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Table 37.1
Maximum acceptable temperatures
Table 37.1 revised January 27, 1995
Material and component parts Degrees
CF
1. Any point on or within a terminal box or compartment of a converter in which field-
installed conductors are to be connected including such conductors themselves
60 140
2. Field wiring terminals 75 167
3. Varnished cloth insulation 85 185
4. Fiber employed as electrical insulation 90 194
5. Wood and other combustible material 90 194
6. Phenolic composition employed as electrical insulation or as a part the deterioration of
which would result in a risk
150
a
302
a
7. Rubber- or thermoplastic-insulated wire and cord 60
a,b
140
a,b
8. Capacitor
Electrolytic 65 149
Other types 90
c
194
c
9. Sealing compound
dd
10. Class 105 insulation systems on coil windings of a relay, solenoid, and the like
Thermocouple method 90
e
194
e
Resistance method 110 230
11. Class 130 (B) insulation systems on coil windings of a relay, solenoid and the like
Thermocouple method 110
e
230
e
Resistance method 120 248
12. Class 105 (A) transformer insulation system on coil windings of a transformer
Thermocouple method 90 194
Resistance method 95 203
13. Class 130 (B) transformer insulation system on coil windings of a transformer
Thermocouple method 110 230
Resistance method 120 248
14. Selenium rectifiers 75
f
167
f,g
15. Silicon rectifiers 100
g
212
g
16. Solid contact, bus and connecting bar 90
h
194
h
17. Class 155 (F) insulation systems on coil windings of a transformer
Thermocouple method 135 275
Resistance method 145 293
18. Class 180 (H) insulation systems on coil windings of a transformer
Thermocouple method 150 302
Resistance method 160 320
19. Class 200(N) insulation systems on coil windings of a transformer
Thermocouple method 165 330
Resistance method 175 347
JANUARY 27, 1995 UL 458 51
Table 37.1 Continued on Next Page
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