UL 1436-2016 pdf download – Outlet Circuit Testers and Similar Indicating Devices.
9 Spacings 9.1 There shall be a spacing through air or over surface of not less than 3/64 in (1 .2 mm) for devices rated 250 V or less and not less than 1 /8 in (3.2 mm) for devices rated greater than 250 V: a) Between uninsulated current-carrying parts of opposite polarity and between uninsulated current-carrying parts and dead metal parts that are likely to be grounded or exposed to contact by persons when the device is used in the intended manner; and b) Between grounded and grounding parts. Exception: AVTs shall comply with the creepage, clearance and through insulation requirements in the Standard for Electrical Equipment for Measurement, Control, and Laboratory Use; Part 1 : General Requirements, UL 61 01 0-1 and the Standard for Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 2-030: Particular Requirements for Testing and Measuring Circuits, UL 61 01 0-2-030. All mains connect circuits shall meet basic insulation requirements for opposite polarity circuits. 9.2 In measuring a spacing, an isolated dead metal part interposed between current-carrying parts of opposite polarity or between a current-carrying part and a grounded or exposed dead metal part is considered to reduce the spacing by the amount equal to the dimension of the isolated dead metal part. 9.3 For screwdriver and pen style voltage presence indicators, a suitable barrier or insulating material shall be placed around a resistor or the resistor body, to ensure minimum spacings and separation of circuits of the resistor leads. Exception: Resistor or resistor leads that are secured by space limitations, enclosure projections, mechanical means, or mounted on a printed wiring board, need not comply with this requirement.
10 GFCI Testers and AFCI Indicators 1 0.1 A normally open momentary contact switch shall be provided on a GFCI tester. The test button on the switch shall be provided with a barrier to guard against unintentional activation. The test button on the switch of a GFCI tester that employs a power-supply cord shall not be required to have a barrier to guard against unintentional activation. 1 0.2 A normally open contact switch shall be provided on an AFCI indicator. The test button on the switch shall not be required to have a barrier to guard against unintentional activation. 1 0.3 When an automatic timing circuit is provided in the GFCI tester, the timing circuit shall function to open the circuit in no less than six nor more than 7.2 s after the test button is activated. See 23.3.