SMA SC 500CP-US - Manual (Page 72)

11 AC Connection SMA America, LLC
72 SCCP-US-IA-US_en-41 Installation Manual
11.2 Requirements for the Cables and Cable Connection
11.2.1 Cable Requirements for the AC 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.
11.2.2 Requirements for the Cable Connection with Terminal Lug
☐ 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.
☐ A maximum of six cables may be connected per line conductor.
☐ 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
4 AWG to 800 kcmil
(25 mm
2
to 405 mm
2
)
44.5 ft.-lbs. (60 Nm)
Tin-plated aluminum terminal lug on
copper bus bar
4 AWG to 800 kcmil
(25 mm
2
to 405 mm
2
)
27.5 ft.-lbs. (37 Nm)