A Brief Discussion of the Laws on Making and Using Electric Fences - Page 5

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610. Identification.: Any electric fence or portion thereof installed along a public highway or as a property-line fence shall be identified by approved markers or signs clamped to the fence wire or fastened to posts at intervals not greater than 200 feet.
611. Approved Marker.: An approved marker shall be as follows: A metal plate, wooden board, or other durable waterproof material not less than 4 inches by 8 inches, painted on both sides with a pure chrome-yellow background, with the following text on one or both sides: "ELECTRIC FENCE." The lettering of the text shall be in black letters not less than 1 inch high. Other lettering, with letters not more than 5/8 inch high, may be placed on the reverse of the side with the required lettering.

620. Control Device Required.: No fence shall be energized from any electric source except through an approved controller.
No device will be approved which fails to comply with these regulations or is of poor construction.
621. Number of Controllers.: No metallically continuous fence or set of electrically connected fences shall be supplied by more than one controller.
622. Maximum Supply Voltage.: Controllers shall not be used to operate electric fences from electric sources having a voltage rating higher than 125 volts (effective or rms value).

640. Output Limited.: The intent of this section is to require that the electric energy supplied to fences shall be so limited by controlling devices that the energy which the electric fence can deliver under the most severe conditions shall not be hazardous. To this end the limits have been fixed for the various types of control devices, as given in the following paragraphs.