Phakamela umhloli we-voltage

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Umhloli weVoltage Voltage uyindlela esheshayo futhi elula yokuhlola ngokuphepha izintambo, izisekelo, ukushintshana, noma izibani ezindala eziye zayeka ukusebenza. Leli ithuluzi eliwusizo ukuthi wonke ugesi uthwalwa naye. Ngemuva kokukhuluma nogesi omkhulu oneminyaka engama-20 yokuhlangenwe nakho nokusebenzisa amamodeli ayisikhombisa aholayo izinyanga eziyisishiyagalombili zokuhlola, sithole ukuthi uKlein NCVT-3 uyisinqumo esihle kakhulu.
UKlein angabona ama-voltage ajwayelekile kanye nogesi ophansi, futhi afakwe i-flashlight elula - lapho ukukhanya kuvaliwe, ungadinga ithuluzi elihle.
I-Klein NCVT-3 iyimodeli ye-voltage voltage, ngakho-ke irekhodi lamandla ajwayelekile (i-wiring yangaphakathi) kanye namandla kagesi aphansi (njengokunisela, umnyango we-thermostat, thermostat). Ngokungafani namanye amamodeli esiwahlole, angahlukanisa umehluko phakathi kwalokhu okubili. Lesi sici siphinde senze sihambisane nezinyawo zeTamper-proof manje ezidingeka ngokucaciswa ngogesi. Izilawuli ku-NCVT-3 zinembile futhi zibonisa zicacile. Uma kuhlolwe kwiphaneli ye-Breaker Breaker egcwele izintambo ezibukhoma nezifile, kuyazwela ngokwanele ukufunda izintambo ezifile kusuka ebangeni elifushane ngaphandle kokubikwa ngamanga izintambo ezibukhoma ukusuka eduzane. Kepha isici esiwusizo kakhulu empeleni yi-flashlight yayo ekhanyayo ye-LED, engasebenza ngokuzimela komhloli we-voltage. Ngamathuluzi avame ukusetshenziswa emaceleni amnyama noma lapho amalambu engasebenzi, lesi yisici sesibili kodwa esiwusizo kakhulu, futhi i-Klein kuphela imodeli esiyihlolile ngalesi sici. Ngokusho kwenkampani, ithuluzi lingaphatha futhi amaconsi afinyelela kumamitha ayi-6.5, okungekuhle ukucubungula kungumkhiqizo we-elekthronikhi oyinkimbinkimbi.
Lo mhloli we-voltage voltage uyafana nokuzikhethela kwethu ngezindlela ezibaluleke kakhulu, kepha eminye imininingwane yayo encane iyacasula.
Uma ungakwazi ukuthola i-klein, nathi sithanda umtshina wamandla we-milwaukee 2203-20 nge-LED. Izindleko zayo zicishe zifane, futhi zifana namazinga wokuhlola ama-klein kanye namandla kagesi aphansi, nokusebenziseka kalula. Kepha ithoshi aliqhakaze kangako futhi alikwazi ukusetshenziswa yedwa ngaphandle komhloli. Ibuye ikhiphe i-beep enkulu kakhulu futhi akukho okukodwa okuyisimungulu.
UKlein angabona ama-voltage ajwayelekile kanye nogesi ophansi, futhi afakwe i-flashlight elula - lapho ukukhanya kuvaliwe, ungadinga ithuluzi elihle.
Lo mhloli we-voltage voltage uyafana nokuzikhethela kwethu ngezindlela ezibaluleke kakhulu, kepha eminye imininingwane yayo encane iyacasula.
Bengilokhu ngibhala futhi ngibukeza amathuluzi kusukela ngo-2007, futhi izindatshana zishicilelwe ekwakhiweni okuhle kwasekhaya, le ndlu endala, i-science ethandwayo, imishini edumile namathuluzi okuhweba. Ngiphinde ngasebenza njengombazi, induna kanye nomphathi weSayithi iminyaka eyi-10, ngisebenza kumaphrojekthi wokuhlala ama-Dollar anezigidi eziningi. Ngo-2011, ngadiliza nepulazi lami elineminyaka engu-100, elalidinga uhlelo olusha kagesi.
