SMA SC 250U Installation - Manual (Page 10)

Safety SMA America, LLC
10 SC250U_GFDI-IUS101711 Installation Guide
2 Safety
DANGER!
During operation, high voltages are present in the Sunny Central.
Death from electric shock will result.
When working on the Sunny Central, the device must be disconnected form the power
supply and tested for absence of voltage. Be sure to observe the five safety rules for
working on electrical systems.
The five safety rules for working on electrical systems are listed below:
• Switch off the system.
• Ensure that the device cannot be reconnected.
• Wait at least 5 minutes for all internal power supplies to discharge.
• Test for absence of voltage.
• Ground and short-circuit.
• Prevent access to neighboring systems.
CAUTION
Danger of crushing results from falling components.
• Wear personal protective equipment while working on the Sunny Central.