Mobile home grounding system

[wireman3736]

Does anyone know the reasoning for not requiring a grounding electrode system at a mobile home. it's required at the service equipment but not required at a mobile home. I would think that a mobile home would fit the definition of a seperate structure per 250.32, from the service disconnect located outside of the mobile home, the slab would also be a good place for a concrete incased electrode. Just a thought.

 

[petersonra]

Does anyone know the reasoning for not requiring a grounding electrode system at a mobile home. it's required at the service equipment but not required at a mobile home. I would think that a mobile home would fit the definition of a seperate structure per 250.32, from the service disconnect located outside of the mobile home, the slab would also be a good place for a concrete incased electrode. Just a thought.

the slab is not a CEE as defined by the code.

 

[kbsparky]

.... the slab would also be a good place for a concrete incased electrode....

Not many mobile homes have a "slab" available.... And since they're mobile by definition, many (at least they used to) have a cord and plug connection. Kind of difficult to have any type of grounding electrode system with something that is cord and plug connected.

 

[wireman3736]

the slab is not a CEE as defined by the code.

I don't know if I agree with that as long as it is encased in 2" of concrete and the concrete is in contact of the earth, in the 05 hand book Exhibit 250.27 shows a cee in a slab,

In response to (kbsparky), In my area any new home in a park is required to be on a slab with wind protection tie downs. I believe also in the last 20 years I don't believe I have ever wired a trailer using a plug and cord assembly. they have all been hard wired in pipe.

Back to the intent of the original question, why wouldn't the mobile home as a seperate structure require a grounding electrode system at the trailer. I know they can be can be considered mobile but the still have to be wired for long term, even a temporary service requires a GE system.

 

[Jim W in Tampa]

Not many mobile homes have a "slab" available.... And since they're mobile by definition, many (at least they used to) have a cord and plug connection. Kind of difficult to have any type of grounding electrode system with something that is cord and plug connected.

Cord and plug models have not been made in 40 years.

 

[volt102]

550.16 gives the reason why we don't establish an electrode system for the mobile home.

Chapter 5 modifies Chapters 1-4

Jim
New Hampshire

 

[wireman3736]

550.16 gives the reason why we don't establish an electrode system for the mobile home.

Chapter 5 modifies Chapters 1-4

Jim
New Hampshire

That commentary in the hand book makes sense, I wonder why a metal shelled seperate building would not fall under this same requirement.

 

[Jim W in Tampa]

Like it or not most mobile homes in Florida have atleast 10 ground rods.While not intended to be ground rods there are several anchors with steel straps holding it down and that I beam has a bond to the grounding wire.I know thats not a legal connection but electric only sees a path.