Electrical Connection - S&P UTBS Série Instructions De Montage

6.6. ELECTRICAL CONNECTION

• Before putting the unit in place, make sure that the nominal supply voltage mat-
ches that listed on the unit's identification plate.
• It should be installed with cables whose cross-section meets current regulations
and prevents overheating and voltage drops that exceed permissible limits. Cu-
rrent regulations must be obeyed, and the designer's instructions must be fo-
llowed at all times.
• Before connecting the cables, make sure that the electricity is turned off and that
there is no voltage present in any of them.
• The installer must keep the following points in mind when performing the electri-
cal connections:
- An external control must be installed that operates the equipment.
- An emergency shut-off switch must be installed in the most accessible
place in order to stop the equipment in the event of a problem.
- The motors must be connected following the instructions in the wiring
schematics for the terminal boxes for the various motors. The equipment
has glands on the sides where the power is connected for running power
cables to the motors.
- A power outlet, fuse or "U" curve thermo-magnetic breaker must be insta-
lled for each fan, which will protect each power line in the even of a short
circuit.
- The general power line must have a fuse or "U" curve thermo-magnetic
breaker that will protect the mains power in the event of a short circuit.
- Interlocked contactors with a thermal relay are recommended for use to
protect against over-current.
• The instructions in current regulations regarding the protection of electrical lines
against defects and direct and indirect contact must be obeyed at all times.
• After these steps are performed, check to make sure all electrical connections
are secure (loose wiring connections can cause irreparable damage).
• Check to make sure the electrical resistance between earth and any electrical
terminal is greater than 1 megohms. If it is not, do not start up the unit until the
electrical short has been located and repaired.
• As a safety measure, if there is no power to the fan, the necessary interlocks must
be performed so that all other electrical components are also de-energised.
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