Industrial-duty cable reels such as Pow-R-Mite® and Pow-R-Matic® are spring-powered reels made of precision electrical and mechanical components to accommodate up to 48.8m (160') of 16/3 AWG cable or up to 15.3m (50') of 6/3 AWG cable. Cable reels have NEMA-3 and NEMA-4 ratings for indoor and outdoor use to protect against water and corrosion for weather and dust resistance. Precision collector rings can be specified for up to 36 conductors.