The Rural Utilities Service (RUS) is part of the U.S. Department of Agriculture. Equipment requirements are spelled out in Federal regulations.
Excerpts appear below:
Sections 1910.302 through 1910.308 contain design safety standards for electric utilization systems
(b) Extent of application —(1) Requirements applicable to all installations. The following requirements apply to all electrical installations and utilization equipment, regardless of when they were designed or installed:
(e) Marking —(1) Identification of manufacturer and ratings. Electric equipment may not be used unless the following markings have been placed on the equipment:
(i) The manufacturer’s name, trademark, or other descriptive marking by which the organization responsible for the product may be identified; and
(ii) Other markings giving voltage, current, wattage, or other ratings as necessary.
(2) Durability. The marking shall be of sufficient durability to withstand the environment involved.
NEMA GR-1-2007 Standard for Grounding Rod Electrodes and Grounding Rod Electrode Couplings specifies that all copper-coated, galvanized and stainless steel ground rod electrodes “shall be permanently and legibly marked with the manufacturer’s identification and the catalog or equivalent designation, within 305 mm (12 in.) of the driving end of the ground rod electrode.”
This ANSI-approved standard applies to electrodes and electrode couplings that function according to the National Electrical Code® (NEC) and the National Electrical Safety Code (NESC). It covers design and performance requirements and provides recommendations for selections and use.
The contents and scope of GR 1-2007 may be viewed, and a hard copy or electronic copy purchased for $60, by visiting NEMA’s website at www.nema.org/stds/gr1.cfm, or by contacting IHS at 800-854-7179 (within the U.S.), 303-397-7956 (international), or 303-397-2740 (fax).