12
Connecting to Single-phase Power
Figure 2 presents the basic connections to a single-phase system.
Be sure to follow the safety warnings of the previous
sections before making the connections.
Clamp your phase 1 current probe onto the "Hot" wire. Make a
metallic connection to neutral with the V
N
voltage lead. Similarly
connect the V
1
lead to "Hot". Since voltage now comes into ATPOL
II on V
1
and current is sensed by I
1
, the power and power factor for
this single-phase system will be available as phase 1 power and
phase 1 power factor.
Caution: Until you are certain that your voltage
connections to ATPOL II are correct, disconnect any current
probes. This is because ATPOL II and all of its connections
float at the potential of V
N
. If V
N
is "hot", there may be a breakdown through the insulation of
any attached probes.
Helpful Hint: How to Identify the "Neutral" lead.
Normal single-phase wiring follows the convention of "neutral" is the white wire, "hot" is the black wire,
"hot2" is the red wire, and "ground" is the green wire. If the wiring and your connections to ATPOL II
are as shown in figure 2, V
1N
will be some relatively large number like 120 volts and V
3N
will be a small
voltage like 3 volts. If you then reverse the ground and neutral leads, V
1N
will now read slightly less,
like 117 volts. If "hot" and "neutral" are reversed, then V
3N
will become a large number, like 117 volts.
Connecting to 120 V Outlet Adapter Box
The 120 V Outlet Adapter Box accessory offers a safe, convenient, and accurate way to monitor
voltage in a commercial setting or to evaluate power usage of appliances.
Figure 3 presents the connections to the Adapter Box. Simply plug the
adapter box into a wall socket and then attach the voltage and current
leads into ATPOL II. Each lead is labeled to eliminate errors in
connections.
Note: Make sure that the hot and neutral wiring being
measured is not reversed. If so, ATPOL II and its attachments will
"float" at 120 V.
Note: The 120 V Outlet Adapter Box is rated for continuous
duty of up to 15 Arms. Do not exceed this continuous load.
To evaluate the power usage of an appliance, simply plug the appliance
into the top of the 120 V Outlet Adapter Box after the other connections
have been made and verified. Even without an appliance plugged in,
the adapter box offers a convenient means of checking for transients or analyzing the harmonic content
of the incoming voltage.
ATPOL II
ATPOL II
Summary of Contents for ATPOL II
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