MS-EBG 2017-08-02 by Mitsubishi Electric Factory Automation

More catalogs by Mitsubishi Electric Factory Automation | MS-EBG 2017-08-02 | 8 pages | 2019-12-13

Ads

Page 7 of MS-EBG 2017-08-02

ms-ebg internal arc classification iac for switchgear and controlgear requiring optional internal arc classification to the aflr standard a gas exhaust duct must be fitted onto the top of panel the gas exhaust duct ensures that in the event of an internal arc fault any hot gases or vapours are channelled away from personnel in the vicinity of the panel the gas exhaust duct may extend to the open air outside the substation or a safe area within the substation the straight extension two meters width which is standard is available the part of extension duct to reach to the open air will be supplied by others the gas exhaust duct is dismantled from the panels prior to shipping and is reinstalled after the panels are installed on site with the gas exhaust duct the switchgear and controlgear are designed to protect persons in the event of an internal arc fault of up to 40 ka for 1 second thus in the event of internal arcing there is no ejection of parts no expulsion of hot gases except from the gas exhaust duct and the enclosure remains earthed minimum clearances of within the substation of 600 mm 100 mm and 800 mm from the panel to the room’s ceiling side walls and back wall respectively are required internal arc containment classification aflr – signifies that the switchgear and controlgear are designed for access from the front lateral ends and rear by authorised personnel only afl – signifies that the switchgear and controlgear are designed for access from the front and lateral ends by authorised personnel only a gas screen can be selected instead of the gas exhaust duct on the condition that ceiling height from floor of electrical room is 4400 mm or over panel dimensions 7 note dimension x 650/800/1000 mm depending on rating and voltage of switchboard dimensions shown are for upto 12 kv versions