The wife of an impotent man: if they are separated, does she owe a waiting period?

Sa'id (bin al-Musayyib) and al-Hasan (al-Basri) said: Sayyiduna Umar (may Allah be pleased with him) gave an impotent man a respite of one year: if he became able to have intercourse with her, (well and good); otherwise the husband and wife would be separated, and the woman would have to observe a waiting period.

Ata (may Allah have mercy on him) said: When the one-year respite has passed, the woman observes the waiting period of a divorced woman, even if the impotent man has not divorced her.

Al-Hasan (al-Basri) said: When an impotent man and his wife are separated, she must observe a waiting period.

Urwah (may Allah have mercy on him) said: When an impotent man and his wife are separated, she must observe a waiting period.