safe-for-entry
as defined in Regulation (EU) No 1257/2013 of the European Parliament and of the Council of…, Article 3(1), point (18) (Definitions)
a space that meets all of the following criteria: (a) the oxygen content of the atmosphere and the concentration of flammable vapours are within safe limits; (b) any toxic materials in the atmosphere are within permissible concentrations; (c) any residues or materials associated with the work authorised by the competent person will not produce uncontrolled release of toxic materials or an unsafe concentration of flammable vapours under existing atmospheric conditions while maintained as directed