This guide has been developed based on using Listed and Recognized components to build Listed neon signs. Since there are many products in the world directed at the neon sign industry we are limiting this guide to the products and procedures, which have been tested to the applicable UL Standards. 

UL Standards: 
UL 814: The Standard for Gas-Tube Sign and Ignition (GTO) Cable. 
UL 2161: The Standard for Neon Transformers and Power Supplies. 
UL 879: This Standard for Electrode Receptacles for Gas-Tube Signs. The scope of this standard has been proposed to be changed to include all the sign and outline lighting related accessories and parts. Currently, other standards are employed for these products. 
UL 48: The Standard for Electric Signs. 

RECOGNIZED COMPONENTS: Components evaluated for use in a Listed sign that have conditions of acceptability placed on their use. Refer to the sign accessories manual (SAM) for the conditions of use (Conditions of Acceptability) for many of the components typically used in electric signs. 

LISTED: Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or services meets identified standards or has been tested and found suitable for a specified purpose. The means for identifying listed equipment may vary for each organization concerned with product evaluation, some of which do not recognize equipment as listed unless it is also labeled. Use of the system employed by the listing organization allows the authority having jurisdiction to identify a listed product. 

CONDITIONS OF ACCEPTABILITY (Conditions of Use): The intended use and limitations placed on a component when used in a sign or outline lighting. 

NFPA 70: The National Electric code 

APPROVED: Acceptable to the authority having jurisdiction. 

The following quoted directly from the National Electric code: 
Authority Having Jurisdiction”. The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure. 

"FPN: The phrase “authority having jurisdiction” is used in NFPA documents in a broad manner, since jurisdictions and approval agencies vary, as do their responsibilities. Where public safety is primary, the authority having jurisdiction may be a federal, state, local, or other regional department or individual such as a fire chief; fire marshal; chief of a fire prevention bureau, labor department, or health department; building official; electrical inspector; or others having statutory authority. For insurance purposes, an insurance inspection department, rating bureau, or other insurance company representative may be the authority having jurisdiction. In many circumstances, the property owner or his or her designated agent assumes the role of the authority having jurisdiction; at government installations, the commanding officer or departmental official may be the authority having jurisdiction.” 

“600.3 Listing. Electric signs and outline lighting-fixed, mobile, or portable shall be listed and installed in conformance with that listing, unless otherwise approved by special permission.” 

(A) Field Installed Skeleton Tubing. Field installed skeleton tubing shall not be required to be listed where installed in conformance with this code.” 

The national electric code and specifically chapter 6, article 600 refers to the installation of electric signs and outline lighting in part I and field installed skeleton tubing in part II. Chapters I–IV of the code applies to all installations; chapters V–VII modify chapters I–IV for a specific purpose.

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