Battery Disconnects and Cabling

New to the NEC in 2008 is the requirement for low voltage battery disconnects. They come in several forms and serve many functions from isolation of single battery strings for maintenance to emergency disconnect. The cabling to the batteries is also a crucial element, because your wire must be sufficiently sized to prevent unwanted voltage drops. We have installed many over the last decade. The photo below depicts a high voltage 480 VDC system.