How long can I extend DC cable of the power supply?

Owing to line (voltage)-drop, we suggest the extension made from AC cable. In case DC cable extension is necessary, please consider Line-Drop leading to insufficient Vf so that the application may fail to switch ON. Moreover, EMC performance and characteristic may also be affected by DC cable extension.

Shenzhenshi Zhenhuan Electronic Co.,Ltd (www.szzhpower.com) was founded in 2008, specialize in external power adaptor, ac dc adapter, Outdoor Waterproof Power Supply, led driver, Power Transformer, switching power supply, dimmable or non-dimmable LED Drivers and Battery Charger in Shenzhen, China. 

Zhenhuan is one high quality power supply manufacturer, we also have own brand  KSPOWER, and our products of power range from output 4.2W to 384W (output voltage 4.2V to 48V, output current 0.2A to 20A) a total of 1000 kinds of models and come with safety regulation standards: IEC/EN 62368, IEC/EN 61558, IEC/EN 61347, UL/cUL 62368, UL/cUL ETL/cETL 8750, UL/cUL1310 CLASS 2 and in full compliance with UL/cUL ETL/cETL RU/cRU CE ROHS SAA C-TICK KC KCC GS TUV FCC CB NOM CCC PSE CB certifications for global markets.