Cut Sheet

Class I, Division 2, Groups A, B, C, D
Class I, Zone 2, AEx nA nR IIC (Z2)
Class I, Zone 2, Ex nR IIC (Z) V
Class I, Zone 2, AEx nR IIC (ZB)
Class II, Division 1 and 2, Groups E, F, G
Class III
Simultaneous Exposure (Class I, Division 2/
Class II, Division 1)
Fixtures Outside Type (Salt Water)
Type 4X
IP66
“T” Numbers Represent the Maximum Lamp Temperature for Class I, Division 2 Locations and
Maximum Surface Temperature Under Dust Blanket for Class II, Division 1 Locations
“T”
Number T1 350 325 T2 T2A T2B T2C T2D T3 T3A T3B T3C T4 T4A T5 T6
Temp.
Range
(˚ºF)
664-
842
619-
662
574-
617
538-
572
502-
536
448-
500
421-
446
394-
419
358-
392
331-
356
322-
329
277-
320
250-
275
214-
248
187-
212
185
Temp
Range
(ºC)
351-
450
326-
350
301-
325
281-
300
261-
280
231-
260
216-
230
201-
215
181-
200
166-
180
161-
165
136-
160
121-
135
101-
120
86-
100
85
➊ “T” numbers are for Groups E and F only.
V CSA Certification only.
“T” Numbers
Lamp
Supply
Wire
Temp.
(°F/°C) ➊
Ambient
Temp.
(°F/°C) ➊
Class I, Division 2
Class II, Division 1
Groups E, F and G
Simultaneous Exposure
Class I, Division 2 / Class II, Division 1
Watts Type Globe
Globe &
Reflector Refractor
Enclosed
Reflector Globe
Globe &
Reflector Refractor
Enclosed
Reflector Globe
Globe &
Reflector Refractor
Enclosed
Reflector
250 HPS
257/125 104/40 T2 T2 T2 T2 T3B T3B T4 T4A 325 325 325 325
257/125 131/55 325 325 T2 T2 — — T3B T4A — — T1 325
257/125 149/65 — — T2 T2 — — T3B T4 — — T1 350
400 HPS 194/90 104/40 350 T1 T1 350 T3 * T3 * T3C T3C T1 T1 T1 350
250 PSMH
194/90 104/40 T2A T2A T2B T2C T3 (EF) T3 (EF) T4 T4A — — — —
194/90 131/55 T2A T2A T2B T2C — — — — — — — —
194/90 149/65 — — — T2C — — — — — — — —
320 PSMH
194/90 104/40 T2B T2B T2B T2B — — T3C T3C — — — —
194/90 131/55 T2A T2A T2A T2B — — — — — — — —
350 PSMH
194/90 104/40 T2B T2B T2B T2B — — T3C T3C — — — —
194/90 131/55 T2A T2A T2A T2B — — — — — — — —
400 PSMH 194/90 104/40 T2A T2A T2B T2B — — T3C T3C — — — —
400
MHV
194/90 104/40 T2 T2 T2A T2A — — T3A T4 — — — —
Lighting
Lighting: EncLosEd and gaskEtEd — arEa — hid
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© October 2012
979
Mercmaster
™
III 400 Luminaire Thermal Performance
Class I, Division 2; Class II, Division 1; Simultaneous Exposure to Hazardous Conditions on Both Classifications
Temperature identification numbers of Mercmaster III – 400 Fixtures.