UL 291:2012 pdf download – Automated Teller Systems.
10 Electrical Components
10.1 Printed-wiring boards
101.1 The secwng of components to the board shah be made in a reliable manner and the between circuits shall comply with the requirements in Spacings, Sechon 11. The board shall be mounted so that deflection of the board during servicing shall not result in damage to the board or in a risk of fire or electric shock.
10.2 Coil windings
10.2.1 Insulation of coil windings or relays. transformers, and similar parts shall be of the moisture resistant type.
10.2.2 Film-coated wire is not required to be given additional treatment to prevent moisture absorption.
10.3 Switches
10.3.1 A switch provided as part of a product shall be rated for the current and voltage of the circuit that it controls when the product is operated under any condition of intended service.
10.4 Semiconductors
10.4.1 Semiconductors shall be rated for the intended application under all environmental conditions to which they will be exposed in service
10.4.2 The performance tesis of the complete product are inlended to show the effects of these conditions. The specified tests may be supplemented where conditions exceeding those represented by the tests indicated in this standard may be encountered.
10.5 Lampholders and lamps
10.5.1 Lampholders and lamps shall be rated for the current and voltage In the circuit in which they are used when the product is operated under intended service conditions.
10.5.2 The outer shell of any Lampholder in a product shall be connected to the identified (grounded) conductor, if it is in a high-voltage circuit.
10.5.3 A lampholder shall be installed so that uninsulated high-voltage live parts other than an outer shell will riot be exposed to contact by persons removing or replacing lamps
10.8.6 A countersunk part that is sealed shall be covered with a waterproof insulating compound mat will not melt at a temperature 1 5C (27F) higher than the maximum normal operating temperature of the assembfy, and at not less than 65C (149F) in any case. The depth or thickness ol sealing compound shall not be less than 1/8 inch (3.2 mm).
10.9 Mounting of components
10.9.1 All components of a product shall be securely mounted in position and prevented from turning or loosening if such motion may reduce electrical spacings or affect the performance of the product.
10.9.2 Uninsulated live parts, including terminals, shalt be secured to their supporting surfaces by methods other than friction between surfaces so that they will be prevented from turning or shifting in position if such motion may result in reduction of spacings to less than those required.
10.9.3 Friction between surfaces shall not be the sole means of preventing a device from turning in its mounting. A small stem-mounted switch or other device having a single hole mounting may be prevented from turning with the use of a lock washer having both spring take-up and an interference lock.
10.10 Motors
10.10,1 Each motor shall drive its maximum intended load during operation of the product without introducing a risk of electric shock or fire.
10.10.2 A motor winding shall resist the absorption of moisture.
10.11 Overload protection
10.11.1 A continuous-duty motor in a permanently-connected product, an automatically controlled fractional-horsepower motor in a product, the motor of a product intended to be operated remotely or unattended, a motor whose operation or failure to operate will not be evident to the operator, and a continuous-duty integral-horsepower motor, shall be provided with overload protection. The protection provided shall be as specified in 10.11.3. For a multispeed motor, the protection shall be effective at all speed settings. See also 10.11.4.
10.11.2 If overloading or stalling of a motor can result from manipulation of the controls in any part of the
system, that motor shall be provided with overload protection as described in 10.11.3.
10.11.3 The overload protection required in 10.11.2 shall consist of one of the following:
a) Thermal protection complying with the Standard for Overheating Protection for Motors. UL
b) Impedance protection complying with UL 2111. when tested as used in the application; or
c) Other protection that tests show is equivalent to the protection mentioned in (a).