Load Center - enphase AC Combiner Box Quick Install Manual

7 Install CTs for Consumption Metering (optional)
The Envoy-S inside the AC Combiner Box is pre-wired at the terminal blocks for power and production metering connections. One solid-core current transformer
(CT) is provided for revenue grade production metering. You can install two optional split-core CTs to provide consumption metering. To do this, you must create
a protected route using conduit for the CT wires from the main load center to the Envoy-S. If you need to extend the wires, refer to the Enphase Envoy-S Installation
and Operation Manual at: enphase.com/support.
Note: Because of variance in load center design and main power feed, there may not always be enough space to install consumption metering CTs.
A) Make sure that the main load center wires are de-energized until you
have secured the CT wires in the terminal blocks.
B) Before running the CT wires through the conduit, use colored tape to
mark one of the CTs and the free end of its wires.
C) For the marked CT wires, connect the white wire to "IA•" and the blue
wire to "IA".
D) For the unmarked CT wires, connect the white wire to "IB•" and the blue
wire to "IB".
E) Tighten all connections to 5 in-lbs.
F) Clamp the marked CT on the load center feed wire Line 1 (matching
the Envoy's "A" voltage terminal) with the CT arrow pointing toward the
load (away from the grid).
G) Clamp the unmarked CT on the load center feed wire Line 2 (matching
the Envoy's "B" voltage terminal) with the CT arrow pointing toward the
load (away from the grid).
From AC Combiner
Consumption
CTs
To Grid

Load Center

DANGER!
Risk of electric shock. Always de-energize the load center
before beginning wiring.
DANGER! Risk of electrocution! Do not install CTs when cur-
rent is flowing in the sensed circuit. Always install CT wires
in the terminal blocks before energizing the sensed circuit.
Notes: It is important to match CT and sense voltage phases. To properly
measure power and energy, CT inputs must align with the respective
voltage inputs. Be sure to consistently identify and match the two AC
lines at two points: the main load center feed and the Envoy. Wire colors
(typically black and red) may not always consistently identify Lines 1 and
2. If in doubt, use a multimeter to check.
Envoy-S Terminal Block
Production Consumption
A N
IA● IB● IC● IA●
B C
IA IB IC

CU, 14 AWG, 75C
MEAS CAT III
OVC III
Digital Input
IB● IC●
1 2 3 4
REF CMN CMN
IA IB IC
Relay
NO
C
5
PD, B300
OVC II