UL 291:2001 pdf download

UL 291:2001 pdf download.Automated Teller Systems.

5.6.6 Where the starting or restarting of a motor driving a moving part such as described in 5.6.3 isprovided by an automatic cycling device such as an overcurrent device or thermal protector,therequirement of 5.6.3 will require the use of a guard if the part is exposed when making operatingadjustments or changing replaceable parts or if the part is accessible without requiring the use of tools.5.6.7 With reference to 5.6.6,the scroll of a centrifugal blower may be used as a guard for the blowerwheel.
5.6.8 lf any part of the external enclosure of a product must be removed for operator servicing , that partshall be removed before the product is examined in connection with the requirement in 5.6.1.
5.6.9 The following parts may be used for securing doors,covers,and panels that are not opened orremoved for operator servicing if supplementary guards or similar parts are provided as described in 14.1-14.3:
a) Thumbscrews;
b) Finger latches;
c) Screwdriver-。 wrench-。and coin-operated latches;
d) Magnetic and spring latches that cannot be accidentally bumped open; and
e) Similar parts that result in reliable holding of a door or cover or support of a panel.
5.6.10 Panels as described in 5.6.9 are not to be opened or removed for the application of the probesmentioned in 5.6.4 and 5.6.5 in connection with the investigation of the accessibility of live or hazardousparts.See also 5.6.7.
5.6.11 In the enclosure of a unit an opening that does not permit entrance of 3/4-inch (19.1-mm) diameterrod may be used if a probe as illustrated in:
a) Figure 5.6 cannot be made to touch any uninsulated live part or hazardous moving partwhile inserted through the opening and
b) Figure 5.7 cannot be made to touch film-coated wire while inserted through the opening.
An opening that permits entrance of a 3/4-inch diameter rod may be used under the conditions describedin 5.6.6.See Figure 5.8.