Fimer PVS980-58 - Control Cables and I;O Connections

Planning the electrical installation 63
 Example DC input power cable sizes
Always calculate the cable sizes according to the local rules and conditions,
for more information see DC cables on page 68.
As an example, DC cable size calculation is given below. It is based on the number of
inputs, the nominal input current (with even current distribution between the inputs), and
the current-carrying capacities and correction factors of IEC 60364. 90
°C cables, ground
cabling (installation method D2) and maximum temperature of 40
°C in the ground are
assumed (typically the conditions are not this severe). The cables must have sufficient
cooling distances, with a maximum of four cables touching each other. Different
assumptions can cause considerably different results.
1) The number of lead-throughs is the limiting factor
DC input cable sizes in the USA (according to NEC 2017)
As an example, DC cable size calculation is given below. It is based on the number of
inputs, the nominal input current (with even current distribution between the inputs), and
the current-carrying capacities and correction factors of NEC 2017. 90
°C cables, ground
cabling with less than 10% of the total length inside the inverter and a maximum
temperature of 40
°C in the ground are assumed (typically the conditions are not this
severe). The cables must have sufficient cooling distances, with a maximum of six cables
touching each other. Different assumptions can cause considerably different results.
Number of
inputs
Single cabling Dual cabling
Example cable size –
Cu
Example cable size –
Al
Example cable size –
Cu
Example cable size –
Al
8 240 mm
2
N/A 120 mm
2
185 mm
2
12 150 mm
2
240 mm
2
95 mm
2
120 mm
2
16 95 mm
2
185 mm
2
70 mm
2
95 mm
2
20 70 mm
2
120 mm
2
N/A
1)
N/A
1)
24 50 mm
2
95 mm
2
N/A
1)
N/A
1)
Number of
inputs
Single cabling Dual cabling
Example cable size –
Cu
Example cable size –
Al/copper clad Al
Example cable size –
Cu
Example cable size –
Al/copper clad Al
8 700 MCM 1250 MCM 300 MCM 400 MCM
12 350 MCM 500 MCM 2/0 AWG 4/0 AWG
16 300 MCM 400 MCM 1/0 AWG 3/0 AWG
20 4/0 AWG 300 MCM N/A N/A
24 2/0 AWG 4/0 AWG N/A N/A