ET Solar ET-P660250AC, Руководство по установке

Страница: 9 / 35

www.etsolar.com
7
Grounding in the AC Cables
The AC cable attached to the microinverter and all accessory cables are fully insulated and
contain an equipment grounding conductor (EGC). The full ground path from the transition
cable to the module frame follows:
• The transition cable's green conductor is connected to the EGC from the utility dedicated
branch circuit.
• All connectors have green ground contacts that are longer than the circuit contacts. This
extra length ensures the ground is the first to make contact when connecting modules
and the last to break contact when disconnecting modules.
• The AC ground wire inside the microinverter makes a bolted termination to the
microinverter chassis and is environmentally sealed.
• The microinverter chassis is bonded at the factory to the module frame with stainless
steel hardware to provide ground continuity to the AC PV module frame.
The AC cable grounding path has been tested by a NRTL. Before an AC module assembly can
be labeled with the NRTL certification mark and shipped from an authorized and inspected
factory, each assembly must pass a ground continuity check to verify electrical continuity from
the AC cable ground contact to the module frame.
The AC cable provides equipment grounding for the AC module only. It is the installer's
responsibility to ensure that any metallic parts in contact with the module (i.e. mounting
systems) are provided with a means of equipment grounding according to the manufacturer’s
instructions and local code.
Because the DC power is internal to the module, a grounding electrode conductor (GEC) is not
required.
Because the AC modules are connected in a “daisy chain” fashion, disconnecting one module
from within the string removes power and ground from subsequent modules in the string.
Extreme care should be taken to ensure that no other energized sources are adjacent to these
ungrounded modules, or auxiliary grounding methods must be provided.
If a module is removed from within the string, it is recommended that you bridge
the gap in the string using an AC extension cable. Inserting an extension cable
maintains ground continuity to subsequent modules in the string. See "AC Wiring
Accessories" on page 27 for a list of available extension cables. Other auxiliary
grounding methods may be used.