SMA SC 500CP-US - Manual (Page 71)

SMA America, LLC 11 AC Connection
Installation Manual SCCP-US-IA-US_en-41 71
11 AC Connection
This section describes how to make the AC connection on the inverter and what safety measures must be taken in order
to avoid personal injury and property damage. It contains information on the cable requirements and the torque for
correctly connecting the cable.
The AC outputs are isolated from the enclosure and the system grounding, so that the AC output and neutral are not
bonded to ground. If required by section 250 of the National Electrical Code
®
, ANSI/NFPA 70, the installer is
responsible for this grounding.
11.1 Safety Precautions for the AC Connection
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Danger to life from electric shock due to live voltage
High voltages are present in the live components of the inverter. Touching live components results in death or serious
injury due to electric shock.
• When working in a high contact-risk environment, wear Hazard Risk Category 2 personal protective equipment.
• Do not touch live components.
• Follow the instructions precisely.
• Observe all safety messages on the product and in the documentation.
• Observe all safety precautions of the module manufacturer.
• Before any work on the inverter is performed, always disconnect the following components from voltage sources
if live voltage is not absolutely necessary:
– Power line voltage for grid feed-in
– Internal power supply
– DC voltage from the PV array
– Additional external voltages, e.g. control signals of a control room
• Ensure that no disconnected components can be reconnected.
• After disconnecting the inverter from voltage sources, wait at least 15 minutes for the capacitors of the inverter to
discharge completely.
• Always check that no voltage is present in any of the components before working on the inverter.
• Ground and short-circuit the device.
• Cover or safeguard any adjacent live components.
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Risk of fire due to failure to observe torque specifications on high-voltage bolted connections
Failure to follow the specified torques reduces the ampacity of the high-voltage bolted connections so that the contact
resistances increase. This can cause components to overheat and catch fire. This may result in death or serious injury.
• Ensure that high-voltage bolted connections are always executed with the exact torques specified in this document.
• Use suitable tools when working on the device.
• Avoid repeated tightening of high-voltage bolted connections, as this may result in inadmissibly high torques.
Fire hazard due to different cable lengths
Different cable lengths may cause the cables to overheat and catch fire. This may result in death or serious injury.
• The cables of the individual line conductors must be of the same length.