UL 1017 Figure 25 Accessibility Probe

Protection against injury to persons of UL 1017
General
If the operation and maintenance of an appliance by the user involves a risk of injury to persons, protection shall be provided to reduce the risk.

When judging an appliance with respect to the requirement in Clause4.20.1.1, consideration shall be given to reasonably foreseeable misuse of the appliance.

The adequacy of a guard, a release, an interlock, and the like, and whether such a device is required, shall be determined from an investigation of the complete appliance, its operating characteristics, and the likelihood of a risk of injury to persons resulting from a cause other than gross negligence. The investigation shall include consideration of the results of breakdown or malfunction of any
one component, but not more than one component at a time, unless one event contributes to another. If the investigation shows that breakdown or malfunction of a particular component can result in a risk of injury to persons, that component shall be investigated for reliability.

Specific constructions, tests,markings, guards, and the like are detailed for some common designs. Specific features and appliances not covered shall be given appropriate consideration. See marking, Clause 11.

Sharp edges
An enclosure, a frame, a guard, a handle, or the like shall not be sufficiently sharp to constitute a risk of injury to persons during normal maintenance and use.

Exception: This requirement does not apply to a part or portion of a part needed to perform a working function, such as a pet grooming tool that has an exposed metal-toothed blade.

Whenever referee measurements are necessary to determine that a part as mentioned in Clause 4.20.2.1 is not sufficiently sharp to constitute a risk of injury to persons, the method described in UL 1439 shall be used.

Enclosures and guards
The rotor of a motor, a pulley, a belt, a gear, a fan, or other moving part that could cause injury to persons shall be enclosed or provided with other means to reduce the likelihood of unintentional contact. An opening in an enclosure or guard shall comply with either (a) or (b).
a) For an opening that has a minor dimension less than 34.9 mm (1.375 in), such a moving part shall not be contacted by the probe illustrated in Figure 2.See Clause 4.2.5.5 and Annex A.
b) For an opening that has a minor dimension of 34.9 mm (1.375 in) or more, such a moving part shall not be contacted by the probe illustrated in Figure 25 and Figure 26.See Clause 4.2.5.5 and Annex A.

Exception No. 1: A moving part or portion of a moving part that is necessarily exposed to perform the workfunction need not be enclosed but, when necessary, guarding shall be provided.

Exception No. 2: An opening in the integral enclosure of a motor employed in an appliance intended for commercial use, that is not used in either a hand-held appliance or a hand-supported portion of an appliance, is acceptable if a moving part cannot be contacted by the probe illustrated in Figure 4.

Exception No.3: An electronically controlled motor-driven brush that is necessarily exposed to perform its work function shall be marked in accordance with Clause 11.4.15.

During the examination of an appliance to determine whether it complies with the requirements in Clause 4.20.3.1, a part of the enclosure that can be removed without the use of a tool (to attach an accessory, to make an operating adjustment, or for other reasons) shall be opened or removed.

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

Tags：SMT-SU0252