All markings for electric signs are to be visible during installation and available afterwards.
All permanently connected signs are to include their installation instructions, including mounting details and wiring methods. These instructions may be provided in the form of drawings and/or diagrams. They are to be marked on, attached to or shipped with the sign, so they are available throughout installation and setup.
Electrical signs of very large size, such that it would be impractical to ship them in one carton or full assembled, are permitted to be divided into sections. Each major subassembly needs to bear an ‘electric sign section’ listing mark.
Sign section subassemblies are to be marked where readily visible during installation and to identify the following:
- Splice enclosure.
- Conductors to be spliced.
- Voltage rating of the splice insulation.
- Section number.
Also, for all section signs, the following marking is required to be provided, in accordance with NEC Section 600.4(E): “Installation and assembly required; see installation instructions.” While CEC does not contain the same requirements, Rule 2-100 refers to “other markings necessary to ensure safe and proper operation.”
As suggested, the section sign installation instructions are to be either attached to each subassembly or shipped with the sign. The instructions must contain the following:
- A drawing depicting the arrangement of the subassemblies.
- Written instructions for the physical installation of the subassemblies and the mechanical connections between them.
- A drawing depicting the wiring arrangement of the subassemblies and the components necessary to complete the electrical connections between them.
- Any conditions of use required for the subassemblies.
- Any conditions of use for components required to complete the wiring.
- Written instructions for the field wiring between the subassemblies and any components.
- The specified connection to the source of the electrical supply.
- The requirements for grounding and bonding the sign.
Prepare for inspection
So, NEC Article 600, UL 48, CEC Section 34 and CSA-C22.2 No. 207-M89 all identify specific sign marking requirements, as well as the requirement for including installation instructions. Code authorities are tasked with verifying all of the required markings are present and reviewing each sign’s installation instructions, as part of their inspection process.
Jeffrey A. Fecteau is lead regulatory engineer for Underwriters Laboratories (UL), which tests and certifies products for safety. For more information, contact him via e-mail at jeffrey.fecteau@ul.com or visit www.ul.com.
