Kusho ukuthini ubufakazi bokuqhuma

Busho ukuthini ubufakazi bokuqhuma?

Ukuze siqonde ukuthi kusho ukuthini ubufakazi bokuqhuma, kufanele sibheke umongo wegama kanye nenhlangano eyalichaza. I-National Fire Protection Association (NFPA) yaqala ukushicilela Ikhodi Kagesi Kazwelonke (NEC®) ngo-1897. I-NEC® yaziwa nangokuthi i-NFPA 70 kanye ne-ANSI/NFPA 70 kusukela ekufakweni kwayo endikimbeni yamakhodi e-NFPA.

I-NEC® ihlanganisa izincazelo zezinhlobo ezimbalwa zamasu okuvikela amukelekayo lapho uklama imikhiqizo ezosetshenziswa ezindaweni eziyingozi (ezihlukanisiwe): Ukuvikela ukuqhuma, ukungashisi uthuli, okuqinile, okuhlanjululwe/okucindezelwe, kuphephe ngokwemvelo, futhi kuvalwe nge-hermetically. Lezi zincazelo zibeka imibandela okufanele ihlangatshezwe yizo zonke izingxenye ezifakwe ezindaweni eziyingozi (ezihlukanisiwe).

Ukuze kuhlangatshezwane nemibandela yesilinganiso sokuvikela ukuqhuma, indawo ebiyelwe kufanele ikwazi ukuqukatha noma yikuphi ukuqhuma okuvela ngaphakathi kwendlu yayo futhi ivimbele izinhlansi ezisuka ngaphakathi kwendlu yayo ekuthungeleni umhwamuko, amagesi, uthuli, noma imicu emoyeni oyizungezile. Ngakho-ke, ubufakazi bokuqhuma, lapho ubhekisela ekuvaleni kukagesi, akusho ukuthi iyakwazi ukumelana nokuqhuma kwangaphandle. Esikhundleni salokho, amandla okuvalekile okuvimbela inhlansi yangaphakathi noma ukuqhuma ekubangeleni ukuqhuma okukhulu kakhulu.

Ukwengeza, i-NEC ithi okokusebenza kufanele kuhlangabezane nezidingo zokushisa zohlelo oluthile okufanele kufakwe kulo. Lokhu kusho ukuthi izinga lokushisa lokusebenza kwenjini (kanye nendawo ebiyelwe kuyo) noma enye ingxenye ayikwazi ukuba nkulu kunezinga lokushisa eliphansi kakhulu lokuthungela/lomlilo lamagesi noma izintuli ezisemkhathini lapho ingxenye izofakwa khona.

Zonke izingxenye zilebulwe ku-nameplate yazo ngezigaba ezihlukile eziye zahlolwa futhi zagunyazwa ukufakwa.

Zikalwe kanjani izindlela zokuvikela?

Indlela ngayinye yokuvikela eshiwo ngenhla ivunyelwe ukusetshenziswa kuphela ezinhlelweni eziqondile. Isibonelo, izakhi nezinto zokusebenza ezithobela ukucaciswa kothuli zigunyazwa ukuthi zisetshenziswe ku-Class II, Division 2, noma Class III, Division 1 noma 2 izindawo, kuyilapho lezo ezisohlwini njengobufakazi bokuqhuma zigunyazwa ukusetshenziswa Ekilasini I, Isigaba 1 noma 2 izindawo.

Ngokuvamile, leyo mikhiqizo esohlwini lokuhlukaniswa okuphezulu idlula izimfuneko zezigaba eziphansi. Eqinisweni, i-NEC® ibeka ngokucacile “Izisetshenziswa ezikhonjwe indawo ye-Division 1 zizovunyelwa endaweni ye-Division 2 yekilasi elifanayo, iqembu, kanye nesigaba sezinga lokushisa,” ngaleyo ndlela kuthobelana nezimfuneko zezindawo ze-Division 2 [ANSI/NFPA 70:500.8( A)(2)].

