STANDARDS USED FOR OUR ACTIVITY: (In Brazil)

MTE - Ministry of Labour and Employment.
NR 10 - SAFETY FACILITIES AND SERVICES IN ELECTRICITY
NR 18 - ENVIRONMENTAL CONDITIONS AND WORKING IN THE CONSTRUCTION INDUSTRY - item 18:13
NR-33 SAFETY AND HEALTH IN THE WORK IN confined spaces
NORMA ANAC - Ordinance 1141 gm / 5

ABNT norms are not available online. We always use the latest version of the standard.

ABNT NBR 9541 - Signaling aeronautical obstacles - patterns and colors
ABNT 5419 NBR - Protection structures against lightning