Huawei SUN2000-25KTL-US Quick Installation Manual page 18

7
FAQ
7.1
Why the DC Switch Is Designed with a Hole?
The DC switch is designed with a hole for safety purposes. When maintenance needs to be
performed on the inverter, the DC switch must be turned off. To prevent misoperations of turning on
the DC switch, the switch must be locked. The design with a hole enables the DC switch to be locked.
What Is the Purpose of Measuring the Temperatures at the Joints
7.2
Between DC terminals and Connectors Using a Point-Test
Thermometer?
After the inverter has been running for a period, use a point-test thermometer to measure the
temperatures at the joints between DC terminals and connectors to check that the DC terminals
are in good contact.
Appendix: Power Grid Code Mapping Table
No. Power Grid Standard Code
1 IEEE 1547-MV480
2 IEEE 1547a-MV480
3 PRC_024_ERCOT-MV480
4 PRC_024_Eastern-MV480
5 PRC_024_Western-MV480
6 PRC_024_Quebec-MV480
7 ELEC RULE NO.21-MV480
8 HECO-MV480
NOTE
The grid codes are subject to change and are for your reference only.
For more information, refer to the channels provided on the following page.
Country and Condition
US medium-voltage power grid
2016 US medium-voltage power grid
Texas medium-voltage power grid
Eastern US medium-voltage power grid
Western US medium-voltage power grid
Quebec medium-voltage power grid
California medium-voltage power grid
Hawaii medium-voltage power grid
17