Read a osha.europa.eu factsheet (download below) on the health and safety of workers with disabilities. Although written for the EU many of the article's points are common sense.
People with disabilities should receive equal treatment at work. This includes equality regarding health and safety at work.
Health and safety should not be used as an excuse for not employing or not continuing to employ disabled people. In addition, a workplace that is accessible and safe for people with disabilities is also safer and more accessible for all employees, clients and visitors. People with disabilities are covered by both European anti-discrimination legislation and occupational health and safety legislation. This legislation, which the Member States implement in national legislation and arrangements, should be applied to facilitate the employment of people with disabilities, not to exclude them.
The 4 page factsheet has sections on the working environment, signposting, communication, work organisation and hours, training and supervision, promotion and transfer etc.