UFER ground question

[david]

McGraw-Hill?s
NATIONAL ELECTRICAL CODE 2011 HANDBOOK
K550.10 MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE HOME PARKS page 1313
ARTICLE 550. MOBILE HOMES, MANUFACTURED
HOMES, AND MOBILE HOME PARKS
?550.1. Scope. The provisions of this article cover the electric conductors and equipment installed within or on mobile homes and manufactured homes, and also the conductors that connect mobile homes and manufactured homes to a supply of electricity.
But the service equipment which is located ?adjacent? to the mobile home is covered in Art. 550 and all applicable Code rules on such service equipment?as in Arts. 230 and 250?must be observed.?


No doubt it is a structure but it is also designed to be mobile and article 550 is layout to deal with connecting a potentially mobile structure to a utility.

I think I lean more towards article 550 telling us what mobile home equipment, supply conductors and bonding conductors and provisions of connecting to the service equipment and grounding electrode conductor . 250.32 is called out in 550.32(A) and 250 is called out in 550.32 (B) (4) and (5) and the 550.32 (B) (2) calls out article 230 parts 1 through 7

550.32(B) (5) the manufacturer shall include in its written installation instructions one method of grounding the service equipment at the installation site. The instructions shall clearly state that other methods of grounding are found in Article 250.

Without written installation instructions on connecting a grounding electrode to a manufactured home your not allowed to do it. You?re not going to find that requirement in article 250

 

[GoldDigger]

McGraw-Hill?s
NATIONAL ELECTRICAL CODE 2011 HANDBOOK
K550.10 MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE HOME PARKS page 1313
ARTICLE 550. MOBILE HOMES, MANUFACTURED
HOMES, AND MOBILE HOME PARKS
?550.1. Scope. The provisions of this article cover the electric conductors and equipment installed within or on mobile homes and manufactured homes, and also the conductors that connect mobile homes and manufactured homes to a supply of electricity.
But the service equipment which is located ?adjacent? to the mobile home is covered in Art. 550 and all applicable Code rules on such service equipment?as in Arts. 230 and 250?must be observed.?


No doubt it is a structure but it is also designed to be mobile and article 550 is layout to deal with connecting a potentially mobile structure to a utility.

I think I lean more towards article 550 telling us what mobile home equipment, supply conductors and bonding conductors and provisions of connecting to the service equipment and grounding electrode conductor . 250.32 is called out in 550.32(A) and 250 is called out in 550.32 (B) (4) and (5) and the 550.32 (B) (2) calls out article 230 parts 1 through 7

550.32(B) (5) the manufacturer shall include in its written installation instructions one method of grounding the service equipment at the installation site. The instructions shall clearly state that other methods of grounding are found in Article 250.

Without written installation instructions on connecting a grounding electrode to a manufactured home your not allowed to do it. You?re not going to find that requirement in article 250

That language refers to grounding the service equipment. It does not address additiinally grounding the structure via a GEC at the sub panel on the structure.

 

[david]

That language refers to grounding the service equipment. It does not address additiinally grounding the structure via a GEC at the sub panel on the structure.

The article requires the service disconnect to be adjacent to the structure and has specific rules detailing grounding electrodes at the service equipment in detail addresses the feeder assembly that connects the separate structure to the adjacent grounded service equipment.

The article addresses in detail grounding the service equipment when (attached) on or in a manufactured home and addresses the grounding electrodes at the structure.

Article 550 is not silent on how to ground the separate structure and the rules in 550 addressed the grounding electrodes for manufactured homes. Since it is addressed as a separate structure in article 550 it is actually required to be a separate structure the separate structure issue has been addressed in article 550

 

[hornetd]

Examples please

Examples please

if lightning hits a CEE it will likely explode.

Can you offer any actual occurrences of this happening. Since the UFER Grounding technique was developed to protect ammo bunkers from lightning it seams unlikely that the consequences of a lightning strike to a UFER ground would be the very thing that Herbert G. Ufer was trying to mitigate.