Ngeminye imininingwane mayelana nabahloli bamagesi abangaxhumana nabo, ngangikhuluma nabantu abazisebenzisa nsuku zonke: UMark Tireney weTierney ugesi, i-hopkinton, iMassachusetts. UTierney uneminyaka engama-20 yesipiliyoni futhi ubelokhu esebenza nenkampani yakhe kusukela ngo-2010.
Umhloli weVoltage Voltage udinga kuphela ukuthi asondele ukuthola okwamanje ocingweni noma kwisokhethi. 1 Usayizi nokwakheka kwamafutha abukhali. Ukutholwa kwenzeka endaweni yokuphenya. Ezimweni eziningi, i-Plospe Tip yakhelwe ukuthi idonswe endaweni yokuphuma. Njengoba ukushaqeka kukagesi akumnandi kakhulu futhi kube yingozi kakhulu, leli thuluzi liwusizo ngisho nemisebenzi kagesi elula kunazo zonke, njengokuxazulula inkinga ye-thermostat noma ukufaka i-dimmer switch.
Ngokusobala, iyithuluzi elihle kakhulu labesifazane be-DIY, kepha ngisho nabantu abanokuthambekela kukagesi zero bangazuza ngokuba neyodwa. Imvamisa ngiyisebenzisa njengesigaba sokuqala sokuxazulula inkinga ngaphambi kokubiza ugesi ochwepheshe.
Umhloli ongaxhumana naye angasiza futhi umake uhlelo lwakho lukagesi olukhona. Angikaze ngihlale kunoma iyiphi indlu esondelene nephaneli elinele elibiwe. Uma unendlu endala noma ifulethi, kungenzeka ukuthi iphaneli likagesi kungenzeka futhi langafaneleki. Ukuxazulula le nkinga inqubo edla isikhathi, kepha kungenzeka. Cisha wonke amakhefu wesifunda ngaphandle kweyodwa, bese ubheka umsebenzi wendlu. Uma usuyitholile, ilebula umfutho wesifunda bese udlulela kwelilandelayo.
Abahloli abaningi abangaxhumana nabo baqopha kuphela ama-voltages ajwayelekile. Ngemuva kokufunda ngale ndaba, sanquma ukuthi umhloli we-voltage ahlukaniswa ama-voual ulungele kakhulu amabhokisi amathuluzi asekhaya. Okwe-voltage ejwayelekile, kusengasebenza ngokujwayelekile, futhi kunenzuzo eyengeziwe yokutholwa kwamandla kagesi okuphansi, okuwusizo kuma-socbells, ama-thermostats, eminye imishini ye-av, ukunisela nokukhanyisa okuthile kwendawo. Amanani entengo yamamodeli we-Dual-Voltage kanye ne-Single-Voltage ikakhulukazi phakathi kwe-US $ 15 naku-US $ 25, ngakho-ke amadivaysi anhlobonhlobo enza umqondo njengethuluzi lokuma elilodwa labangewona ochwepheshe; Ukuba namandla futhi ungasebenzisi kubaluleke kakhulu kunokuyidinga futhi hhayi. Kuhle.
Lapho sinquma ukuthi yimaphi amamodeli wokuhlola, safunda i-Amazon, idepho yasekhaya, futhi yehlisa imikhiqizo. Siphinde sabhekisisa abakhiqizi bamandla amathuluzi adumile. Kusukela lapho, sinciphise uhlu kwabayisikhombisa.
Siqhube ezinye izivivinyo ukuthola ukusebenziseka okuphelele nokuzwela komhloli ngamunye. Okokuqala, ngacima umfutho wesifunda ebhokisini likagesi futhi ngazama ukuthola ukuthi yiziphi izintambo ezingama-35 eziphumayo zaphukile. Emva kwalokho, ngathatha ucingo olufile ukubona ukuthi ngingaletha ithuluzi lisondele kucingo olubukhoma futhi ngisathola umhloli ukuba afunde ne-negative. Ngaphezu kwalezi zivivinyo ezihlelekile, ngiphinde ngasebenzisa umhloli ukuxhumanisa izisekelo ezithile futhi ngifake ukushintshwa kwama-dimmer, ama-cooktops, abalandeli bophahla, abalandeli be-chandeliers.
UKlein angabona ama-voltage ajwayelekile kanye nogesi ophansi, futhi afakwe i-flashlight elula - lapho ukukhanya kuvaliwe, ungadinga ithuluzi elihle.
