Outdoor Installation - Grundfos CRE Notice D'installation Et De Fonctionnement

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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