B.O.505 Consult is the practice of Björn Hall, an independent consultant, inspector and sakkunnig on fire and voice evacuation alarm. He holds SBSC certification as behörig ingenjör brandlarm and the firm holds SBSC certificate 17-385 as besiktningsfirma brandskyddsanläggningar under SBF 1003:5, alongside approval as an SBR entreprenadbesiktningsman. The work is contract, delivery and revision inspection of fire and voice alarm and contract and status inspection of electrical and telecom installations, plus early-stage coordination and quality review of installation contracts, technical function testing before handover, and in-house training.