1. No employer shall use a trestle scaffold, or permit it to be used, unless -
a. it is soundly constructed of solid material, and
b. all reasonable precautionary measures have been taken to prevent the unexpected spreading of its supporting legs when it is in use.
2. No employer shall use a trestle scaffold or permit it to be used, if it -
a. is higher than 3 m; or
b. consists of more than two tiers.