Come to think about it you'd ground it just like an RV running a generator. http://www.rv-motorhome-a...com/power-systems.html
The RV grounding actually takes place at the power receptacle where we plug in. Using shoreline cords, power adapters and faulty extension cords can result in reversed polarity so the 110 wiring in the RV NEUTRAL is totally isolated from ground.
Why? In the case of reverse polarity a short could feed power to neutral and the RV chassis if neutral and ground were connected creating a dangerous possibility. Thus the difference in wiring. (Note: AC ground in RV goes to RV chassis) Another site and good answer
The purpose of using a ground rod on a service is for lightning protection not to handle fault current, the ground wire is bonded to the neutral at the point of service so fault current has a good solid low resistance path back to the point of generation. The ground rod will provide a path but it will be high resistance and vary depending on the moisture in the soil, the ground rods most important job is the help with lightning protection because the point of generation is the earth not the generation plant. When you are running your generator it is the point of generation so the ground wire and frame should be bonded to the neutral at that point. When you are shore power the separate ground wire not neutral will go all the way back to the point of service where it's bonded to the neutral and ground rod for a good fault current path. So no you don't need a ground rod unless you are worried about lightning and then you don't want to be the best ground around anyway, your tires are good insulators and just put plastic or wood pads under your stabilizers to help isolate the rig from the ground and enjoy your RV trips.
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May 02, 2010, 09:04:55 AM »
Actually the National Electrical Code (NEC) likes to have an electrical subsystem (which would include an RV) bonded to ground via the feed, which is the shore power line in this case. However, they do make some exceptions for farm/barn wiring an such, so the definition of the "right" answer for an RV could be argued.
When using a portable generator, a local ground rod MAY be recommended in some situation but generally is NOT. See the OSHA article below for a summary - much easier to read than the NEC. The generator installed in a motorhome is not really portable, but it does meet the OSHA requirements by having everything grounded to its chassis, so no earth ground is required. Bottom line is that you need not worry. http://www.osha.gov/OshDoc/data_Hurricane_Facts/grounding_port_generator.pdf
Are you using a portable genset in the toyhauler or is it factory-installed? If factory installed, it likely meets the requirements of NEC and OSHA for generator wiring. The RVIA standards cross reference to the NEC for electrical wiring.
<message edited by Dr of BBQ on Wed, 04/25/12 9:20 AM>