The VFD should be located indoors in an unclassified area with ambient temperature range of 50°F to 104°F. The VFD should have a minimum ingress protection of NEMA12 or IP21.
The VFD vendor should provide the minimum spacing required around the VFD essential to maintain proper ventilation and cooling, whether mounted alone in an enclosure, or as part of a multiple VFD installation within the same enclosure.
The VFD should be capable of withstanding the thermal and mechanical forces resulting from a short circuit.
An electrical by-pass should be provided. The by-pass should be manually operated and provided with mechanical interlocks to prevent paralleling of the VFD and by-pass power supplies.