5.2.7 Electric wiring
DANGER
Unqualified personnel connecting extension leads
Installation in a well - electric shock!
▷ The extension lead must be connected by a professional electrician only.
▷ The cable ends must be dry and clean.
DANGER
Earth conductor not properly connected
Danger of death from electric shock!
▷ Never operate the motor without earth conductor.
▷ The earth conductor must be connected by a professional electrician only.
NOTE
The motor lead is selected for submerged operation and must be completely
submerged, including the cable connector.
See order documentation for any other use!
Submersible motors are supplied fitted with a motor lead. The motor lead has been
extended with a suitably sized extension cable to meet the length required for the
specific installation. Unless otherwise indicated, the motor lead is designed for
submerged operation only. To meet this condition the cable connector also has to be
completely submerged.
Extension cables connected by KSB
If agreed with KSB, the extension cable can be supplied connected to the motor lead
with a watertight cable connector.
▪ Unless otherwise specified in the order documentation, KSB's extension cables
are designed for:
–
Being laid in free air
– A voltage drop along the lead of ᅀ U ≦3 %
For any other ways of laying cables, e.g. in cable ducts, etc. observe the
information on the maximum current-carrying capacity as per the applicable
directives.
Extension cables connected by the operator
If the supplied extension cable is to be connected at the site, observe the following
points:
1. Observe the installation instructions of the cable connector to be used.
2. If the operator is responsible for connecting an extension cable, make sure the
extension cable is selected and dimensioned for a maximum voltage drop of ≦3
%. The extension cable has to be approved for the applicable operating
conditions.
3. In 4-core leads the earth conductor is part of the power cable and must also be
connected in the cable connector when connecting an extension cable.
4. 3-core motor leads do not include an earth conductor. A separate earth
conductor is connected on the outside of the motor. The earth conductor has to
be extended separately.
If no earth conductor is provided, the operator shall be responsible for earthing
the motor externally. (Core size corresponding to phase conductor, min. 4 mm
2
)
5. Connect the shield of shielded extension cables to the earth conductor. 3-core
motor leads as described in paragraph 4 must be earthed externally; connect the
shield of the extension cable to the earth conductor.
5 Installation at Site
26 of 64
UPA, UPZ, BSX
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