the ground and neutral, aka "ground loop", meaning the ground wire from the generator to the house panel will share everything with the neutral wire from the generator to the house panel.

This leads to there being a very small amount of current on the ground. If there is a GFCI breaker tied into the generator receptacle, it will sense this current on the ground and trip every time the generator is connected, even under No load.

* If the generator does not have a GFCI protecting the in-use receptacle, there will not be a trip and the generator will power circuits

A common argument against this is: "but the ground cannot have any voltage or current in any situation" - this is not true. The NEC states "the ground cannot carry 'objectionable' current".

The ground wire in question is the wire between the house panel and the generator, a small amount of power on this wire is not a safety concern in this type of application.

We have no record of a single injury, or a single inspection ever turned down, related to a bonded neutral generator connected to a home through a 2-pole transfer switch.

Note that this has been done historically for decades, using bonded generators without switching the neutral, ever since generators and transfer switches existed.

There was never a problem until about 10 years ago when generators started adding GFCI's (per OSHA job site requirements) and wiring them into the larger receptacles. GFCI's on the 15 amp 120v outlets are usually separate and not connected to the 4 wire 120/240 outlets, but it's a challenge to identify this without contacting the manufacturer. It varies greatly and is rarely specified in the owners manual.

The entire problem here is related strictly to the GFCI breakers built into bonded-neutral generators, not the fact the generator has the neutral bond alone. In knowing this, if we look at all of the portable generators that are bonded neutral, and then if we separate the models WITH a GFCI breaker protecting the 120/240 outlet, the percentage of these generators is extremely small. These are the only generators that will ultimately require a 3-pole transfer switch that breaks the neutral.

Breaking the neutral simply eliminates the ground loop (dual paths) between the generator and house panel created by having two bond points, and will eliminate the problem of the GFCI breaker tripping.

I hope this information was helpful.

by Mike, Product Expert

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