Abstract: A separator is disclosed for a flat, substantially vertical electrode plate in an electric accumulator. An electrode array is also disclosed which consists of alternatingly placed positive and negative, flat, substantially vertically arranged electrode plates, and said separators. The separator is of the type which comprises two substantially vertical, U-shaped edge insulating members. According to the invention these are kept together by a bottom strip and two parallel top strips, all strips being substantially horizontal, and at least one vertical insulating rod between each top strip and the bottom strip, a space for the electrode plate being formed within said separator.