Ngemuva kokucwaninga ngezihloko, ukukhuluma nogesi, kanye nokuchitha amahora amaningi kuhlola amamodeli ayisikhombisa aholayo, sincoma uKlein NCVT-3. I-NCVT-3 inokukhanya okunembile kakhulu kwenkomba, inkinobho enhle ku / Off inkinobho kanye ne-LED ye-onboard esebenza njengethoshi elincane. Lesi yisici esihle, ngoba lapho ubheka i-wire voltage, ukukhanya kungenzeka kungasebenzi kahle. Ihambisana futhi ne-tamper-procket socket edingwa yikhodi yamanje. I-NCVT-3 inenkomba yempilo yebhethri kanye nomzimba oqinile ovikela imishini yawo yobuchwepheshe obucayi kusuka kumaconsi afinyelela kwezinyawo ezi-6.
Okubaluleke kakhulu, i-NCVT-3 kulula ukuyisebenzisa. Kuyithuluzi elihlaya lomuntu, ngakho-ke lingabona ama-voltages ajwayelekile (izisekelo, izintambo ezijwayelekile) kanye nama-voltages aphansi (umnyango, thermostat, i-wiring yokunisela). Abahloli abaningi bathola kuphela ama-voltages ajwayelekile. Ngokungafani namanye amamodeli amaningi wobubanzi obumabili, ingashintsha ngokuzenzakalelayo phakathi kwamabanga ngaphandle kokusebenzisa ukudayela kokuzwela okuxakayo. Igrafu ye-LED ye-LED ohlangothini lwethuluzi libonisa amavoti osebenzelana nawo. Ukutholwa kwe-voltage ephansi kukhanyisa amalambu amabili we-orange ezansi, futhi i-voltage ejwayelekile ikhanyisa eyodwa noma ngaphezulu kwamalambu abomvu amathathu phezulu. Izinkampani eziningi zithengisa izithonjana ezihlukile zengcindezi ephezulu nephansi, kodwa kwabangewona ochwepheshe, kunengqondo ukubabeka ephathekayo eyodwa, ikakhulukazi uma kulula ukusebenza njenge-klein.
Endlini yangasese yami, izintambo zibethelwa ophahleni ngaphezu kwezibani ze-fluorescent, ngakho-ke noma ngabe izibani zivuliwe, kunzima ukusingatha izintambo. Kula mamodeli amabili ane-flashlights, i-NCVT-3 yiyona kuphela engasebenza ngokuzimela komsebenzi wokuhlola, okulungile impela.
I-Flashlight ye-LED igqamile ye-NCVT-3. Endlini yangasese yami, izintambo zibethelwa ophahleni ngaphezu kwezibani ze-fluorescent, ngakho-ke noma ngabe izibani zivuliwe, kunzima ukusingatha izintambo. Kula mamodeli amabili ane-flashlights, i-NCVT-3 yiyona kuphela engasebenza ngokuzimela komsebenzi wokuhlola, okulungile impela. Lapho umhloli esebenza, kuzoba nochungechunge lwezibani nezibani ezikhanyayo. Uma nje ufuna ukusebenzisa ithoshi, kuhle ukukwazi ukukugwema. Ukukhetha kwethu umgijimi, umtshina we-milwaukee 2203-20 uVoltage Detector nge-LED futhi unomsebenzi wethoshi futhi unomsebenzi wethoshi, kepha kuzokhanya kuphela lapho kuvulwa umhloli, ngakho-ke, akumele ulalele ukugcwala, ayikho indlela Uma usegumbini elikhanyiswe kahle cisha ithoshi lapho usebenza edolobheni. I-NCVT-3 LED ibuye igqame kakhulu kune-milaukee.
I-NCVT-3 nayo inomuzwa oqinile kakhulu. Ngokusho komenzi, ingamelana nokwehla kwe-6.5-unyawo, ngakho-ke uma uhlangabezana nokuwa, le modeli izokunikeza ithuba lokusinda. Ngaphezu kwalokho, izinkinobho zivaliwe, futhi isembozo sekhamera yebhethri sivaliwe, ngakho-ke i-NCVT-3 ingamelana nemvula encane nomswakama. UKlein unevidiyo mayelana nethuluzi, futhi kubukeka sengathi kungaphansi kompompi wokudonsa.
