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It is worth noting that for this example we calculated the minimum series fuse rating. However, it
may be appropriate to use the supplied 15 A fuses insofar as they do not exceed the maximum se-
ries fuse rating (provided by the module manufacturer) or the overcurrent protection requirements
of your PV source wires. Please reference the appropriate NEC Article(s) for further discussion
regarding proper sizing of overcurrent protection
4.8.5.1.2
Generic fuse properties
Other fuse manufacturers may have compatible fuse types. The generic properties are:
•
Fast-acting
•
Dimensions: 1 1/2" in length x 13/32" fuse diameter
•
Interrupt Rating: >= 10 kA @ 600 Vdc
•
UL and CSA approval of the fuse is mandatory
•
String fuses can be sized from 1 A to max. 20 A and rated for 600 Vdc. Please see above
sec. 4.9.8.1.1 for calculating string fuse size.
4.8.5.2
String fuse replacement
WARNING!
AVERTISSEMENT!
DANGER!
DANGER!
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3
Figure 31: String fuse replacement procedure
34
Ensure no live voltages are present on PV input and AC output
circuits, and verify that the DC disconnect, AC disconnect, and de-
dicated AC branch circuit breaker are in the "OFF" position, before
inverter installation.
PV solar arrays produce hazardous voltages and currents when
exposed to light which can create an electrical shock hazard. Using
dark opaque sheets, cover the PV solar array before wiring or
connecting cable terminations.
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4
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