SB0504A Uninsulated Knife Probe of UL 749 Fig.4

9 Protection against accessibility to current-carrying parts
9.1 General
9.1.1 An appliance shall be provided with an ENCLOSURE of suitable material to isolate all parts that may present a risk of fire, electric shock, or injury to persons under any condition of normal use.

9.2 ENCLOSURES for other than BUILT-IN APPLIANCES
9.2.1 ENCLOSURES of appliances other than BUILT-IN APPLIANCES shall prevent access to internal current-carrying parts as specified in Clauses 9.2.2 to 9.2.8.
9.2.2 ENCLOSURES shall prevent a probe as shown in:
a) Figure 2 from touching uninsulated current-carrying parts that may present a risk of electric shock,
b) Figure 3 from touching insulated internal wiring, other than as specified in Clause 9.4.5, or film-coated wire, and
c) Figure 4 from:
1) touching an uninsulated current-carrying part or film-coated wire, and
2) relocating any non-current-carrying metal parts such that:
i) the parts touch an uninsulated current-carrying part or film-coated wire, or
ii) electrical spacings are reduced below the minimum values specified in Clauses 27 and 28.

9.2.3 The ENCLOSURE openings located in the top, back, sides, and front of the appliance and the interior surfaces of the washing compartment, including the door, that are accessible when the loading door is open shall comply with the requirements of Clause 9.2.2.
9.2.4 During the examination of the dishwasher interior surfaces, the dish racks shall be moved to any normal position giving the greatest accessibility to the probe, but shall not be removed from the appliance.
9.2.5 During the use of the probe on appliances weighing 22 kg (48.5 lb) or less when empty, there shall be sufficient clearance from supporting and other adjacent surfaces for unrestricted use of the probe (e.g.,the appliance can be tipped over).
9.2.6Where an opening in an ENCLOSURE has a minor dimension(see Clause 9.2.8):
a) less than 25.4 mm (1 in), an uninsulated current-carrying part or film-coated wire shall not be contacted by the probe illustrated in Figure 2, or
b) of 25.4 mm (1 in) or more, an uninsulated current-carrying part or film-coated wire shall be positioned from the opening as specified in Table 1, to reduce the likelihood of electric shock resulting from unintentional contact with such a part or wire.

9.2.7 A motor with an integral ENCLOSURE that has an opening with a minor dimension(seeClause 9.2.8):
a) of less than 19.1 mm (0.75 in) is acceptable, if film-coated wire cannot be contacted by the probe illustrated in Figure 3, or
b) of 19.1 mm (0.75 in) or more is acceptable, if a part or wire is spaced from the opening as specified in Table 1.

9.2.8With reference to the requirements in Clauses 9.2and 9.3, 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.