
17
INSTALLATION GUIDEMAINTENANCE, INSTALLATION & COMMISSIONING OF HX³/VX³ IS ENCLOSURES
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PRECOMMISSIONING OPERATIONS
After carrying out the operations described in the previous chapters and before switching on the panel, a series of verifications
must be carried out to eliminate any dangerous situations possibly caused by transport (loosening of the clamps, possible presence
of foreign bodies or conductive dust).
To do this, remove the front and side panels of the panel. During these operations, take care to ensure that there are equipotential
connections between the panels and the structure.
In general, take into account the following indications:
• Legrand faceplates are equipped with an automatic grounding system, using copper caps welded to the faceplates which, when
the faceplates are tightened, guarantee equipotentiality with the frame by pressure,
• in some particular cases (for example in the case of panels constituting the supporting structure of electrical equipment), it
is possible that another connection is present via a yellow-green cable: if the panel is fixed (without hinges), it is necessary to
disconnect this cable before completely removing the panel.
The following control operations must be carried out on the electrical panel before switching it on:
• general visual control:
- ensure that there are no foreign objects,
- ensure that there is no damage caused by transport,
• general cleaning, to be carried out carefully at the level of the insulating parts with clean and dry cloths,
• check that all connections are tight,
• checking the tightness and continuity of the protection circuit,
• carry out some control operations on each device (except on devices equipped with a undervoltage release:
- DX³: opening / closing cycle,
- DPX³: opening / closing cycle, closing cycle / test (red button) / reset,
- DMX³: loading cycle springs / closing / opening,
- DPX³ & DMX³ plugged-in / drawn-out: in addition to the checks indicated above, carry out a few extraction / reintroduction
cycles and make sure that the extraction of the device causes it to be released if it is in the closed position (except for DPX³
160/250: mechanical locking),
- Transfer switches: check the operation of mechanical interlocking devices according to the truth tables,
• check the connection of the auxiliary and measuring circuits,
• check the insulation resistance value between the three phases and between these phases and ground using a megohmmeter:
according to the IEC 61439-2 standard, the measurement must be carried out at a voltage of not less than 500 V, the insulation
resistance must be greater than 1000 ohm for each volt of voltage to ground (e.g. TT or TN systems at a nominal voltage of
400/230 V, the insulation resistance must be greater than 1000 x 230 = 230 000 ohm = 0.230 Mohm).
At the end of the control operations, put the devices in the «Open» position, including those in the tripped position. If the dielectric
test selector is present on the device, position it in «Test» mode.
PRECOMMISSIONING
OPERATIONS
(under the installer’s responsability)