The Test Probe SM390 of UL 498 Figure 139.1

Probe Test
A tamper-resistant receptacle shall not permit contact to be made between the probe shown in Figure 139.1 and Figure 139.2 and any live part of the receptacle through the outlet slots when tested as described in this section.

Twelve previously untested devices are to be used for this test. The probe shown in Figure 139.1 is to be applied to each of the outlet slot openings of the receptacle with a force of 8 ounces (2.2N) in an attempt to bypass the tamper-resistance mechanism.

Small Test Probe SM390 of UL 498 Figure 139.1

A suitable indicating device (such as an ohmmeter, battery-and-buzzer combination, or the like) is to be connected between the probe and the wiring terminal of the outlet slot being tested to determine whether contact is made. The probe is to be manipulated in the outlet slots in any orientation that may permit access to live parts within the receptacle.

Twelve devices previously tested in 139.2 are to be used for this test. The probe shown in Figure 139.2 is to be applied to each of the outlet slot openings of the receptacle with a force of 10 pounds (45 N) in an attempt to bypass the tamper-resistance mechanism. A suitable indicating device (such as an ohmmeter, battery-and-buzzer combination, or the like) is to be connected between the probe and the wiring terminal of the outlet slot being tested to determine whether contact is made.

The probe is to be inserted in the outlet slots successively in three directions in any orientation that may permit access to live parts within the receptacle. The probe is applied for approximately 5 seconds in each of the three directions. During each application the gauge shall not be moved or rotated and shall be withdrawn when moving from one direction to the next.

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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