IL42-4031C October 2012
2
ALPHA Plus and A3 ALPHA meters are available in FT-21 cases for the following wiring configurations:
• 3-phase 3-wire (2 element equivalent) - see Figure 2
• 3-phase 4-wire wye (2 1/2 element equivalent) - see Figure 3
• 3-phase 4-wire wye (3 element equivalent) - see Figure 4
Installation
The meter case should be mounted and permanently wired before the meter chassis is placed in the case. See Figure 1 for panel cut-out
information.
Use authorized utility procedures to install and service metering equipment. Dangerous voltages are present. Equipment
damage, personal injury and death can result if safety precautions are not followed.
Use circuit closing devices on current transformer secondaries. Dangerous currents and voltages are present. Equipment
damage, personal injury and death can result if circuit closing devices are not used.
Hardware supplied with the meter permits semi-flush mounting on panels up to 3/16-inch thick.
Cases with the terminal block output are not recommended for projection mounting due to the panel area required to be
cut out for output connector and terminal blocks.
Opening the test switches will disconnect the meter chassis from the case (and close incoming current circuits). Test clip leads can then be
attached to test lugs (above each jaw on the chassis) and to the switches as required. Test plugs are also available (from ABB Inc. - Power
Technologies, Coral Springs FL) to facilitate testing:
• FT Test Plug Enhancement, model # 1164046 - A 10-position plug for test using a separate supply source. Ten terminals bring out
connections to a metering device between the case and the meter chassis only.
• Individual Circuit Current Test Plug, Style # 7B4618G04 - An individual current circuit test plug for inserting leads to an external
metering device between the case and the meter chassis.
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