I have a PV inverter that has two isolated input channels, each channel capable of accepting an 18A feed from a PV array. I want to feed each channel with two strings each capable of providing 7.5 ADC, or 15A max total into each input. Typically the wiring entering the inverter for each string will be #10AWG in order to minimize IR drop and improve system efficiency.
Essentially I want to know if it is legal (and reasonable) to splice two string feeds at the input terminal block of the inverter. The terminal block is a UL Recognized, 4-position, series C from Eagle Connector. It is rated at 600V, 85A, #4 -18 AWG wire range, and a 20 lb-in torque requirement (http://www.eagleconnector.com/cseries.html)
Per 110.14(A): Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads.
Not sure how to measure a 'thoroughly good connection' but I think this connector would meet this requirement
This section also goes on to say: Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.. Does this mean unless the UL report specifies the terminal can accept multiple conductors, it is a NO-GO?
The UL report for this terminal block does not mention capability of multiple conductors nor any stranding specs - but, it must accept multiple conductors, e.g., Class B #4 stranding is 7 x 0.0722" or approximately 7 strands of #14. Does this count for anything?
Finally, NEC 110.14(C)(2):Separate Connector Provisions. Separately installed pressure connectors shall be used with conductors at the ampacities not exceeding the ampacity at the listed and identified temperature rating of the connector. - I am at a loss to understand this section - anyone got a translation?
Essentially I want to know if it is legal (and reasonable) to splice two string feeds at the input terminal block of the inverter. The terminal block is a UL Recognized, 4-position, series C from Eagle Connector. It is rated at 600V, 85A, #4 -18 AWG wire range, and a 20 lb-in torque requirement (http://www.eagleconnector.com/cseries.html)
Per 110.14(A): Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads.
Not sure how to measure a 'thoroughly good connection' but I think this connector would meet this requirement
This section also goes on to say: Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.. Does this mean unless the UL report specifies the terminal can accept multiple conductors, it is a NO-GO?
The UL report for this terminal block does not mention capability of multiple conductors nor any stranding specs - but, it must accept multiple conductors, e.g., Class B #4 stranding is 7 x 0.0722" or approximately 7 strands of #14. Does this count for anything?
Finally, NEC 110.14(C)(2):Separate Connector Provisions. Separately installed pressure connectors shall be used with conductors at the ampacities not exceeding the ampacity at the listed and identified temperature rating of the connector. - I am at a loss to understand this section - anyone got a translation?
