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ACM3P Series
Three-Phase AC Ammeters
TECHNICAL NOTES, CONTINUED
5. Wiring: All power supply and load wiring must be rated for the volt-
ages and currents they will carry and must comply with any code or
application-mandated requirements pertaining to the user’s speci?c
installation.
6. Supply Fusing, and Grounding: Wires speci?ed in the Functional
Speci?cations section must be used for making connections to AC-
M3P series ammeters’ TB1 terminal block. No connection is required
for earth/chassis ground.
ACM3P series ammeters are not internally fused. Terminal block TB1
is to be used only for powering the ammeter's internal circuitry; it
must not be used to supply power to external loads. The supply wires
feeding these power meters must be fused with a 0.5A/250V time
delay/time lag fuse, in accordance with applicable regulatory codes.
Wire insulation must be stripped to within ±10% of the stated dimen-
sions, and wires should be inserted into TB1 such that their insulation
is not pinched by the screw terminal.
7. Current Transformer Phasing: Since the ACM3P only measures
amperes, transformer phasing is not required. ‘Phasing’ refers to the
direction of the current-carrying wire as it passes through the primary
hole of each of the three built-in current transformers.
PANEL
8. Connector Torque Ratings: It is important to tighten TB1’s screw-
terminals to their rated torque speci?cation of 3.6 pound-inches
(0.4Nm). Proper tightening will minimize connector losses and ensure
safe, reliable operation.
9. Isolation: Except for the 2-56 thread metallic mounting studs, all of
the ACM3P ammeter’s internal components (printed circuit board,
resistor, capacitors, current transformers L1, L2 and L3’s secondary
leads, etc.) are at the ac-mains potential connected to TB1. ACM3P
ammeters are designed to be powered from one ac power-source
only. Any other connection schemes could introduce signi?cant mea-
surement errors.
The three built-in current transformers have a dielectric breakdown
rating of 2kV minimum, allowing them to safely monitor 480V,
3-phase ac mains currents. This dielectric rating pertains only to the
insulated load-carrying wire as it passes through the built-in CT’s
primary hole. However, attention must still be paid to ensure adequate
wire-to-wire spacings, and wire-to-metallic surface spacings. Prop-
erly rated wiring and fusing must be used for all installations, as noted
in Technical Notes 5 and 6 above.
IMPORTANT: Even though ACM3P ac ammeters can be used in 480V
current monitoring applications, the ac supply connected to TB1 must
never exceed the maximum rating of 264V/47-63Hz.
PANEL INSTALLATION
All connections to ACM3P ammeters must be made after the unit is
ACM3P
SIDE VIEW
2-56 Hex Nuts (4 places)
Tighten each nut to 15 to 20
ozf-in (0.106 to 0.140 N-m).
L1
L2
L3
securely attached to the panel, and with all associated load and sup-
ply voltages de-energized (off), using extreme caution and observing
all safety measures applicable to the user’s installation.
Care should be exercised when passing conductors through the
ammeter’s built-in current transformers L1, L2, and L3. The installed
wire-positions should be such that minimal mechanical forces are
applied to the current transformers, TB1, or to the ACM3P ammeter
itself. In high-vibration environments, it is strongly recommended that
strain reliefs be used for all wiring.
Using Figure 1 as a guide, carefully insert the ACM3P assembly into
the panel opening. From the rear of the panel, install and then tighten
the four #2-56 hex nuts over the threaded studs. Tighten each nut to
15 to 20 ozf-in (0.106 to 0.140 N-m). Use only the factory-supplied
hardware as the use of substitute hardware could result in an unsafe
installation and/or adversely affect the reliability of the installation.
The recommended panel thickness range that can be used with the
supplied hardware is 0.040 inches (1.0mm) to 0.25 inches (6.4mm).
Panel thicknesses outside of this range may require additional user-
supplied hardware or modi?cations.
Figure 1. Panel Installation
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MPM_ACM3P Series.A04 Page 3 of 6
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