This power supply is equipped with a three conductor power cable. The third conductor is the ground
conductor. When the cable is plugged-in to an appropriate receptacle, the power supply is grounded.
Under no circumstances should this power supply be operated without an adequate ground
connection. If a two contact receptacle is encountered, it must be replaced by a three contact
receptacle, properly grounded. This operation should be done by a qualified electrician. It is
recommended to keep the AC input wires separate from the DC output and signal wires to avoid
interference.
To meet radiated EMI specification, the EMI suppressor clamp should be attached to the AC cable as
close as possible to theAC inlet of the power supply.
WARNING
WARNING
Some components inside the power supply are at AC voltage even when the
On/Off switch is in the “Off” position. To avoid the hazard of electric shock,
disconnect line cord and load and wait 2 minutes before removing cover.
Turn off the AC input power before making or changing any rear panel connection.
Make sure that all connections are securely tightened before applying power.
There is a potential shock hazard when using a power supply with a rated output greater than 40V.
Use load wiring with a minimum insulation rating equivalent to the maximum output voltage of the
power supply.
3.7 CONNECTING THE LOAD
3.7.1 Selecting wire size
Two factors must be considered in selecting wire size.
1. Wires should be at least heavy enough to avoid overheating while carrying the power supply load
current at the rated load, or the current that would flow in the event the load wire were shorted,
whichever is greater.
2. Wire size should be selected to enable voltage drop per lead to be less than 0.5V at the rated current.
It is recommended to minimize voltage drop on the wires to prevent excessive output power
consumption from the power supply.
Please refer to Tables 3-1 and 3-2 for maximum wire length to limit voltage drop by American and
European measurements respectively.
Table 3-1: Maximum wire length for
0.5V drop on lead (in feet)
wire
size
AW
G
5A
40
20
10
4
1
63
31
15
6
1.7
100
50
25
10
3
160
80
40
16
5
253
126
63
25
8
400
200
100
40
13
640
320
160
64
21
1016
508
254
102
34
14
12
10
8
6
4
2
0
2.526
1.589
0.9994
0.6285
0.3953
0.2486
0.1564
0.0983
Maximum length in feet -
to limit voltage drop to 0.5V or less
10A
20A
50A
150A
Resistivity Ohm/kf
t
Summary of Contents for ZUP Series
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