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WARNING: Electrical Hazard
If the power cable is jerked loose, then the ground (earth) conductor must be
the last conductor to come loose from its terminal. Make sure that the ground
(earth) conductor is longer than the phase conductors at both ends of the cable.
WARNING: Electrical Hazard
Risk of electrical shock or burn. You must connect an additional ground- (earth-)
fault protection device to the grounded (earthed) connectors if persons are likely
to come into contact with liquids that are also in contact with the pump or
pumped liquid.
Ground (earth) conductor length
The ground (earth) conductor must be 150 mm (6.0 in) longer than the phase
conductors in the junction box of the unit.
4.4.3 Product-specific precautions
Short-circuit protection
The short-circuit protection should be in accordance with the rated data shown
on the data plate. Use time-delay fuses rated 1.5 × the rated current for the
actual pump.
Pumps without built-in motor protection
The following requirements apply:
• The thermal overload circuit breaker/relay must conform to the rated current
and motor power input of the actual pump. The overload relay should be set
as follows:
Start option
Overload relay setting
DOL start
1.1 × the rated current (line current)
Y/D start
0.58 × the rated current (phase current)
• The pump must be equipped with an external motor starter with a protection
system. Use either of the following alternatives:
– On/off switch, thermal overload magnetic circuit breaker/relay, and
integrated thermal monitoring system (for connection of motor thermal
contacts circuit T1/T2)
– On/off switch and thermal overload circuit breaker/relay
Connection of the pump to a local power source
The following recommendations apply:
• Make sure that the local power source can start and run the actual pump. The
following maximum power kVA values for the generator are recommended:
Table 1: DOL start
Number of pumps driven by the
same generator
Recommended maximum power
kVA values for the generator, as a
multiple × the maximum power
consumption for one pump
1
3
2
4.5
4 Installation
16
8120.280 Sandy Inox Installation, Operation, and Maintenance Manual
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