16 CFR 1505.8: Maximum acceptable material temperatures.

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):

Material Degrees C. Degrees F.

Capacitors (1) (1)

Class 105 insulation on windings or relays, solenoids, etc.:

Thermocouple method 2 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 method 2 100 120 212 248

In totally enclosed motors—thermocouple or resistance method 2 105 125 221 257

Insulation on coil windings of d.c. motors and of universal motors:

In open motors:

Thermocouple method 2 90 110 194 230

Resistance method 100 120 212 248

In totally enclosed motors:

Thermocouple method 2 95 115 203 239

Resistance method 105 125 221 257

Phenolic composition 3 150 302

Rubber- or thermoplastic-insulated wires and cords 3 60 140

Sealing compound (4) (5)

Supporting surface while the toy is operating normally 90 194

Wood and other similar combustible material 90 194

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.