Ubani ohlola okokusebenza kobufakazi bokuqhuma?

Amalabhorethri aqashelwa kuzwelonke afana ne-Underwriters Laboratories ne-Intertek asebenzisa amamaki ukukhombisa ukuthi imikhiqizo abayihlolile ihambisana namazinga abekwe yi-(NFPA) nezinye izinhlangano zamazinga omhlaba. Lawa mamaki, ahlanganisa i-UL, i-CSA, i-ETL, namanye, angabhekwa ukuze kunqunywe ukuthotshelwa kwamazinga. Imikhiqizo engenawo lawa mamaki ingase ingahlangabezani nezimfuneko ze-NEC.

I-prototype elungele ukukhiqizwa ithunyelwa elabhorethri yokuhlola. Uma isigunyaziwe, leyo labhorethri ithumela abahloli kumkhiqizi ngezikhathi ezithile ukuze baqinisekise ukuthi akukho okushintshiwe ekwakhiweni noma ekukhiqizweni kwengxenye.

Amasistimu Akhethekile aklanyelwe ukusebenza

Ngokungafani namasistimu athengiswa izilungisi ze-HVAC, amayunithi enziwe ama-Specific Systems akhiwe kusukela eshidini lensimbi kuya ekukhethweni komminyanisi ukuze ahlangabezane namazinga abekwe ku-NEC.®. I-Specific Systems isebenzisa kuphela izingxenye ezigunyazwe ngokugcwele nezinelebula nezindlela zokufaka izintambo kuwo wonke amasistimu.

· Ama-compressor wokuskrola avaliwe kuwo wonke amayunithi

· Amamotor ajwayelekile avaleke ngokuphelele, apholile ngabalandeli (TEFC).

· Class I Div 1 eziyingozi duty motors, lapho eshiwo

· Amaphaneli okulawula ugesi akhiwe esitolo sethu sikagesi esigunyaziwe se-UL 508A

· I-CSA C/US egunyazwe ama-compressor proof proof

· Ukufakwa kuhlu kwe-UL kanye Nemvume ye-CSA C/US yawo wonke amayunithi e-InPac ne-AirPak

· Zonke izintambo zihanjiswa ngendlela efanele emhubheni futhi zilebulwe ukuze zidlule i-NEC® Amazinga

Ezinye izindawo zokuhluza nezokucubungula zisebenza ezindaweni ezipholile. Ngenxa yamazinga okushisa e-ambient avame ukupholile, ukushisa kuvame ukudingeka kulezi zinhlelo zokusebenza. Kodwa-ke, izifudumezi zekhoyili ezivulekile azikwazi ukusetshenziswa ezindaweni eziyingozi ngenxa yengozi yokuqhuma. Kulezi zinhlelo zokusebenza, ama-fin tube heater angaqhumi kufanele asetshenziswe.

Izifudumezi ezingaqhumeki zihlanganisa izinto zokushisisa amashubhu e-fin kanye noxhumo lukagesi oluvalekile ukuze luhlangabezane nekhodi nokunciphisa izinga lokushisa elingaphezulu. Ama-heaters ama-Specific Systems afakazela ukuqhuma agunyazwe yi-CSA C/US.

Ukwengeza, izifudumezi ze-crankcase ezingaqhume zisetshenziswa kulezi zimo esikhundleni sezifudumezi ezijwayelekile ze-crankcase.

Kuya Ngezinhlelo Eziqondile

I-Specific Systems yakha i-HVAC kanye namayunithi okucindezela ezindaweni eziyingozi (ezihlukanisiwe) kusukela ngo-1974, futhi ingumkhiqizi omdala kunabo bonke embonini. Ngenxa yokuthi sakha amayunithi, sizoba lapha ukuze sikusize nganoma yimiphi imibuzo onayo ngemva kokufaka.