Degrees Of Protection - ABB Johnson Controls AYK550-UH User Manual

A 550-UH User's Manual

Degrees of protection

Available enclosures:
• UL type 1 (NEMA 1 / IP 21) enclosure. The site must be free of airborne dust,
corrosive gases or liquids, and conductive contaminants such as condensation,
carbon dust, and metallic particles.
• UL type 12 (NEMA 12 / IP 54) enclosure. This enclosure provides protection from
airborne dust and light sprays or splashing water from all directions.
Compared to the UL type 1 enclosure, the UL type 12 enclosure has:
• The same internal plastic shell as the UL type 1 enclosure
• A different outer plastic cover
• An additional internal fan to improve cooling
• Larger dimensions
• The same rating (does not require a derating).
Plenum Rating: A
with the requirements of UL508, meets all of the requirements for plenum rated
drives, and is "Suitable for Installation in a Compartment Handling Conditioned Air".
550 drives (UL type 1 & 12) have been evaluated in accordance
1-327
Technical data