Yes there are standards up here in QLD atleast where we have moved to VSB1 (Vechile Standards Bulletin 1) National Code of Practice for Building of small trailers that do not exceed 4.5tonnes.
AS4177.4 for the safety chain
AS2741 for the shackle.
Link: Vehicle Standards Bulletin VSB1
I recently had to design a small trailer for work (though not small by what was towing it) and this is what I went from. As for yearly testing of the safety chains I made a call not to as the trailer isnt registered and the chain breaking load is 6 times that of the trailer mass and travels at max 10 km/hr. Your circumstances may dictate otherwise as a road registered trailers, I would request a written letter from your state OHS agency clarifying thier position on the issue.
Also a possible heads up on another issue, restraining of loads in utilities and on trailers. Have a look at what are "rated" tie down points, "rated" restraining straps ect. Absolute legal minefield.
AS4177.4 for the safety chain
AS2741 for the shackle.
Link: Vehicle Standards Bulletin VSB1
I recently had to design a small trailer for work (though not small by what was towing it) and this is what I went from. As for yearly testing of the safety chains I made a call not to as the trailer isnt registered and the chain breaking load is 6 times that of the trailer mass and travels at max 10 km/hr. Your circumstances may dictate otherwise as a road registered trailers, I would request a written letter from your state OHS agency clarifying thier position on the issue.
Also a possible heads up on another issue, restraining of loads in utilities and on trailers. Have a look at what are "rated" tie down points, "rated" restraining straps ect. Absolute legal minefield.