Lapho sibuza i-Electricial Mark Tierney uma encoma noma yimuphi umenzi womninikhaya, wasitshela "othembeke kakhulu nguKlein." Ubuye athanda amamodeli anama-LED. Uthe lokho kubanini bamakhaya, "bazothola izici ezimbili ezinhle ephathwayo eyodwa."
Mayelana nempilo yebhethri, uKlein uthe amabhethri amabili e-AAA azohlinzeka ngamahora angama-15 wokusetshenziswa okuqhubekayo kwe-testerter kanye namahora ayi-6 ukusetshenziswa kwethoshi okuqhubekayo. Lokhu kwanele kubasebenzisi ngezikhathi ezithile, njengoba sishilo, kuhle ukuba nenkomba yebhethri ukuze wazi uma kuphansi.
Asikho kuphela abathanda i-NCVT-3. Clint deboer, obhale eProtoolReviews, wathi ithuluzi "noma ngabe wenza umsebenzi kagesi ngezikhathi ezithile, cishe ungakuthola kalula." Waphetha: "Leli ithuluzi elakhiwe kahle elingakwenza lokho okufanele nalo nalo. Kuhle kakhulu. Khetha eyodwa. Ngeke uzisole. "
I-NCVT-3 nayo ithole izibuyekezo ezakhayo ngokujwayelekile kwi-Amazon naseKhaya Depot. Iningi lezindaba ezingezinhle ku-Amazon livela kubantu abathanda ithuluzi kepha badumale ngokuthi ngeke baxhunywe kwisokhethi. Njengoba kushiwo ngenhla, lokhu akuyona inkinga ngoba kusengabona okukhona njengamanje futhi kukhombise kuphela njenge-voltage ephansi (futhi kwenze kube yi-socket insokhethi edingwa yikhodi). Ukuze uqinisekise ngempela i-vattage voltage esokhethi, kulula ukukhombisa isembozo bese ubeka ithiphu lethuluzi ohlangothini lwesokhethi lapho izintambo zitholakala khona.
I-NCVT-3 ihlukile ngoba ayikwazi ukuxhunywa kwisokhethi. Uma uqala ukubheka nje, lokhu kubonakala kuyinkinga, njengoba iningi labavukuzi abangaxhumana nabo lingafunda amandla avela kwisokhethi ngokulifaka ekuvuleni. Iqiniso ngukuthi ngoba lingafunda ama-voltages aphansi, i-NCVT-3 isengakwazi ukudweba okwamanje kusuka ngaphandle kwesokhethi, okubaluleke kakhulu lapho kusebenza nezisekelo zeTamper-Proquef ezidingekayo ngamakhodi kagesi. Ukufaka ipulaki ibe ngenye yezisekelo, ingcindezi elinganayo idinga ukusetshenziselwa ukuvuleka kwephinithi emibili (le yinkinga yezokuphepha yezingane). Ngalezi zinto, umhloli we-voltage wendabuko ongaxhumana naye akasebenzi ngaso sonke isikhathi ngoba angafunda kuphela ama-voltages ajwayelekile. NjengoBruce Kuhn, umqondisi womkhiqizo wokuthuthukiswa komkhiqizo, ukuhlolwa kanye nokulinganisa eKlein, usitshele, "Uma wenza umhloli onjalo uzwele ngokwanele ukuthola i-voltage 'ye-supper-procket suocket, khona-ke ibhokisi kagesi. Ucingo olushisayo. " 2 Ngoba i-NCVT-3 yenzelwe ukuthola i-voltage ejwayelekile ne-voltage ephansi, lapho ifakwa ekuvuleni isokhethi lobufakazi obukhoma, lizothatha i-voltage ejwayelekile, kepha kusukela kude, kubonakala sengathi kungamandla kagesi aphansi, usaqinisekisa ukuthi isokhethi liyaphila.
Kunezinkinobho zokulawula eceleni kwe-NCVT-3, uTierney asitshele ukuthi sinake. Uxwayise ngokuthi amamodeli anezinkinobho eziseceleni kulula ukuvula lapho ebekwe ephaketheni, okungahambisani nje, kepha futhi kusheshisa ukusetshenziswa kwebhethri. Umehluko owodwa ovela ku-NCVT-3 ukuthi izinkinobho zigcwele phezulu. Izinkinobho eziningi ezinjengale porrude kusuka ohlangothini lwethuluzi futhi zingasebenza kalula ngengozi. Ngisebenzise i-NCVT-3 ephaketheni lami ngosuku, futhi ayikaze ivulwe.
