INSTRUCTION:
The CPS SCA36/50/60KTL-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 SCA36/50/60KTL-DO/US-480 inverter Standard and 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
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