If there is inadequate clearance and no pedestrian escape route of at least 0,5 m wide and 2,1 m high (see Table A.1 and Tables A.2, C.1, C.2 and C.3 clearance dimensions), then personnel detection means shall be active to ensure detection of persons to within 180 mm between edge of safety fields of ESPE and surrounding objects in order to check this zone is free of persons (e.g. block storages).