Lo mhloli we-voltage voltage uyafana nokuzikhethela kwethu ngezindlela ezibaluleke kakhulu, kepha eminye imininingwane yayo encane iyacasula.
Uma uKlein engatholakali, sincoma umtshina wamandla kagesi we-milwaukee angama-2203-20 nge-LED. Inemisebenzi eminingi efanayo neKlein NCVT-3, kepha ithoshi aliqhakaze futhi alikwazi ukusetshenziswa ngokuzimela komhloli. Ibuye ikhiphe i-beep enkulu kakhulu (akukho inketho eyisimungulu). Lokhu kungahle kube yinzuzo endaweni yomsebenzi onomsindo, kepha ngemuva kokuthi ngichithe imizuzu engama-45 ngibheka izintambo ezisegumbini elingaphansi, ivolumu lalinele ukungenza ngihlanya kancane.
Noma kunjalo, iMilwaukee ingabona i-voltage ephansi kanye ne-valetage ejwayelekile, futhi akukho shintsha ebhukwayo phakathi kwabo, ngakho-ke kulula ukuyisebenzisa njenge-NCVT-3.
Ngo-2019, sabona ukuthi uKlein manje ungumnikazi we-ncvt-4ir. Kubukeka okufana nokukhetha kwethu, kepha kuhlanganisa nomsebenzi we-thermometer ofrared. Sikholwa ukuthi lokhu akufaneleki izindleko ezandisiwe zokusetshenziswa kwangaphakathi kwasendlini.
Siphinde sabona amamodeli ezinkampanini ezinjenge-meterk, tohayie, taiss, kanye ne-socll. Lawa ngamathuluzi ajwayelekile avela ezinkampanini ezingaziwayo. Sibona sengathi kuphephile ukuncoma abahloli abavela kubakhiqizi bemishini kagesi eqinisekisiwe.
Sihlole uKlein NCVT-2, ofana kakhulu ne-NCVT-3. Futhi kuyimodeli yebanga elimbili elingabona ngokuzenzakalelayo phakathi kwamabanga amabili, kepha alinayo i-LED; Inkinobho ye-On / Off iyaziqhenya ngayo (ngakho-ke kungenzeka ivulwe ephaketheni); Futhi icala alinazo lokho okuhlala isikhathi eside.
Siphinde sabona uGreenlee GT-16 noSpellery Vd6505 basebenzise ukudayela ukukhetha ukuzwela phakathi kwamandla kagesi aphansi kanye namandla ajwayelekile. Ngesikhathi sokuhlolwa kwethu, sathola ukuthi lapho kunezintambo eziningi kule ndawo, lezi zinhlobo zizothola amasiginali avela kwezinye izintambo, okwenza kube nzima ngathi ukwazi ukuthi uzwela luncipha lapho kuphela izintambo esizifunayo. Kunzima ukukwazi amaqhinga okudayela kokuzwela, futhi ukhetha interface elula ye-milwaukee kanye nasekins.
IGreenlee Tr-12A inomklamo we-PIN amabili ngqo ama-Tamper-Proockets, kepha angafunda kuphela ama-voltage ajwayelekile esikhundleni sama-voltages aphansi, ngakho-ke sicabanga ukuthi i-NCVT-3 ilusizo kakhulu.
I-Klein NCVT-1 ithola kuphela i-voltage ejwayelekile. Ngine-ONE iminyaka eminingi futhi ngihlala ngithola ukuthi inembile futhi ithembekile, kepha kunengqondo ukuthola imodeli engathola nama-voltages aphansi.
