My question was answered via other means, however I will post the answer here. My take...is an item 20kg or less is considered a " 1 man lift ", over 20kg is a "2 man lift "
http://vcds.mil.ca/dsafeg/polpgms/manuals/GSStandards/00native/040009-AG-001-Ch16_e.pdf
10.43.3 No department shall require an employee whose primary tasks do not include manual
lifting or carrying to manually lift or carry materials, goods or things in excess of 20 kg.
10.43.4 Where an employee is required to lift or carry loads in excess of 10 kg manually,
departments shall instruct and train the employee:
(a) in a safe method of lifting and carrying the loads that will minimize the stress on
the body; and
(b) in a work procedure appropriate to the employee's physical condition and working
conditions.
It also makes reference to 45 kg, but specific rules apply.
10.43.6 Where an employee is required to lift or carry loads in excess of 45 kg manually or
where the employee is required to lift or carry persons, the instructions given to the employee in
accordance with 10.43.4 and 10.43.5 shall be:
(a) set out in writing;
(b) readily available to the employee to whom they apply;
(c) kept by departments for a period of two years after they cease to apply; and
(d) reviewed annually with the employee.