NR-17 Ergonomic Bench Height

NR-17 Workbench Height & Workplace Ergonomics

Brazilian regulation NR-17 (Ergonomics), issued by the Ministry of Labour, lays out how working conditions should be adapted to the psychophysiological characteristics of workers. When it comes to workbench height, the usual rule of thumb comes straight from anthropometric data. Light precision work follows H = elbow_height − 5 cm. Heavy work drops lower, H = elbow_height − 15 cm, so the worker can press down with some force.

A few reference numbers for adults: seated office work sits at 70–72 cm, standing light assembly at 96–98 cm, and standing heavy work at 86 cm. They trace back to the international standard ISO 9241-5 and match the Brazilian Ergonomic Work Analysis (AET — Análise Ergonômica do Trabalho), which becomes mandatory at any workstation where workers report musculoskeletal complaints.

Applications

Occupational safety engineers and ergonomists reach for these figures when specifying office furniture, factory workstations, laboratory benches and checkout counters. Industrial designers lean on the same numbers while prototyping new equipment, and HR teams pull them up during the mandatory NR-17 audits to stay clear of fines from the Auditoria-Fiscal do Trabalho.

FAQ

Are pauses required for intensive typing? Yes. For continuous data-entry work, NR-17 Annex II calls for a 10-minute break every 50 minutes worked, and you can't dock those breaks from the regular workday.

What chair must be provided? One with five wheels, adjustable height, lumbar support and a swivel base. The seat has to let the worker’s thighs sit at a 90° angle relative to the floor.

Is the Ergonomic Work Analysis (AET) mandatory? Yes, whenever the employer is notified of a risk or the labour inspector asks for it. A qualified professional has to carry out the AET, and it stays on file for at least five years.