6
Building Electrical Service Inspection
Nominal
Minimum
Supply Voltage
Maximum
Supply Voltage
253
506
Percentage
Example:
L2 – L3 = 216 V
L1 – L3 = 213 V
Avg. Voltage: (220+216+213) / 3
649 / 3
216
Max. Deviation from Avg. = 220 – 216 = 4
% Voltage Unbalance = 100 x (4 / 216)
= 400 / 216
= 1.8%
•
AIRHANDLER VOLTAGE HEAT KIT MCA
DAX0904 and
DAX1204
None
None
Wire Sizing
• Wire size must carry the Minimum Circuit
Ampacity (MCA).
•
• Wire size allows for no more than a 2% voltage
unit.
°
Use this table
MAXIMUM ALLOWABLE LENGTH IN FEET TO LIMIT
VOLTAGE DROP TO 2%
Wire Size
(AWG)
10 15 20 25 30 35 40
45
12
122 81 61 49 NR NR NR
NR
10
193 129 97 77 64 55 NR
NR
8
307 205 154 123 103 88 77
68
6
489 326 244 195 163 140 122
109
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Protection (MOP)
AIRHANDLER VOLTAGE HEAT KIT MOP
DAX0904 and
DAX1204
None 20 / 20
100 / 110
None 15
30
60
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