Kaco blueplanet 1502xi Manuel d'utilisateur télécharger pdf (Page 24)

Page 26 blueplanet Operating and Installation Instructions 1502x - 2502x

Installation and Start-Up

nect, 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 elec-

tric system must be provided, and if the equipment is energized

from more than one source, the disconnecting means should be

grouped and identiﬁ ed. Allowances for several AC circuits to

be disconnected 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 expos-

ing the operator to live circuits, and plainly indicate the open

and closed positions. The disconnect shall have an interrupting

rating sufﬁ cient for the nominal circuit voltage and current that

is available at the line terminals of the equipment.

690.64: The supply side of the inverter shall be permitted 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.

230.82.6: The type of equipment connected to the supply is

listed, with subsection six identifying solar electric systems as

permissible.

All components within a UL 1741 compliant inverter must pass

evaluation spacing, voltages and currents that the inverter is

rated for. The UL 508 standard, industrial control equipment,

auxiliary devices has provisions for testing manually operated

switches. The integrated switch passed the UL508 standard

under the ﬁ le E304888 for use within a UL 1741 approved grid

tied inverter. The switch was tested 6000 operating cycles at

the nominal AC and DC voltages and currents as noted in table

one below. Additional operating cycles of 4000 resulted in a

total of 10000 successful operating cycles. The switch was de

constructed and evaluated under a pass fail criteria.

As referenced in the NEC, subsection 690.17, the switch must

meet applicable voltage and current ratings. The AC and DC

switch ratings are detailed in this table:

AC / DC

Disconnect

Inverter Models

1502 2502

DC Nominal

Voltage: VDC

550 550

DC Nominal

Current: IDC

21.45 21.45

AC Nominal

Voltage:

VAC

240/ 208 240/ 208

AC Nominal

Current:

IAC

812.5

5.3 External DC switch and AC

disconnect

NOTE

External DC switch

An external all-pole DC disconnect switch and an AC dis-

connect, 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 turn off the switch in the connection box, lock

it and measure the AC and DC wiring to be sure it

is not energized.

DANGER

If there is a ground fault in the PV array, the groun-

ded conductor 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

grounded and is live with respect to the position of

the ground fault.

Safety of components

The Authority Having Jurisdiction (AHJ) has a difﬁ cult charge

and maintains ultimate authority of the solar electric system’s

ﬁ nal inspection. The AHJ must be well versed with the require-

ments of the NEC, understand the local utilities’ ruling on the

use of a utility external disconnect switch (UEDS), and appli-

cable use of a UL 1741 approved product.

The following NEC 2008 subsections provide an overview of

the solar electric system disconnect requirements: 690.13;

690:14, 690.15, 690.17; 690.64, 230.82.6. Subsections are

summarized below. For the complete text refer to the appli-

cable NEC version approved for use in your jurisdiction.

690.13: The means to disconnect all current carrying conduc-

tors of a solar electric system from all other conductors in a

building.

690.14, sections A through D: Section A, the disconnection

means are not required to be suitable for service equipment and

should be rated in accordance with 690.17. Section B, equip-

ment speciﬁ c to the photovoltaic 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 discon-

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Kaco blueplanet 1502xi Manuel d'utilisateur Page 24

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