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INSTRUCTION:
The SCA50KTL-DO/US-480 and SCA60KTL-DO/US-480 3-
Phase Inverters are designed operate with ungrounded
arrays, although the PV system requires a DC EGC
(equipment grounding conductor) to ensure operational
safety. The grounding busbars are electrically bonded by way
of the inverter chassis.
3.3.3.2 DC Fuse Configuration/Selection
The CPS SCA50KTL-DO/US-480 and SCA60KTL-DO/US-480 inverter
Standard wire boxes and the RSD wire boxes include touch safe fuse
holders and preinstalled 20A DC fuses as factory standard. Ensure that
the appropriate fuse values are used depending on the configuration of
the PV array and by performing PV fuse sizing calculations for each string.
1. Each DC input conductor for the PV string requires fuse protection.
(2014 NEC and earlier editions)
2. The voltage rating of the fuse must be at least 1000V
DC
.
3. The ampere rating of the fuse is generally selected as 1.56 ×
module Isc of the PV string. Refer to NEC 690.8 for Circuit Sizing
and Current requirements.
Table 3-6 DC Fuse selection
50/60KTL
Manufacturer 15A 20A 25A 30A
Mersen
Bussmann
Sinofuse
RS308-PV-
RS308-PV-
N/A N/A
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