Flush Receptacle PA215A with UL 498 Figure 31.1

Flush receptacles
The grounding terminal of a grounding-type flush receptacle shall be spaced at least 1/4 inch (6.4mm) from any ungrounded live part (associated with other than a white grounded terminal) exposed to contact by a grounding conductor in the outlet box. Live parts accessible from within the cavity of an outlet box are considered exposed to contact by a grounding conductor if they can be contacted by the probe illustrated in Figure 31.1.

The spacings shall be measured through air and over both insulating and conductive surfaces with the receptacle wired as intended with the maximum anticipated conductor size. They shall be measured from any point on the grounding terminal that may contact the clamped grounding conductor as in the case of a wire-binding screw terminal, or from any point on the perimeter of an opening to receive a grounding conductor in the case of an enclosed terminal.

Flush Receptacle PA215A with UL 498 Figure 31.1

A flush receptacle shall be provided with means for mounting in a standard flush-device box or on a standard outlet box cover.

A yoke, strap, or mounting ears shall be formed of steel that is a minimum 0.040 inch (1.02 mm) thick.

Exception No. 1: The minimum thickness at scores or perforations provided so that extension plaster ears may be broken off when not needed is not required to comply with this requirement.

Exception No. 2: If nonferrous metal is used, it shall provide mechanical strength and rigidity equal to that of 0.040 inch thick (1.02 mm) steel.

A steel yoke, strap, or mounting ears shall be protected agalnst corrosion by a copper-plated or oxidized finish.

Exception: A zinc or cadmium coating not less than 0.00015 inch (0.0038 mm) thick as determined in accordance with the requirements in the Standard for Metallic Outlet Boxes, UL 514A, or other coatings determined to possess equivalent corrosion protection properties are not required to comply with this requirement.

A screw provided with a receptacle for use in mounting the device to an outlet box or other enclosure shall not project more than 7/8 inch (22.2 mm) beyond the strap or cover and shall have a flat or blunt end. The end of the screw may have thread-cleaning slots or grooves but shall not have any burrs, fins, or other sharp edges that could damage wiring.

A receptacle that is provided with an adjustable screw, or screws if more than one is provided, or any other adjustment hardware shall not project more than 7/8 inch (22.2 mm) beyond the plane of the mounting yoke where secured to the outlet box. The end of the adjustable hardware shall have a flat or blunt end. If an adjustment screw is provided, it may have thread-cleaning slots or grooves but shall not have any burrs, fins, or other sharp edges that could damage wiring.

The adjustment means of an adjustable receptacle shall not permit installation in an application where the front edge of the installed outlet box, plaster ring, extension ring, or outlet box extender is set back from the finished surface (e.g. drywall) more than a 1/4 inch (6.0 mm). Compliance is checked by measurement.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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