Outdoor Installation - Grundfos CRE Instrucciones De Instalación Y Operación

Fuses
Fuses used for motor protection must be rated for minimum
500 V.
Motors up to and including 10 hp require class K5 UL-listed fuses.
Any UL-listed fuse can be used for motors of 15 hp.
Branch circuit protection
When the pump is protected by a circuit breaker, this must be
rated for a maximum voltage of 480 V. The circuit breaker must
be of the "inverse time" type.
Overload protection
Degree of overload protection provided internally by the drive, in
percent of full-load current: 102 %.

1.5 Outdoor installation

According to UL 778/C22.2 No 108-14 pumps that are intended
for outdoor use shall be marked enclosure type 3 and the product
shall be tested with rated surface temperature down to -31 °F
(-35 °C). The MLE enclosure is approved for type 3 or 4 and rated
surface temperature down to 32 °F (0 °C), thus only for indoor
use in UL 778/C22.2 No 108-14 pump applications. For ambient
temperature during operation, see section 10.1.2 Ambient tempe-
rature.
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