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4000003077/00/02.2021
2 Safety
This section includes general safety instructions for han-
dling the PV AC combiner box. Specific warning notices for
specific tasks and situations are given at the appropriate
places in the documentation. Failure to observe the safety
and warning notices can result in damage to persons and
material.
2.1 General safety notice
Proper transport, storage, installation, commissioning, op-
eration and maintenance are required to ensure that the
products operate safely and without any problems.
The permissible ambient conditions must be observed.
Ensure protection against unauthorised opening. Unauthor-
ised persons must neither open nor operate the combiner
box.
Photovoltaic systems can generate hazardous voltages.
Two different ways of service activities are allowed on
these products:
–
"Working under voltage": Only electricians who have a
qualification for working under voltage are allowed to
carry out service activities under voltage. Observe the
local regulations and make use of appropriate personal
protective equipment.
–
"Working without voltage": Electricians and trained per
-
sons are allowed to carry out work without voltage, when
input and output connections are safely disconnected
and secured against re-connection. Observe the local
regulations and make use of appropriate personal pro
-
tective equipment.
Before connecting the cables to the input connectors,
make sure that the fuses are not inserted and that the open
circuit voltage of the corresponding string is equal to the
other strings.
Do not extract or insert fuses under load. Before manipu-
lating a fuse make sure there is no reverse current flowing
into the corresponding string.
If the installation regulations are violated, all warranty and
liability claims are void.
If a malfunction on a PV AC combiner box
cannot be fixed
after following the recommended measures, the product
in question must be sent back to Weidmüller. Weidmüller
does not assume any liability if the product has been tam-
pered with.
2.2 Intended use
The PV AC combiner box series are intended for use in
photovoltaic (PV) systems designed with string inverters.
The product combines various (2 to 6) string inverter out-
puts into typically one output. The product contains over-
current and overvoltage (optionally) protections at inverter
level. Energy metering devices are provided optionally in
order to monitor the electrical generation of the combiner
box output.
Weidmüller products may only be used for the applications
described in the catalogue and in the relevant technical
documentation.
The observance of the documentation is part of the intend-
ed use.
2.3 Personnel
Work on combiner boxes in the photovoltaic
field may only be performed by qualified elec
-
tricians with the support of trained persons. As
a result of their professional training and expe-
rience, an electrician is qualified to perform the
necessary work and identify any potential risks.
It is a common practise in the sector to apply the five safety
rules described in the standard EN 50110. Anyway, quali-
fied electricians must analyse case by case on each instal
-
lation the best way to proceed with safety.
The five safety rules are the following:
1. Disconnect completely
2. Secure against re-connection
3. Verify that the installation is dead
4. Carry our earthing and short-circuiting
5. Provide protection against adjacent live parts
2.4 Legal notice
PV AC combiner boxes are CE-compliant in accordance
with Directive 2014/35/EU (Low Voltage Directive) and with
Directive 2014/30/EU (EMC Directive).
