Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 49
Figure 3-8: External sense Connector
CAUTION!
The output of the power source is isolated from the input line and floating with respect to
chassis ground. If needed, either side (HI or LO) may be grounded.
If the EUT changes frequently, you may want to consider using some quick disconnect scheme external
to the chassis so it will not be necessary to power down the UUT and remove the rear covers. This can
take the form of a panel-mounted socket (1 or 3 phase) of sufficient current and voltage rating. (Not
supplied with Sequoia/Tahoe Series)
The output power cables must be large enough to prevent a total voltage drop exceeding 1% of the rated
output voltage between the power source and the load.
Table 3-5 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 3-6 for wire resistance and voltage drop. Note that
wires must be sized to accommodate the maximum available current. This may be a function of the voltage
range and phase mode on Sequoia/Tahoe models. If the unit has more than one output voltage range,
size the wires for the lowest available voltage range as the currents will be highest in that range.
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
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