44
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
The 1000V
DC
Mersen HP10M PV fuse series are required as replacement
fuses when necessary. Detailed fuse information is available at
http://www.ep-us.mersen.com/.
The touch safe fuse holders and wirebox internal factory wiring are
designed to accept either 15A, 20A, 25A, or 30A rated fuses. The larger
rated fuses may be required for combined input strings; for example,
when Y branch connectors are used with DC field wiring to reduce PV
source circuit home runs. CPS allows replacement of the factory
installed 15A fuses with appropriate ampere ratings, however CPS does
not provide nor stock these fuses.
NOTICE:
When installing replacement 25A or 30A fuses, these fuses may not
be installed in adjacent fuse holders. An empty or unused fuse
holder must be positioned between each 25A/30A fuse within each
MPPT.
When Y branch connectors or harnesses are used with DC field
wiring to reduce PV source circuit home runs, the Y-Comb Terminal
Block may be used as an optional accessory. Refer to section 9.3
for further detailed information.
Use of fuses from other manufacturers or incorrectly sized fuses
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