Straight Probe Illustrated of UL 1017 Figure 3

Accessibility of live parts
To reduce the likelihood of unintentional contact that can involve a risk of electric shock from an uninsulated live part or film-coated wire, an opening in an enclosure shall comply with either (a) or (b):
a) For an opening that has a minor dimension(see Clause 4.2.5.5) less than 25.4 mm (1 in), such a part or wire shall not be contacted by the probe illustrated in Figure 2;
b) For an opening that has a minor dimension of 25.4 mm (1 in) or more, such a part or wire shall be spaced from the opening as specified in Table 1.

UL1017 Figure.2

Exception: A motor employed in an appliance intended for commercial use other than one used in either a hand-held appliance or a hand-supported portion of an appliance need not comply with these requirements if it complies with the requirements

With respect to a part or wire as mentioned in Clause 4.2.5.1 in an integral enclosure of a motor as mentioned in the exception to Clause 4.2.5.1:
a) An opening that has a minor dimension (see Clause 4.2.5.5) less than 19.1 mm (3/4 in) is acceptable if:
1)Film-coated wire cannot be contacted by the probe illustrated in Figure 3;
2) An uninsulated live part cannot be contacted by the probe illustrated in Figure 4;

UL 1017 Figure 3

UL1017 Figure.4

b) An opening that has a minor dimension of 19.1 mm (3/4 in) or more is acceptable if a part or wire is spaced from the opening as specified in Table 1.

The probes illustrated in Figure 2- Figure 4 shall be applied to any depth that the opening will permit and shall be rotated or angled before, during, and after insertion through the opening to any position that is necessary to examine the enclosure. The probes illustrated in Figure 2- Figure 4 shall be applied to any possible configuration and, if necessary, the configuration shall be changed after insertion through the opening.

The probes shall be used as measuring instruments to judge accessibility provided by an opening and not as instruments to judge the strength of a material.

With reference to the requirements in Clauses 4.2.5.1 and 4.2.5.2, the minor dimension of an opening is the diameter of the largest cylindrical probe having a hemispherical tip that can be inserted through the opening.

During the investigation of an appliance to determine whether it complies with the requirements in Clause 4.2.5.1 or 4.2.5.2, a part of the enclosure that can be opened or removed by the user without using a tool (to attach an accessory, to make an operating adjustment, or for other reasons) shall be opened or removed.

The connection of an accessible part to live parts, including a supply conductor, to facilitate the discharge of static electricity shall comply with (a) – (d). To determine compliance with the remaining requirements in this Standard, the resistors and associated circuitry shall be investigated as live parts. The lead of the resistor connected to the accessible parts shall be investigated as a dead metal part:
a) A minimum of two resistors connected in series shall be employed;
b) The resistors shall comply with the applicable requirements in C22.2 No.1and UL 1676;

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.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997