iimveliso

5.4 I-Field Wiring kwiiNdawo ezinobungozi Ii-FTA ze-Nonincendive (i-current limiting) Ezinye zee-Field Termination Assemblies (FTAs) ezisetyenziswa kwi-High-Performance Process Manager subsystem zinezixhasi kwiisekethe eziphumayo ukukhawulela ezikhoyo ngoku kwii-terminals zentsimi. Ezi sekethe zemveliso ziye zavavanywa zaza zaqinisekiswa yi-Factory Mutual njenge-Nonincendive. Oku kuthetha ukuba ukuba iingcingo zentsimi zivuliwe ngengozi, zifutshane, okanye ziphantsi kwaye i-HPM isebenza ngokuqhelekileyo, i-wiring ayiyi kukhulula amandla okwaneleyo okubangela ukuvutha kwimeko ecacileyo evuthayo. Itheyibhile 5-3 luhlu lwegalelo le-analog, i-analog output, kunye ne-digital input FTAs ezineziphumo ze-Nonincendive. Kwakhona, xa iisekethe zedijithali zemveliso ye-FTA yedijithali ikhoyo kwaye amandla ombane anqunyelwe kumanqanaba afanelekileyo ngumsebenzisi, imveliso yedijithali yeFTA inokuqwalaselwa njengeNonincendive. Ikhebula kunye neeparitha zokulayisha (iiparamitha zequmrhu) Ukuqinisekisa ukuba iisekethe zentsimi azikwazi ukutshisa umphunga ovuthayo ocacileyo, ubukhulu bekhebula kunye neeparitha zomthwalo kufuneka zaziwa kwaye zilawulwe. Itheyibhile 5-3 inika amaxabiso aphezulu avumelekileyo eeparamitha kwi-FTA nganye edweliswe kwitheyibhile. Ukuvunywa kwekhowudi yombane Ngokuqhelekileyo, i-wiring yentsimi kwiCandelo 2 iindawo ezinobungozi kufuneka zenziwe ngokweekhowudi zendawo; nangona kunjalo, kwezinye iindawo, iingcingo ze-Nonincendive akufuneki zihambelane nemigaqo ye-wiring yesiqhelo yeCandelo 2, kodwa inokusebenzisa iindlela zocingo ezifanelekileyo kwiindawo eziqhelekileyo. Jonga i-ANSI/ISA S12.12, icandelo elithi “Isixhobo soMbane esiSetyenziswa kwiKlasi yoku-I, iCandelo lesi-2 leNdawo eziBubungozi [eziKhethiweyo].” Ixabiso langoku lokukhawulelana nokunciphisa Ixabiso lezinto ezixhathisayo kwii-FTA ezidwelisiweyo zakhethwa ukuqinisekisa eyona meko imbi kakhulu imisinga emifutshane yesekethe kwindawo enobungozi engaphantsi kwe-150 milliamp kwizixhobo zokusebenza eziqhelekileyo. Ngokopapasho lweNFPA #493, IziXhobo eziKhuselekileyo ngokwangaphakathi eziSetyenziswa kwiCandelo loku-1 leNdawo ezinobungozi, i-150 milliamp esuka kumthombo we-24 Vdc ingaphantsi komda wokutshisa kwisekethe echasayo yeegesi kuMaqela A ukuya ku-D kubume bemeko.