Sacela uKlein ukuthi achaze ngokunembile umgomo osebenzayo womhloli wamandla we-voltage. Le nkampani yasitshela: "Idivaysi yokuzwakala kagesi engaxhumana nayo isebenza ngokufaka inkambu ye-electromagnetic ezungeze umqhubi womqhubi onikwe amandla umthombo wamanje (ac). Ngokuvamile, okuphezulu kwamandla kagesi asetshenziswa kumqhubi wesifundo, amandla enkambu yenkambu ehambisanayo evunyisa i-electromagnetic. Inzwa yemishini yokuhlola engaxhumana nayo iyaphendula ngokuya ngamandla enkambu yenkambu ye-electromagnetic. Ngokusekelwe kulo mgomo, lapho umhloli we-voltage Voltage ongenawo oxhumana naye esondelene nomqhubi we-Energy lapho ebekwe, amandla enkambu ye-electromagnetic eyenziwe nge-electromagnetic enza insiza ukuthi ikwazi ukwenza idivaysi "
Ngithathe i-klein ncvt-1 ngizungeze ikhaya lami. Ithola kuphela ama-voltages ajwayelekile. Izinga lokuphumelela lokuthola amandla avela kuma-tamper-proockets cishe ama-75%.
UDoug Mahoney ungumbhali wabasebenzi abaphezulu eWirecutter, emboza ukuthuthukiswa kwasekhaya. Usebenze emkhakheni wezokwakha okuphezulu iminyaka eyi-10 njengombazi, undunankulu nomphathi. Uhlala epulazini elineminyaka engu-250 ubudala, futhi wahlala iminyaka emine ehlanza nokwakha kabusha ikhaya lakhe langaphambili. Ubuye avusa imvu, aphakamise inkomo, ambe amabila njalo ekuseni.
Kulo nyaka sihlole amagundane emidlalo angama-33 ukuthola i-5 efaneleke kakhulu emidlalweni ye-Wireless noma engenantambo, kufaka phakathi ezinye izindlela ezinentengo ephansi.
Ngemuva kwamahora angaphezu kwama-350 okucwaninga nokuhlolwa kwamathuluzi angaphezu kwama-250, siqoqe ikhithi enhle kakhulu ekhaya lakho.
Isiphuzo esihle kakhulu esingesilo utshwala sithanda njengenkimbinkimbi njenge-cocktail etshwala, futhi sigujwa ngokulinganayo. Siphuze iziphuzo ezingama-24 ezingezona zotshwala ukuthola okungcono kakhulu.

I-Voltage Worntate Ukuhlola Ukuhlola kwenziwa ngomthombo ophakeme we-voltage kanye nama-voltage namamitha wamanje. Ithuluzi elilodwa elibizwa nge- "Pressure Test Set" noma "umhloli we-hipot" ngokuvamile asetshenziselwa ukwenza lolu vivinyo. Kusebenza ama-voltages adingekayo kudivayisi kanye nokuqapha ukuvuza kwamanje. Amanje angahamba inkomba enephutha. Umhloli unakho ukukhishwa ngokweqile ngokweqile. I-test voltage ingahle iqondise njengamanje noma iguqule yamanje endaweni yamandla noma imvamisa yemvamisa, njengemvamisa ye-resonant (30 kuya ku-300 hz inqunywe ngumthwalo) noma i-VLF (0.01 Hz kuya ku-0.1 hz), lapho elula. I-voltage ephezulu inikezwa kwizinga lokuhlola lomkhiqizo othize. Izinga lesicelo lingahle lilungiswe ukuphatha ama-currents avuzayo avela emiphumeleni yemvelo yento yokuhlola. Isikhathi sokuhlolwa sincike kwizidingo zokuhlola zomnikazi wempahla kepha zivame ukufika imizuzu emi-5. Amandla kagesi asetshenzisiwe, isilinganiso sohlelo lokusebenza kanye nesikhathi sokuhlola kuncike kwizidingo zokucaciswa kwemishini. Izindinganiso zokuhlola ezahlukahlukene zisebenza nge-elekthronikhi yabathengi, amadivaysi kagesi wezempi, amakheshana aphezulu e-voltage, i-switchgear kanye nezinye izinto zokusebenza. [2]

Imishini ejwayelekile ye-hicot evuza amanje amasethingi we-Trip Limity Timity phakathi kuka-0,1 no-20 Ma [3] futhi abekwe ngumsebenzisi ngokuya ngezimpawu zokuhlola kanye nesicelo seVoltage. Injongo ukukhetha isilungiselelo samanje esingeke sibangele ukuthi umhloli amanga ngesikhathi sohlelo lokusebenza lwe-voltage, ngenkathi ngasikhathi sinye, ukukhetha inani elinciphisa ukulimala okungenzeka kuhlolo uma kuvela khona noma ukwephulwa okungafanele kwenzeka.