ONE of South Africa's largest public sector unions gave notice of its intention to strike after rejecting a 3% wage offer from the government. The Public Servants Association (PSA), which says it has more than 235,000 members, could embark on a national strike from Wednesday next week, potentially affecting service delivery across government departments. It would be the first major strike in the public sector since 2010. Salary negotiations began in May, with unions initially demanding a 10% increase, but this was later revised down to 6.5%. The government had hoped to conclude wage negotiations ahead of its mid-term budget…