SolarCity H6 - 3.8 Fireman Switch and Rapid Shutdown

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H6 Hybrid Inverter - Installation & Operation Guide

3.8 - Fireman Switch and Rapid Shutdown

NEC 690.12 specifies the requirements for a rapid shutdown function that allows the PV

system to be shut down in the event of an emergency in order to prevent shock hazards to

responders and other persons.

3.8.1 - Components

The Rapid Shutdown System (RSS) consists of the following components:

• RSS Box: This is small UL-listed box that is installed on the roof under the PV panel. This

box contains a disconnect that receives signals sent from the PLC Transmitter inside the

SolarCity H6 inverter via the PV power cables. See

“Rapid Shutdown (RSD)” on page 70

and

“SMART Rapid Shutdown Slave” on page 127

• PLC Transmitter: This is a small box or PCB with integrated circuit that is installed inside

the SolarCity H6 inverter Wiring Box. This box communicates with the RSS box(es) using

signals sent via the PV power cables. This part is UL-listed as part of the inverter

assembly.

• Fireman Switch: This is an emergency switch that is closed during normal operation.

Activating this switch initiates the rapid shutdown sequence. See

“Fireman Switch” on

page 71

• DC Disconnect Switch: This six-pole switch in the inverter disconnects both the PV array

and battery pack power cables from the internal inverter voltages. See

“DC Disconnect

Switch” on page 25

. This switch also has an auxiliary contact to detect its position.

• Battery Pack Switch: This is a small switch located on the right side of the battery pack

with clearly-indicated ON/OFF positions. Before any commissioning or maintenance

work, this switch must be in the OFF position.

Note: See the battery pack Owner’s Manual for the location of the battery

pack ON/OFF switch.