Section 3-608
INSTAL L ATION
OPERATING POWER I NFORMATI ON
This instrument can be operated from either a 120-
volt or 220-volt nominal line-voltage source, 48 to 440
hertz. In addition, three regulating ranges are provided
for each nominal line-voltage source.
�
To prevent damage to the instrument, always
check the line-voltage information recorded
on the rear panel before applying power to
the instrument.
POWE R CO R D IN FO R MATION
@
WARNING
This instrument is intended to be operated
from a single-phase earth-referenced power
source having one current-carrying
conductor (the Neutral Conductor) near earth
potential. Operation from power sources
where both current-carrying conductors are
live with respect to earth (such as phase-to
phase on a three-wire system) is not
recommended, since only the Line conductor
has over-current (fuse) protection within the
instrument.
This instrument has a three-wire power cord
with a polarized two-pole, three-terminal
plug for connection to the power source and
safety-earth. The safety-earth terminal of the
plug is directly connected to the instrument
frame. For electric-shock protection, insert
this plug only in a mating outlet with a
safety-earth contact.
Do not defeat the grounding connection. Any
interruption of the grounding connection can
create an electric-shock hazard. Before
making external connections to this
instrument, always ground the instrument
first by connecting the power cord to a
properly mated power outlet.
TABLE
3-1
Power-Cord Conductor Identification
Conductor
Color
Alternate Color
line
Brown
Black
Neutral
light Blue*
White
Safety Ea rth
Green/Yellow
Green/Yellow
"Tinned copper conductor.
The power-cord plug required depends upon the ac
input voltage and the country in which the instrument
is to be used. Should you require a power-cord plug
other than that supplied with your instrument, refer to
the standards listed in Table 3-2.
TABLE
3-2
Location of Power-Cord Configuration Information
Nominal Une Voltage
Reference Standards
120 V ac
1ANSI C73.11
2NEMA 5-1 5P (Hospital Grade)
220 V ac
ANSI C73.20
3ASC112
4BS 1363
5CEE 7, sheets IV, VI and VII
NEMA 6-15-P
1
ANSI-American National Standard Institute
2NEMA-National Electrical Manufacturer's Association
3
AS-Standards Association of Australia
'BS-British Standards Institution
5CEE-lnternational Commission on Rules for the Approval of
Equipment
For medical-dental applications, use NEMA 5-1 5-P
(Hospital Grade) plug for 120-volt operation, or NEMA
6-15-P plug for 220-volt operation.
3-1
