Q: In construction, is it acceptable to tie off to roof carts that weigh about 500 lbs.?
A: No. The anchor point should not be mobile and should follow the guidelines of 29 CFR 1926 Subpart M:
1926.502(d)(15) - Anchorages used for attachment of personal fall arrest equipment shall be independent of any anchorage being used to support or suspend platforms and capable of supporting at least 5,000 pounds (22.2 kN) per employee attached, or shall be designed, installed, and used as follows:
1926.502(d)(15)(i) - as part of a complete personal fall arrest system which maintains a safety factor of at least two; and
1926.502(d)(15)(ii) - under the supervision of a qualified person.