Sequoia / Tahoe Series User Manual California Instruments
46 M447352-01 REV-A
The input power cables and protective circuit breaker used must be large enough to handle the input
current and input voltage of the power source and must conform to local electrical codes. Consult a
qualified electrician prior to installation. Table 3-3 shows the minimum recommended wire size of the
cables that may be used per Sequoia/Tahoe Series cabinet based on temperature and refer to Table 3-4
for wire resistance and voltage drop. Note that wires must be sized to accommodate the worst-case
maximum current that may occur under low-line conditions. Local electrical codes may also require
different wire types and sizes. These ratings should also be used when selecting a circuit breaker or
equivalent disconnect device.
Cable lengths must not exceed twenty-five (25) feet. For lengths greater than 25 feet, calculate the voltage
drop from the following formula:
2 X DISTANCE X CABLE RESISTANCE PER FT. X CURRENT = VOLT DROP
Size Temperature Rating of Copper Conductor
AWG
60°C 75°C 90°C
Types: TW, UF
Types: RHW, THHW,
THW, THWN, XHHW,
USE, ZW
Types: TBS SA, SIS,
FEP, FEPB, MI, RHH,
THHN, THHW, XHH,
XHHW
Current Rating, A(RMS)
18 − − 14
16 − − 18
14 15 20 25
12 20 25 30
10 30 35 40
8 40 50 55
6 55 65 75
4 70 85 95
3 85 100 115
2 95 115 130
1 110 130 145
0 125 150 170
00 145 175 195
000 165 200 225
0000 195 230 260
Table 3-3: Suggested Input Wiring Sizes for each Sequoia/Tahoe Cabinet
Size,
AWG
A(RMS),
(90°C wire)
Ohms/100 Ft,
(One Way)
Voltage Drop/100 Ft,
(Column 2 x Column 3)
18 14 0.639 8.95
16 18 0.402 7.24
14 25 0.253 6.33
12 30 0.159 4.77
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