Greenheck Make-Up Air Electric, Steam, Hot Water, Chlled Water, and DX Coils (457046) User Manual
Page 4
4
Supply Wire Size
(Not More Than 6 Conductors in Single Conduit
1
)
AWG or MCM
Max. Heater Line Current
2
Copper
3
Copper
3
AWG or MCM
Max. Heater Line Current
2
14
12
0000
184
12
16
250
204
10
24
300
228
8
36
350
248
6
52
400
268
4
68
500
304
3
80
600
336
2
92
700
368
1
104
750
380
0
120
800
392
00
140
900
416
000
160
1000
436
1
For 7-24 conductors in raceway or cable reduce allowable heater line currents to 87 1/2 % of those shown
above.
2
Based on 30
o
C (86
o
F) ambient temperature, for higher ambient temperature see N.E.C. table 310-16 and 310-
18 Note 13.
3
Based on 80% of ratings in table 310-16 N.E.C. for 75
o
C insulation.
De-rated Wattage For Low Voltage
Heater
Line
% of Heater
Heater
Line
% of Heater
Voltage
Voltage
Wattage and BTU
Voltage
Voltage
Wattage and BTU
480
460
92
208
200
92
440
84
190
83
277
265
92
120
115
92
254
84
110
84
240
230
92
220
84
208
75
200
69
Effect of Low Voltage on Wattage and B.T.U.:
The heating elements may be used on voltages lower than the design voltage of the heater; however, the wattage
and B.T.U. output will be reduced to the percentages listed in the table below.