The maximum acceptable material temperatures for electrically operated toys shall be as follows (Classes 105, 130, A, and B are from “Motors and Generators,” Standard MG-1-1967 1 published by the National Electrical Manufacturers Association):

1 Copies may be obtained from: National Electrical Manufacturers Association, 155 East 44th Street, New York, NY 10017.

MaterialDegrees C.Degrees F.
Capacitors(1)(1)
Class 105 insulation on windings or relays, solenoids, etc.:
Thermocouple method 290194
Resistance method110230
Class 130 insulation system110230
Insulation:
Varnished-cloth insulation85185
Fiber used as electrical insulation90194
Class AClass BClass AClass B
Insulation on coil windings of a.c. motors (not including universal motors) and on vibrator coils:
In open motors and on vibrator coils—thermocouple or resistance method 2100120212248
In totally enclosed motors—thermocouple or resistance method 2105125221257
Insulation on coil windings of d.c. motors and of universal motors:
In open motors:
Thermocouple method 290110194230
Resistance method100120212248
In totally enclosed motors:
Thermocouple method 295115203239
Resistance method105125221257
Phenolic composition 3150302
Rubber- or thermoplastic-insulated wires and cords 360140
Sealing compound(4)(5)
Supporting surface while the toy is operating normally90194
Wood and other similar combustible material90194

1 If the capacitor has no marked temperature limit, the maximum acceptable temperature will be assumed to be 65 °C. (149 °F.) for an electrolytic type and 90 °C. (194 °F.) for other than an electrolytic type.

2 The temperature indicated refers to the hottest spot on the outside surface of the coil measured by the thermocouple method.

3 The limitations on rubber- and thermoplastic-insulated wires and cords and on phenolic composition do not apply if the insulation or the phenolic has been investigated and found to have special heat-resistant properties, or if the insulation meets the thermal requirements.

4 40 less than melting point.

5 104 less than melting point.

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