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DESIGN/PERFORMANCE REQUIREMENTS

410 WIND LOADING
• General: Design access/ safety system to withstand calculated wind loads with
equipment in position of maximum exposure and in parked position.
• Wind loads: Calculate in accordance with BS 6399-2, Standard Method:
- Basic wind speed (Vb): site specific.
- Altitude factor (Sa): site specific.
- Direction factor (Sd): 1.
- Seasonal factor (Ss): 1.
- Probability factor (Sp): 1.
- Terrain and building factor (Sb), determined from BS 6399-2, table 4 site specific.

420 WIND LOADING
• General: Design the access/ safety system to withstand specified wind loads with
equipment in position of maximum exposure and in parked position.
• Wind loads:
site specific.

430 SAFETY
• General: The equipment as installed must have no irregularities/ projections
capable of inflicting personal injury.
• Finished surfaces and edges of all accessible parts: Regular and smooth.

440 DESIGN LIFE/ MAINTENANCE PROGRAMME
• Design life of access/ safety system: Not less than 15 years.
• Schedule for maintenance and for replacement of components: Submit.

450 TESTING OF PERMANENT SUSPENDED ACCESS EQUIPMENT
• Pre-installation testing: Test roof rig at manufacturer's/ supplier's works. The rig must
be capable of lifting and sustaining a proof load of 125% of the specified rated
load without suffering damage or permanent deformation.
• Post-installation testing: Immediately on completion of installation, or when
otherwise agreed, examine and test the complete installation in accordance with
recommendations given in BS 6037-1, clause 14. Give adequate notice of testing
arrangements.
• Certificates for works and site testing: Submit within 7 days of completion of
satisfactory acceptance tests.

FABRICATION, ASSEMBLY AND INSTALLATION

510 FABRICATION AND ASSEMBLY GENERALLY
• Machine cutting, drilling and assembly: Carry out as much as possible in the
workshop. Obtain approval for any reassembly on site.
• Dissimilar metal surfaces of assembly components/ supports/ fixings: Isolate to
prevent electrolytic corrosion.

520 PROTECTION
• General: Do not deliver to site any components or assemblies that cannot be
installed immediately or unloaded into a suitable well protected storage area.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01