Eaton PV240 - Page 38

Eaton Corporation Page 38 Ver 1.1
H. DC Input Terminal Block
It is the terminal block that used to connect the DC cables from the PV
modules. In order to have a trouble free connection, it is recommended to
connect PV modules of the same type, same quantity, with an identical
configuration of strings.
However, the size selection of DC cables should be refer with cable
size requirement in the National Electrical Code(NEC), ANSI/NFPA 70
in order to select the proper size of DC cables can be used with the PV
inverter.
I. Protection MOV for AC Output Side
It is the surge protection that is used to protect the output circuit against
excessive voltage of the AC connections.
J. AC Output Terminal Block
It is the terminal block that is used to connect AC cables from the utility
system, also known as the public grid. Each model of the Eaton grid-tied
PV Inverter requires different sizes of AC cables. The following table
indicated required cable size and tightening torque for position (1) pole /
position (2) pole / position (3) pole in the AC terminal block when a 208V
grid system applied with the PV inverter:
Model
Terminal block
PV240
(PV238)
PV250 PV260 PV270
Terminal block
labeled with (1),
(2), (3)
Admissible
conductor size
10 AWG 8 AWG 6 AWG
90
o
C / 194
o
F, Copper
Torque 15.6 lbf-in (18 Kgf-cm) 33.1 lbf-in (38.1 Kgf-cm)
Terminal block
labeled with (G)
Admissible
conductor size
10AWG
Torque 15.6 lbf-in (18 Kgf-cm)
33.1 lbf-in (38.1 Kgf-cm)
IMPORTANT
The selection for the AC cable size for the Position 1 / Position 2 /
Position 3 were referring with the table 310.16 from the National
Electrical Code (NEC).