IGNITION TEMPERATURE VS TEMPERATURE MARKINGS IN GENERAL THE NEC
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Ignition Temperature vs
Ignition Temperature vs. Temperature Markings
In general, the NEC stipulates that an operating temperature or temperature range marking appears on equipment approved for Division 1 Hazardous Locations. For motors, U.L. further clarifies that this marking is to indicate the maximum temperature for all conditions including overload, locked rotor and single-phasing.
Per the NEC, the temperature range marking is in the form of an Identification Number shown in the below. U.L. calls this a Code Number.
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T-Codes and Associated Temperature |
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Identification Numbers |
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Maximum Temperature |
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T1 |
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450°C |
842°C |
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T2 |
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300 |
572 |
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T2A |
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280 |
536 |
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T2B |
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260 |
500 |
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T2C |
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230 |
446 |
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T2D |
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215 |
419 |
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T3 |
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200 |
392 |
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T3A |
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180 |
356 |
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T3B |
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165 |
329 |
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T3C |
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160 |
320 |
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T4 |
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135 |
275 |
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T4A |
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120 |
248 |
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T5 |
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100 |
212 |
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T6 |
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85 |
185 |
The user should make sure the temperature marking on approved equipment does not designate a temperature greater than the ignition temperature of the hazardous dust, fiber, gas or vapor of concern, even if the marked Class and Group meet the location requirements.
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