LG A005KEEN261, Руководство пользователя

Страница: 21 / 74

Installation
21
Install
ation
2
AC circuit breaker requirements
A dedicated circuit breaker in the building panelboard is required for each LG Electronics ESS
inverter that is installed. There should be a circuit breaker or fuse to protect each AC line, L1 and
L2. The circuit breaker should be able to handle the rated maximum output voltage and current
of the inverter. Please refer to the table below to determine the appropriate circuit breaker size
to avoid potential fire hazards. The National Electrical Code (NEC), ANSI/NFPA 70 or applicable
local electrical codes must be followed when determining maximum branch-circuit over-current
protection requirements.
Recommended AC branch protection : 2-pole, 40 A 240 V AC
Please note that there is an exception to the requirement of a dedicated circuit breaker in the
building panelboard for each inverter if there exists a dedicated PV system AC sub-panel that
is used to combine multiple inverters. In this case, only one breaker at the main building service
panelboard should be installed for a multiple inverter installation utilizing a dedicated PV system AC
sub-panel.
Grounding electrode conductor (GEC)
Per NEC 690.47, a Grounding Electrode Conductor must be installed, and the GEC conductor must
be sized in accordance with NEC article 250.166. The GEC conductor should be terminated at the
GEC screw terminal inside the wiring box compartment.
Lightning and surge protection
LG Electronics ESS inverters are designed and certified to meet stringent UL1741 / IEEE 1547
and ANSI/ IEEE 62.41/62.42 AC lighting and surge requirements; however, every PV installation is
unique, thus additional external UL/NEC AC and DC surge protection and solid grounding practice is
recommended.