Bronson++ MII-D Serie Manual De Instrucciones página 9

Bronson MII-D Series
Toroidal Core Isolation Transformer
Instruction Manual
2. Operation of the Isolation Transformer
Before using the isolation transformer make sure that the configuration of all connections correspond
to the selected application, note that for some applications it may be desirable to maintain the PE ground
on the Output Sockets across the primary and secondary sides of the transformer by switching the
ground connection switch to the ON position, in the following cases it will be desirable to switch this
OFF:
a. To protect from electric shock when operating or repairing AC devices
If this isolation transformer is used to protect from electric shock when operating or repairing AC
devices, make sure that the connected device will not be connected to the ground of the transformer.
If using the USA output sockets, switch the ground connection switch to OFF position.
b. To protect from electric shock when testing electrical devices with a
measuring device
If an isolation transformer is used in the testing of electrical equipment it is always the measured object
but not necessarily the measuring device (such as an oscilloscope) that has to be connected to an isolation
transformer. Make sure that the measured object will not be connected to the ground of the transformer.
If using the USA output sockets, switch the ground connection switch to the OFF position.
c. To avoid corrosion and protect from electric shock when using AC shore
power on a boat or ship
If this isolation transformer is used to connect a boat or ship to shore power, make sure that the secondary
circuit will not be connected to the ground of the transformer. If using the USA output sockets, switch the
ground connection switch to the OFF position. If the boat has a dedicated AC ground, this can be used and
the neutral and ground wires can be bridged at the secondary side of isolation transformer. Thus,
any leaking current will return to the transformer on the boat or ship, protecting everyone in the water.
It will furthermore prevent galvanic corrosion, which can occur if boats or ships in a marina or in a
harbor are connected through the ground connection of a shared power supply. Galvanic corrosion
affects the metal underwater parts, such as ship propellers or metal fittings, and it is prevented by isolating
the circuit on the boat or ship (secondary circuit) from the shore power (primary circuit). On the secondary
side of the isolation transformer it is recommended to use an RCD (residual current device), which
will interrupt the circuit in case of any current leakage causing unequal amount of current at L and N.
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