The cable cross-section must be suitable for the maximum input current of the
instrument. The ground cable must have the same cross-section as the phase cable.
Safety agency requirements dictate that there must be a way to physically disconnect
the AC mains cable from the unit. A disconnect device, either a switch or circuit breaker
must be provided in the final installation. The disconnect device must be close to the
equipment, be easily accessible, and be marked as the disconnect device for this
equipment. It must meet the input ratings requirements listed in the following table.
Models N69143A, N69145A, and N69146A
Either a delta-type or a Y-type AC mains distribution can be used, provided that the correct line-to-line
voltage is applied (see above). Do not connect the neutral wire on Y-type AC mains distribution. An
earth-ground to chassis-ground connection through a separate conductor must always be provided.
SHOCK HAZARD The instrument requires a chassis ground connection through a
separate conductor. The AC mains must include an earth ground connection.
l
If attached, remove the safety cover from the unit.
l
Insert the terminated ends of the power cord through the
strain relief of the safety cover.
The safety cover strain relief bushing can accommodate a
wire cable or individual wires.
The minimum inside diameter is 15 mm (0.6 in.).
The maximum inside diameter is 25.4 mm (1 in.).
l
Do not tighten the strain relief until all wire connections
are complete.
l
Attach the safety cove to the unit.
l
Attach the ring-terminated line wires to the AC mains ter-
minals (U.S. color code shown). The bolt diameter is M5.
Place the ring terminals between the star washers. Con-
nect the ground wire to the chassis stud
below
the AC line
filter assembly.
If provided, do not connect the neutral wire.
l
Tighten the terminal bolts to 23 in-lb (2.6 Nm).
l
Note that on earlier units, the AC mains terminals have
hex-nut terminal connections.
2 Installing the Instrument
60
Keysight N69100 Series Operating and Service Guide
