Drain Holes; Electrical Installation; Cable Requirements - Grundfos CRE Instrucciones De Instalación Y Operación

The cover must be sufficiently large to ensure that the motor is
not exposed to direct sunlight, rain or snow. Grundfos does not
supply covers. We therefore recommend that you have a cover
built for the specific application. In areas with high humidity, we
recommend that you enable the built-in standstill heating
function. See section 7.21 "Standstill
Fig. 2 Examples of covers (not supplied by Grundfos)
In order to maintain the UL mark, additional
requirements apply to the equipment. See Appendix,
page 196.

4.1.7 Drain holes

When the motor is installed in moist surroundings or areas with
high humidity, the bottom drain hole must be open. The enclosure
class of the motor will then be lower. This helps prevent
condensation in the motor as the motor becomes self-venting,
and it allows water and humid air to escape.
The motor has a plugged drain hole on the drive side. You can
turn the flange 90 ° to both sides or 180 °.
B3 B14
Fig. 3 Drain holes

4.2 Electrical installation

DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply to the motor and to the
signal relays. Wait at least 5 minutes before you
make any connections in the terminal box. Make
sure that the power supply cannot be accidentally
switched on.
DANGER
Electric shock
Death or serious personal injury
- Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
If the power supply cable is damaged, it must be replaced by the
manufacturer, the manufacturer's service partner or a similarly
qualified person.
The user or the installer is responsible for the installation of
correct grounding and protection according to local regulations.
All operations must be carried out by a qualified electrician.
8
heating", page 52.
B5
4.2.1 Protection against electric shock, indirect contact
WARNING
Electric shock
- Death or serious personal injury
- Connect the motor to a protective ground and
provide protection against indirect contact in
accordance with local regulations.
Protective-ground conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) color marking.
Protection against power supply voltage transients
The motor is protected against power supply voltage transients in
accordance with EN 61800-3.
Motor protection
The motor requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking.

4.2.2 Cable requirements

Cable cross-section
DANGER
Electric shock
Death or serious personal injury
- Always comply with local regulations as to cable
cross-sections.
Single-phase supply
Conductor
Conductor type
material
Solid
Copper
Stranded
Three-phase supply
Conductor
Conductor type
material
Solid
Copper
Stranded
Conductors
Type
Stranded or solid copper conductors.
Temperature rating
Temperature rating for conductor insulation: 140 °F (60 °C).
Temperature rating for outer cable sheath: 167 °F (75 °C).
Cross section
2
[mm ] [AWG]
0.5 - 2.5 28-12
0.5 - 2.5 30-12
Cross section
2
[mm ] [AWG]
0.5 - 10 18-8
0.5 - 10 18-8