TECHNICAL NOTE - TOPIC JMTHY JMS-F: Alternative Mounting Method

STATEMENT REGARDING GROUNDING
The grounding/bonding evaluation for the JMS-F was completed as part of the UL1741 certication.
The metal arms on the mounting bracket contain “teeth” which cut into the anodization layer of the
solar PV module frame when a compression force is applied using the alternative mounting instructions
described above. These “teeth” create the grounding bond between the JMS-F device and the solar
PV module frame according to NEC Article 690.43.
All solar PV module frames with JMS-F devices attached must be properly grounded in accordance
with current National Electrical Code (NEC), or other required local, regional, or international
regulations. A solar PV module with exposed conductive parts is considered to be in compliance with
UL 1703 only when it is electrically grounded in accordance with the manufacturer’s instructions and
the requirements of the National Electrical Code.
Any grounding system/method, which is designed in accordance with relevant international and local
standards and regulations, such as UL2703, UL1703, UL467, NEC Articles 250 and 690.43, etc. can
be used for solar PV modules with JMS-F devices attached as long as the system is installed according
to the manufacturer’s instructions.
Proper grounding is achieved by bonding the solar PV module frame(s) and all metallic structural
members together continuously using a suitable grounding conductor, NEC listed grounding device,
or racking system that can be used for integrated grounding. For an adequate ground, the grounding
hardware should penetrate any anodized layer. The grounding conductor must eventually make a
connection to earth using a suitable earth ground electrode.
ADDITIONAL ASSISTANCE
For additional assistance in completing any of the instructions described above, contact SMA Service
Line at 1-877- 697-6283.