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-1-19671 published by the National Electrical Manufacturers Association):
1Copies may be obtained from: National Electrical Manufacturers Association, 155 East 44th Street, New York, NY 10017.
| Material | Degrees C. | Degrees F. |
|---|---|---|
| Capacitors | (1) | (1) |
| Class 105 insulation on windings or relays, solenoids, etc.: | ||
| Thermocouple method2 | 90 | 194 |
| Resistance method | 110 | 230 |
| Class 130 insulation system | 110 | 230 |
| Insulation: | ||
| Varnished-cloth insulation | 85 | 185 |
| Fiber used as electrical insulation | 90 | 194 |
| Class A | Class B | Class A | Class 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 method2 | 100 | 120 | 212 | 248 |
| In totally enclosed motors—thermocouple or resistance method2 | 105 | 125 | 221 | 257 |
| Insulation on coil windings of d.c. motors and of universal motors: | ||||
| In open motors: | ||||
| Thermocouple method2 | 90 | 110 | 194 | 230 |
| Resistance method | 100 | 120 | 212 | 248 |
| In totally enclosed motors: | ||||
| Thermocouple method2 | 95 | 115 | 203 | 239 |
| Resistance method | 105 | 125 | 221 | 257 |
| Phenolic composition3 | 150 | 302 | ||
| Rubber- or thermoplastic-insulated wires and cords3 | 60 | 140 | ||
| Sealing compound | (4) | (5) | ||
| Supporting surface while the toy is operating normally | 90 | 194 | ||
| Wood and other similar combustible material | 90 | 194 |
1If 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.
2The temperature indicated refers to the hottest spot on the outside surface of the coil measured by the thermocouple method.
3The 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.
440 less than melting point.
5104 less than melting point.
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