Utility service connections
4
Utility service connections
120V above ground
WARNING: The Home Connector is a
single-phase device. Do not connect
all 3 phases of a 3-phase feed.
▲
The following types of service connection
are primarily used in North America.
IMPORTANT! Before commencing on the
installation of the Home Connector it is
important you correctly identify the type
of utility service connection available on
site. If you are unsure about the type of
connection available at the service panel,
consult the local utility company, or
contact Tesla Motors for assistance.
Only three wires are connected, but care
must be taken that the service
transformer secondary connection is
definitely known, and the three wires from
the main circuit breaker panel are
correctly connected and labeled. The
illustrations in this section show the most
commonly used wiring formats.
Note:
The L1, L2, and GND outputs in the
following illustrations correspond to the
inputs on the Home Connector.
Ground (Earth) connection
Always connect the Neutral at the service
to earth ground. Ground fault protection is
not possible unless the Neutral (center tap
on the service transformer) is connected
to an earth ground.
If ground is not provided by the electrical
service, you must install a grounding stake
nearby.
The grounding stake must be connected
to the ground bar in the main breaker
panel, and Neutral connected to ground at
that point.
WARNING: Always follow local
electrical codes when installing the
grounding stake.
▲
220/240V Single Phase
120V
120V
NEUTRAL
(NOT USED)
L1
L2
GND
240V
208V 3-Phase, wye-connected
With a wye-connected secondary, any two
of the legs can be used to provide 208V to
the Home Connector. For example, L1 and
L2, or L1 and L3, or L2 and L3.
Caution: The unused leg (L3 in the
illustration) must remain open. Do
not connect to a Neutral bar, or to Ground.
The two used phases must each measure
120V to Neutral.
Caution: The center point of the 3
phases (normally used as Neutral)
must be grounded to earth at only one
point. This is usually at the Service Entry
Breaker Panel
Note:
A current-carrying Neutral is not
required.
120V
120V
NEUTRAL
(NOT USED)
GND
L1
L2
L3 (NOT USED)
208V
Home Connector Users Manual.book Page 4 Monday, April 26, 2010 12:38 PM
