INSTALLATION | Cabling and fusing
Doc #OI0003 Part #004122 Rev19 2014
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AC Wiring
WARNING: Copper wiring must be used through out..
The SP PRO does NOT contain internal circuit breakers of fuses. The AC wiring MUST be fitted with
appropriate fusing or circuit breakers.
The AC cabling should be sized according to maximum demand through (consumed by the AC Load)
and simultaneously consumed by the SP PRO (consumed by the charging of batteries). The SP PRO is
fitted with terminals which are suitable for accepting up to 35 mm
2
(50 mm
2
for SPLC models) cables. The
SP PRO is rated to 63 A (125A for SPLC models) current capacity and must be protected externally with
circuit protection device(s) of no greater than this.
AC wiring should be fed up through the appropriate gland and terminated to the SP PRO.
Connect the AC load wiring to the SP PRO: earth stripped back according to the table below. Connect the
AC source wiring to the SP PRO: earth to the AC Source earth terminal, neutral and active to the AC Source
terminals.
Multiple Hazardous Energy Sources
AC wiring is fed from multiple sources.
Care must be taken to ensure that under no
circumstances can the user access or touch wiring even after opening all circuit breakers.
Earth Wiring
The inverter shall be earthed to the installations Earth system. A minimum copper earthing conductor
not less than the table below, shall be used. See the local regulations for further information on earthing
conductor size.
Earth the inverter by connecting earth wiring from the switchboard to the inverter Earth terminal. The
SP PRO is suitable for Multiple Earth Neutral systems.
Cable and CB sizing for AC wiring - SP PRO
SPMC240 SPMC241
SPMC481
SPMC482
SPMC1201
SPLC1200,
SPLC1202
Maximum AC CB rating
63A
63A
63A
63A
63A
125A
AC Terminal size
35 mm
2
35 mm
2
35 mm
2
35 mm
2
35 mm
2
50 mm
2
Strip length for AC
terminals A and N
18mm
18mm
2
18mm
18mm
18mm
18mm
Strip length for Earth
terminal
12mm
12mm
12mm
12mm
12mm
16mm
Min. Earth cable size
6 mm
2
6 mm
2
6 mm
2
6 mm
2
6 mm
2
16 mm
2
Residual Current Device (RCD) Type Recommendation
The SP PRO produces a low distortion sine wave output via 50/60 Hz isolation transformer. This topology
ensures that the output is sinusoidal and that their is no DC component associated with the SP PRO AC
supply, whether that be feeding a domestic load or exporting solar to the grid. Standard Type AC RCDs are
suitable for use with an SP PRO. Other types of RCDs may also be used with the SP PRO.
