Change Summary

• Screws for snap switches must be either machine screws matching the thread gage or size that is integral to the box.
• Fastening means that are in accordance with the manufacturer’s installation instructions are acceptable.
• A new last sentence has been added to this section to address snap switch fastener screws

Expert Analysis

This section addresses switches in flush box installations and requires the mounting yoke or strap of the switch to be seated against the box or plaster ring. A new last sentence specifies that screws used for attaching snap switches to the box, shall be either machine screws matching the thread gauge or size integral to the box or be in accordance with the manufacturer’s instructions. Use of drywall screws and other screws that are not intended for fastening snap switches or other equipment to boxes is not acceptable and can result in damage to the box and inadequate fastening of the device. Manufacturer’s installation instructions cover this in most cases for listed boxes and equipment, but the additional text helps clarify this requirement. Code Making Panel-9 incorporated the proposed concepts into the additional sentence and accounted for nonmetallic outlet boxes and product standards that might recognize use thread forming screws for attachment of snap switches provided they meet the performance requirements in the applicable standard. This type of screw is typically used with nonmetallic boxes and is often supplied with the box. Drywall screws and other inappropriate screws are not permitted for use in fastening snap switches to boxes or plaster rings.

Switches
Leviton offers a broad selection of industrial, commercial and residential switches, with current ratings from 15 amps up to 100 amps. Switch varieties include single-pole, double-pole, three-way, four-way, lighted handle, pilot light, locking, maintained and momentary contact, motor starter, safety-disconnect and Decora® designer-styled devices.