SMA SC 250U - Manual (Page 13)

SMA America, LLC 2 Safety
Installation Guide DISU_SCUS-IA-IUS111711 13
• It is prohibited to connect the Sunny Central 500HE-US/CA or Sunny Central CP without
transformer to the grid. Operating the inverter without transformer causes a short-circuit and can
destroy the inverter.
2.2 Safety instructions
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High voltages are present in the live components of the low-voltage grid.
Death from burning and electric shock will result.
• Do not touch the live components of the inverter or of the Disconnect Unit or low-voltage grid.
• Pay close attention to all safety precaution measures regarding the low-voltage grid.
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During operation, high voltages are present in the inverter and in the Disconnect Unit.
Death resulting from electric shock will result.
• If the Disconnect Unit has got doors: Do not operate the inverter and the Disconnect Unit with
doors open.
Before commencing work on the inverter and the Disconnect Unit:
• Disconnect completely.
• Ensure that the device cannot be reconnected.
• Ensure that no voltage is present.
• Ground and short-circuit.
• Cover any nearby live parts.
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Normally grounded conductors may be ungrounded and energized when a ground-fault is
indicated by the inverter.
Risk of electric shock.
• Test before touching.
• Work on the inverter and on the Disconnect Unit must be carried out by qualified personnel.