mankhwala

5.4 Ma Wiring mu Malo Owopsa Ma FTA a Nonincendive (ochepera pano) Ena mwa ma Field Termination Assemblies (FTAs) omwe amagwiritsidwa ntchito mu High-Performance Process Manager subsystem ali ndi zopinga m'mabwalo otulutsa kuti achepetse zomwe zilipo ku ma terminals akumunda. Mabwalo otulutsa awa adawunikidwa ndikutsimikiziridwa ndi Factory Mutual ngati Nonincendive. Izi zikutanthauza kuti ngati mawaya akumunda atsegulidwa mwangozi, kufupikitsidwa, kapena kukhazikika ndipo HPM ikugwira ntchito moyenera, mawayawo samatulutsa mphamvu zokwanira kuti ziwotche mumlengalenga womwe ukuyaka. Table 5-3 ndi mndandanda wa zolowetsa za analogi, zotulutsa za analogi, ndi ma FTA a digito omwe ali ndi zotuluka za Nonincendive. Komanso, mabwalo a digito amtundu wa FTA akakhala apano komanso ma voliyumu amachepera pamlingo woyenera ndi wogwiritsa ntchito, FTA ya digito imathanso kuganiziridwa kuti ndi Nonincendive. Chingwe ndi katundu magawo (magawo a bungwe) Kuonetsetsa kuti mabwalo akumunda sangathe kuyatsa nthunzi yoyaka moto, kukula kwa chingwe ndi zolemetsa ziyenera kudziwika ndikuyendetsedwa. Table 5-3 imapereka zikhalidwe zovomerezeka zovomerezeka pagawo lililonse la FTAs zomwe zalembedwa patebulo. Chivomerezo cha malamulo amagetsi Nthawi zambiri, mawaya am'munda mu Gawo 2 malo oopsa amayenera kuchitidwa molingana ndi ma code amderalo; komabe, m'madera ena, mawaya a Nonincendive sayenera kugwirizana ndi malamulo a waya wa Division 2, koma amatha kugwiritsa ntchito njira zamawaya zomwe zili zoyenera malo wamba. Onani ANSI/ISA S12.12, gawo lakuti “Zida Zamagetsi Zogwiritsiridwa Ntchito M’kalasi I, Gawo 2 Malo Owopsa [Osankhidwa].” Mtengo wa zopinga zomwe zili pa FTA zomwe zatchulidwazi zinasankhidwa kuti zitsimikizire mafunde afupiafupi kwambiri pamalo owopsa osakwana mamilimita 150 pazida zogwirira ntchito wamba. Malinga ndi kufalitsa kwa NFPA #493, Zida Zotetezedwa Zomwe Zikugwiritsidwa Ntchito mu Gawo 1 Malo Owopsa, mamilimita 150 kuchokera ku gwero la 24 Vdc ali pansi pa malo omwe amayatsa mumayendedwe olimbana ndi mpweya m'magulu A mpaka D.