Installation above 1000 m amsl

The devices can be used at altitudes above 1000 m above sea level up to 3800 m above sea level under the following marginal conditions. The maximum altitude is limited due to the decreased dielectric strength at lower air density.

• The nominal motor current I_N is reduced due to the reduced cooling above 1000 m (see product manual > chapter "Technical data").
• Above 2000 m above sea level, the air and creepage distances are only sufficient for overvoltage category II. If the installation requires overvoltage category III, you will have to install additional external overvoltage protection to limit overvoltage peaks to 1.5 kV phase-to-phase and 2.5 kV phase-to-ground.
• If safe protective separation is required, then this must be implemented outside the device at heights of 2000 m above sea level or greater (safe electrical separation as per EN 61800-5-1).
• At installation altitudes between 2000 and 3800 m above sea level, measures must be taken that reduce the line side overvoltage from category III to category II for the entire system.