Leviton Mini Meter MMU Manuel D'installation page 15

4 INSTALLATION INSTRUCTIONS
4.5 Variations and Installation of Current Transformers
General Requirements
• Leviton provided CT leads are 48 inches minimum. Wire insulation should be
stripped so that the bare conductor length that connects to the meter terminal
block does not exceed 0.300 inches.
• CTs should be securely fastened such that they will not slide down to live
terminals.
• Wires should be tightened so that they are held snuggly in place, but do not to
overtighten, as this may compress and weaken the conductor.
• For 1 or 2 Ph 3-Wire electrical panels, current and voltage inputs must be
installed "in phase" for accurate readings (e.g. CT1 on Line 1, CT2 on Line 2);
see Figure 11.
• For 3 Ph 4-wire electrical panels, see Figure 12 and follow factory-provided
meter schedules for correct CT locations.
CT Variations
• Leviton solid core CTs (Figure 8): In accordance with CT label, the LINE side
of CT must face incoming Line. White lead connects to X2 of CT connection
(CT1:X2 or CT2:X2). Black or red (solid or striped) lead connects to X1 of the
corresponding CT connection (CT1:X1 or CT2:X1).
Installing solid core CTs
1. Route CT wires through the conduit if not already done.
2. Trim the wire to the appropriate length to avoid coils of excess wiring.
3. At MMU, strip insulation from wires to approximately .300 inches.
4. Connect CT leads to the appropriate meter as described above.
5. With power turned off, disconnect each monitored conductor and slide
on a CT, ensuring the CT is correctly oriented as noted above.
6. Reconnect the conductors.
Figure 8 - Leviton Solid Core CTs
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