Grundfos NBE Series - Cable Requirements and Additional Protection

• TN-S earthing system
• TN-C earthing system
• TN-C-S earthing system
• TT earthing system
5.2 Protection against electric shock, indirect contact
WARNING
Electric shock
Death or serious personal injury
‐ Connect the product to protective earth and provide
protection against indirect contact in accordance with
local regulations.
Protective-earth conductors must have a yellow and green (PE) or
yellow, green and blue (PEN) colour marking.
5.3 Cover for the power cables
Model K is equipped with a cover for the power cables.
The cover is attached to the insulation cover with 2 screws (2) and
is equipped with 3 voltage measuring holes (1) for the respective
phases (L1, L2, L3).
1
2
PE
L2
L1
L3
TM084098
The cover for the power cables must be installed before
switching on the product.
5.4 Protection against mains voltage transients
The product is protected against mains voltage transients in
accordance with EN 61800-3.
5.5 Motor protection
The product incorporates thermal protection against slow
overloading and blocking. No external motor protection is required.
Model J: The product includes load and speed sensitive motor
overload protection.
Model K: The product includes load and speed sensitive motor
overload protection with thermal memory retention.
5.6
Connecting an external switch
We recommend that you connect the product to an external switch.
1. Connect the switch via terminals 2 (DI1) and 6 (GND).
A jumper is added from factory.
2. Enable the External stop function.
Default setting from factory.
5.7
Cable requirements
5.7.1 Cable cross-section
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply to the product including
the power supply for the signal relays. Wait at least 5
minutes before you make any connections in the
terminal box.
‐ Follow the wiring diagrams and local regulations.
‐ Use branch-circuit protection fuses.
‐ Comply with local regulations as to cable cross-
sections.
‐ Use the recommended fuse size.
‐ Connect the cables to terminals by applying the
recommended tightening torque.
WARNING
Fire hazard
Death or serious personal injury
‐ Comply with local regulations as to cable cross-
sections.
‐ Use the recommended fuse size.
‐ Connect the cables to terminals by applying the
recommended tightening torque.
Make sure that the cables are secured with cable glands
providing strain relief.
Recommended cable type for Model K: H07RN-F.
11
English (US)