UL 73:1998 pdf download Motor-Operated Appliances
1 Scope
1.1 These requirements cover motor-operated appliances to be employed in accordance with the National ElectricaCode, NFPA 70.
1.2 These requirements also cover small utilization appliances, such as vibrators in which motion of an operating parts produced by electrical means
1.3 These requirements do not cover appliances rated more than 600 volts; nor do they cover appliances involvinguniversal motors rated more than 250 volts.
1.4 These requirements do not cover equipment intended particularly for the control of electric motors; separatormotors; nor electric clocks, fans, clothes dryers, washing machines, hair dryers, tools, waste disposers, dishwashersoffice appliances and business equipment, refrigerators, air conditioners, vending and amusement machines, hairclippers and shavers, snow movers, automotive and garage equipment, or other motor-operated appliances that arecovered by individual requirements
1 4 revised July 2，1998
1.5 An appliance that utilizes some other source of energy, such as gas or steam, in addition to electric energy will beinvestigated under these requirements and under such additional requirements as are applicable to the appliance underconsideration
.6A product that contains features, characteristics, components, materials, or systems new or diferent from thosecovered by the requirements in this standard, and involves risk of fire, electric shock, or injury to persons shall beevaluated using the appropriate additional component and end-product requirements to determine that the level ofsafety as originally anticlpated by the intent of this standard is maintained. A product whose features, characteristicscomponents, materials, or systems conflict with specific requirements or provisions of this standard shall not be iudaedto comply with this standard. Where appropriate, revision of requirements shall be proposed and adopted inconformance with the methods employed for development, revision, and implementation of this standard.
“1.6 revised Novemmber 9.1998
2 Glossary
2.1 For the purpose of this standard the following definitions apply.
2.2 AUTOMATICALLY CONTROLLED APPLIANCE – An appliance is considered to be automatically controlled if:
a) The repeated starting of the appliance, beyond one complete predetermined cycle of operation to the pointwhere some form of limit switch opens the circuit, is independent of any manual control;
b) During any single predetermined cycle of operation, the motor is caused to stop and restart one or moretimes，
c) Upon energizing the appliance, the initial starting of the motor may be intentionally delayed beyond normal.conventional starting; or
d) During any single predetermined cycle of operation, automatic changing of the mechanical load may reducethe motor speed sufficiently to reestablish starting-winding connections to the supply circuit.
2.3 LINE-VOLTAGE CIRCUIT – A circuit involving a potential of not more than 600 volts and having circuitcharacteristics in excess of those of a low-voltage circuit.