Safety nets must be installed as close as possible under the working platform on which employees are working but in no case more than 30 feet below. When using safety nets on bridges, the potential fall area must not be obstructed. And also, safety nets must extend outward from the projection of the work platform as follows:

Safety nets must be installed with sufficient clearance to prevent contact with the surface or structures under them when subjected to an impact force equal to the drop test described below.

Safety nets and their installations must be capable of absorbing an impact force equal to the drop test described below.

Safety nets and safety net installations must be drop-tested at the job site:

After initial installation and before being used.

Whenever relocated.

After major repair.

At 6-month intervals, if left in one place.

The drop test consists of a 400-pound bag of sand 28-32 inches in diameter dropped into the net from the highest surface at which employees are exposed to fall hazards, but not from less than 42 inches above that level.

When the employer can demonstrate that it is unreasonable to perform the drop-test described above, the employer or a designated competent person shall certify that the net and net installation have sufficient clearance and impact absorption by preparing a certification record prior to the net being used as a fall protection system. The certification must include:

Identification of the net and net installation.

The date that it was determined that the net and net installation were in compliance.

Signature of the person making the determination and certification.

The most recent certification record for each net and net installation must be available at the jobsite for inspection.

Safety nets must be inspected for wear, damage, and other deterioration at least once a week, and after any occurrence which could affect the integrity of the system.

Defective nets shall not be used, and defective components must be removed from service.

Objects which have fallen into the safety net, such as scrap pieces, equipment, and tools, must be removed as soon as possible from the net and at least before the next work shift.

Maximum mesh size must not exceed 6 inches by 6 inches. All mesh crossings must be secured to prevent enlargement of the mesh opening, which must be no longer than 6 inches, measured center-to-center.

Each safety net, or section thereof, must have a border rope for webbing with a minimum breaking strength of 5,000 pounds.

Connections between safety net panels must be as strong as integral net components, and must not be spaced more than 6 inches apart.