KACO blueplanet 1502x - Manual (Page 12)

Page 12 blueplanet Installation Instructions 1502x - 5002x
5.3 External DC switch and AC disconnect
Intended use
NOTE
External DC switch
An external all-pole DC disconnect switch and an
AC disconnect, which allows for the inverter to be
disconnected from the photovoltaic generator and
the AC power grid and removed for service.
!
DANGER
When replacing the inverter section, the installer must measu-
re the AC and DC wiring to be sure it is not energized.
! DANGER
If there is a ground fault in the PV array, the grounded con-
ductor may be live. This is a problem with the requirements of
the National Electric Code requiring that only the ungrounded
conductor be switched. If a ground fault is present and the
GFDI fuse blows, the grounded conductor is no longer groun-
ded and is live with respect to the position of the ground fault.
Section 5 · Installation and Start-Up
Safety of components
The Authority Having Jurisdiction (AHJ) has a difficult
charge and maintains ultimate authority of the solar
electric system’s final inspection. The AHJ must be well
versed with the requirements of the NEC, understand
the local utilities’ ruling on the use of a utility external
disconnect switch (UEDS), and applicable use of a UL
1741 approved product.
The following NEC 2008 subsections provide an over-
view of the solar electric system disconnect require-
ments: 690.13; 690:14, 690.15, 690.17; 690.64, 230.82.6.
Subsections are summarized below. For the complete
text refer to the applicable NEC version approved for
use in your jurisdiction.
690.13: The means to disconnect all current carrying
conductors of a solar electric system from all other
conductors in a building.
690.14, sections A through D: Section A, the disconnec-
tion means are not required to be suitable for service
equipment and should be rated in accordance with
690.17. Section B, equipment specific to the photovol-
taic source circuits such as over current devices, circuit
isolation switches, and blocking diodes are permitted
on the solar electric side of the disconnection means.
Section C, the disconnection means should be located
in a readily accessible location, preferably near the
points of building entrance, be marked as a solar electric
system disconnect, suitable for use for the prevailing
conditions, and limits the grouping of disconnects to
six per enclosure. Section D, permits utility interactive,
or grid tied inverters to be located in areas that are not
readily accessible, and details the switch requirements.
The AC and DC disconnect should be line of sight with
the inverter and be readily accessible.
690.15: The means for disconnecting all aspects of
a solar electric system must be provided, and if the
equipment is energized from more than one source,
the disconnecting means should be grouped and iden-
tified. Allowances for several AC circuits to be discon-
nected is allowed as long as the disconnect complies
with 690.17
690.17: The means for disconnect all ungrounded
conductors should be readily accessible, externally
operable with exposing the operator to live circuits,
and plainly indicate the open and closed positions. The
disconnect shall have an interrupting rating sufficient
for the nominal circuit voltage and current that is avail-
able at the line terminals of the equipment.
690.64: The supply side of the inverter shall be permit-
ted to be connected to the supply side of the service
disconnecting means as permitted in 230.82.6. The
load side is permitted as long as each interconnection
is made with a dedicated circuit breaker rated for the
appropriate current back feed rating.