Hioki 2300 Smart Site, Instruction Manual, Page: 187 / 366

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9 2331-20 POWER METER MODULE
9.3.5 Connecting to the Measured Line
• In order to prevent electric shock and short-circuit acci-
dents, shut off the power to the line to be measured before
connecting the clamp sensors and voltage cords.
• The inputs of the U INPUT terminals U1-U3, and the N termi-
nal are not insulated. To prevent electric shock, do not
touch the terminals.
• The CLAMP SENSOR INPUT terminals are not insulated
from the U INPUT terminals. Be careful to avoid electric
shock and short-circuiting when using the U INPUT termi-
nals.
• To avoid short circuits and potentially life-threatening haz-
ards, never attach the clamp sensor to a circuit that oper-
ates at more than the maximum rated voltage, or over bare
conductors.
• Clamp sensor should only be connected to the secondary
side of a breaker, so the breaker can prevent an accident if
a short circuit occurs. Connections should never be made
to the primary side of a breaker, because unrestricted cur-
rent flow could cause a serious accident if a short circuit
occurs.
• If the secondary circuit is opened while electricity is being
sent through the CT, very high and dangerous voltage may
be generated at the secondary side terminal.
• Be sure to cover the measured line when live to avoid elec-
tric shock and short-circuiting.
When the clamp sensor is opened, do not allow the metal
part of the clamp to touch any exposed metal, or to short
between two lines, and do not use over bare conductors.
• Avoid stepping on or pinching cables, which could damage the
cable insulation.
• Do not input voltage or current to the U INPUT terminals and
CLAMP SENSOR INPUT terminals when module power is OFF.
This will avoid damaging the module.