Probe PA190 of UL 498 Figure 10.1

General
Iron or steel, plated or unplated, shall not be used for parts that are depended upon to carry current.

Exception No. 1:Stainless steel may be employed for a part not subject to arcing.

Exception No. 2: A steel that is corrosion-resistant (stainless) or is protected against corrosion by cadmium plating, zinc plating, or an equivalent protective coating, may be used for wire-binding nuts and screws if these parts are not depended upon to carry current.

Exception No. 3: Iron or steel current-carrying parts employed on a flatiron or appliance plug are not prohibited when protected against corrosion by a metallic plating or other metal coating. See 52.1.

A current-carrying part shall be restricted from turning relative to the surface on which it is mounted if such turning would adversely affect the performance of the device.

Uninsulated live parts shall be secured in place so that a reduction in the spacings below those required in 14.1 is not likely.

Contacts
Female contacts and associated live parts in the contact opening of an outlet device that can be touched by the probe illustrated in Figure 10.1 shall be recessed from the plane of the opening a distance not less than 1/4 of the maximum straight-line dimension of the opening, or 3/64 inch (1.2 mm), whichever is larger. That plane nearest the face of the device having the minimum opening for the pin or blade clearance is to be used to determine the minimum recess.

Bevels, tapers, or other expansions of the opening to the face of the device do not affect the measurement. The probe in Figure 10.1 is to be inserted point first as far as possible in the opening without distorting the perimeter of the opening. The maximum straight-line dimension is the maximum-length straight-line that will fit within the opening at the plane of measurement.

Exception No. 1: A cord-connector having a 1-15R configuration shall comply with 23.1.1.

Exception No. 2: Devices having openings that close upon removal of the attachment plug are not required to comply with this requirement.

Exception No. 3: Specific-purpose devices intended only for disconnecting use (see192.6), are not required to comply with this requirement.

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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