SMA SC 500CP-US - Manual (Page 56)

9 Grounding Connection SMA America, LLC
56 SCCP-US-IA-US_en-41 Installation Manual
9 Grounding Connection
In this section, you will learn how to connect the grounding cables in the connection area.
The grounding busbar is used to connect the equipment ground conductors and the grounding electrode conductor.
9.1 Requirements for the Cables and Cable Connection
9.1.1 Cable Requirements for the Grounding 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 cable cross-sections of the PE connections depend on the installed overcurrent protective device. Refer to the
National Electrical Code
®
ANSI/NFPA 70 Article 250.122 for how to calculate the required cross-sections.
☐ The grounding of the PV plant must be designed in accordance with the requirements of sections 690.41 to 690.47
of the National Electrical Code ® ANSI/NFPA 70 and is the responsibility of the installer.
9.1.2 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.
☐ Use only copper terminal lugs or tin-plated aluminum lugs.
☐ Connect a maximum of two grounding cables to the grounding connection lug.
☐ Only use screws, nuts and washers included in the scope of delivery.
☐ The specified torques must always be complied with.
Information on torques
The torques specified in the following table are the torques with which the terminal lugs are mounted to the copper
bus bar.
Connection option Cable cross-section Torque
Copper terminal lug on copper bus
bar
6 AWG to 350 kcmil
(16mm
2 to 185 mm 2 )
44.5 ft.-lbs. (60 Nm)
Tin-plated aluminum terminal lug on
copper bus bar
6 AWG to 350 kcmil
(16mm
2
to 185 mm
2
)
27.5 ft.-lbs. (37 Nm)