SMA SC 500CP-US - Manual (Page 60)

10 DC Connection SMA America, LLC
60 SCCP-US-IA-US_en-41 Installation Manual
10.2 Requirements for the Cables and Cable Connection
10.2.1 Cable Requirements for the DC Connection
☐ All cables must be suitable for temperatures of up +197°F (+90°C) and in accordance with the National Electrical
Code
®
ANSI/NFPA 70.
☐ Use only copper cables or tin-plated aluminum cables.
☐ The wire size has to be based on the ampacities given in Table 310.16 of the National Electrical Code
®
, ANSI/
NFPA 70, and the derating factor of no less than 125 percent of the RMS or DC current that the circuit carries during
rated conditions.
10.2.2 Requirements for the Cable Connection with Terminal Lugs
☐ All used terminal lugs must have a valid UL approval.
☐ Cable lugs have to be UL listed compression lugs with two securement holes (
1
⁄
2
in. (13 mm) in diameter) and a
distance between the holes of 1 3 ⁄
4
in. (44 mm). Both holes have to be utilized in installation.
☐ The terminal lug width must be larger than the diameter of the washers (1
1
⁄
4
in. (32 mm)). This will ensure that the
specified torques are effective over the whole surface.
Danger to life from electric shock due to ground fault
If a ground fault has occurred, parts of the plant that are supposedly grounded may in fact be live. Touching incorrectly
grounded components can result in death or very serious injuries from electric shock.
• Ensure that no voltage is present before touching any components of the PV plant.
• Wear Hazard Risk Category 2 personal protective equipment for all work on the inverter.
Danger to life from electric shock when entering the PV field
The insulation monitoring device with GFDI and Advanced Remote GFDI does not provide protection from injury when
GFDI is activated. PV modules grounded by GFDI discharge voltage to ground. When entering the PV field, lethal
electric shocks may occur.
• Before entering the PV field, switch the PV array to insulated operation.
• Ensure that the insulation resistance of the PV array is greater than 1 k Ω .
Danger to life from electric shock if the inverter is damaged
Operating a damaged inverter can lead to hazardous situations that result in death or serious injuries due to electric
shock.
• Only use the inverter when it is technically faultless and in an operationally safe state.
• Regularly check the inverter for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.
• Wear Hazard Risk Category 2 personal protective equipment for all work on the inverter.
Danger to life from electric shock even if the inverter is disconnected on the AC and DC sides
The precharge unit of the option "Q at Night" is also live if the AC contactor and the DC switch are open. Touching live
components of this assembly will result in death or serious injury.
• Do not touch live components.
• Do not remove protective covers.
• Observe the warning messages.
• Wear personal protective equipment.
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