How to size main circuit breaker and feeder cable of multiple motor loads? | Engr Noel
ฝัง
- เผยแพร่เมื่อ 6 ส.ค. 2020
- This power point presentation we discussed, how to size the main CB & Feeder cables of multiple motor loads of electrical panel.
I hope this will be useful to those new electrical practitioners and to those who needs refresher in electrical design calculations.
Don't forget to like, comment, share and SUBSCRIBE.
Thank you and God bless!
well said sir.. Keep it up. looking forward for more videos.God bless you more
Thank you sa additional learning sir. It will help me as a beginner practitioner. More videos to come sir.
Sir, thank you malaki naitulong, sa akin, kung.pwede maisali pagmention ang cable length para mabalikan namin ang voltage drop..anyway maraming slaamat.
Salamat sir for refreshing
Gusto ko ding mapag aralan yang electrical host very much appreciated
Ok po Yan boss.. may other videos din po ako related sa electrical, panoorin nyo n lng po.. salamat and God bless
Salamat sa info sir
mabuhy ka po sir, maraming salamat sa pag share ng ka alaman❤🇬🇱🇵🇭
Bagong kaibigan d2 Sir..Keep Vlogging Congratz
Monetized kn rin pla.. congrats
1.25% ( I highest) still be included in the appplication of DF ? or 1.25 (I highest) + ( other loads) DF ?
Sir Thank you sa very informative video. Pwedeng paki share ang DF calculation at ang 0.4
What size feeder conductor is required for a 10 HP, 230 volts three phase induction type squirrel cage?
Hi Sir Noel! Sir meron din po ba kayong video tutorial about sa components and computations ng wye-delta motor starter? Salamat po Sir
Salamat ng marami engr.. Sa kaalaman na senishare mo marami akong natutunan. Baka pwd mong gawan ng content ito engr. . amo namin bumili ng chiller trane na 380 ang supply pero ang supply namin ay 220 engr. Ilang kva ang gagamitin na step up na transformer at Kung anong size na cable at ocpd ang gagamitin... Ang nakalagay sa plate engr.
Min. Ampacity nya 501a sa dalawang compressor at ang ocpd nya 700a at sa bawat compressor ang RLA ay 203 salamat engr..
Boss bka pd magturo ka about industrial electrical. Tnxs God Bless!
Hi sir when kaya negligible ang mga correction factors natin?
hello po engr. pwede po mag tanong po about sa Power System Analysis?
sir gud day, may sample computation ka ng main feeder and main breaker para sa MCC panel loaded ng mga accu?
Engr. Pwede ka gawa nang vedio nga 400v 3phase w/ neutral 230v 1phase na schedule of load base? sa NEC? Thank.
What is the service entrance for a building with two different voltage requirements (380V and 220V)
Sorry late ko napanood video mo engr. Tanong ko lang sa ahu, bakit di na consider ang motor locked rotor sa size ng CB( inverse time? Yong 250% it is included already? Thank you
Good pm engr... Ask lang po.... Yung FLA ng motor is 39.3 Amps.. Naka star delta starter motor control..x250% parin bah which is 100AT na breaker or enough na yung 63AT na breaker.. Thanks
Good Content Sir. I would like to ask if those following formulas are use for three phase load only? or it can be use both for Single phase and three phase. Thanks.
The formulas used on this video was for three phase, but the procedure is applicable to single phase. Take note that single phase formula is different from three phase.
@@NoelLaude Thanks po sir.
sir saan po kinuha ang devide 0.40?
Sir tanong ko Lang po Kung sa mga commercial spaces o unit sa Loob ng Mall... May MAIN feeder pa po ba Sir papasok sa Meter? Tapos bukod pa yong wire from meter to main breaker?
very informative! thank you sir noel! pa.request naman po, paano ang transformer capacity. maraming salamat!
Oo nga. Cge gawan ko Rin Ng slides un..hehehe
@@NoelLaude thank you po sa pag.reply! looking forward po. hehehehe!
@@NoelLaude sir noel, patanong po
with regard sa conductor sizing, ok lang ba mas.malaki ang breaker size compared sa ampacity ng wire?
Hi Sir good day. Tanong lang sir panu naman malaman panu magcompute ng sets of wires na kapag malaking amperes n. Please. Thank you
Hi sir. Pwede po magtanong kung pano naman computin ang total VA nya? Gagamitin po ba ung load amps sa breaker for sizing ng transformer?
Hi sir! May I just ask at segment 5:03, you used an oc protection greater than your calculated value, but according to pec article 4.30.4.2 (c) for rating or setting for indv motor ckt; it says that the protection device should not exceed the value calculated, and the table is also named as 'maximum rating or setting'. Which is correct engr? Because if we were to follow the pec, we would have maybe used 50AT for the ACU? Or maybe it's a 'rule of thumb' for veteran electrical practitioners? Kindly clarify engr, Thank you! :)
Base jn s article n cnabi m.. I follow mo ung table 4.30.4.2..
Dun may type Ng OCPD n gagamitin.. may multiplying factor dun depending s OCPD.. may Isa ako video s sizing ng CB pag individual motor.
Yes po sir napanood ko na din po yun and nakasubscribe po ako pero sabi po kasi sa Art. 4.30.4.2 (c) Rating or Setting: "In accordance with Table 4.30.4.2. A protective device that has a rating or setting NOT exceeding the value calculated according to the values given in Table 4.30.4.2 shall be used" medyo nalito lang ako sir kung dapat ba na nearest lower sa calculated value or nearest higher based dun sa paggamit ng multiplier sa table ng ocpd. In addition pa sir na yung table is named as "Maximum Rating or Setting of Motor Branch-ckt sc and gnd fault protective device", kindly check po sir and thank you sir
Ung sa title Ng table..Tama naman sya kc db ung CB protection sya sa SSC at gnd fault.
Tpos dun sa nearest lower or higher rating Ng CB. Para sakin, designer option n yn eh. Db may standard rating tyo Ng CB. (Art. 2.40), Kung ano ung pinaka malapit n size ng CB base s calculated mo un select mo. Kc may next stage p nman un..dadaan p s protection coordination study ung design m pagdating sa manufacturer ng panels.
@@NoelLaude yes po sir, naisip ko lang po na since 'maximum' yung name ng table 4.30.4.2, perhaps the rating of the ocpd of the motor should not exceed the calculated value using the multiplier found inside the table? Nevertheless, Thank you sir for the response! :) more power to your channel! Found out about this in Mapúa global group :))
@@Frnciss287 thank you din..
Boss ang ganda ng content mo.
Ilang amperes breaker at yung gauge ng wire para sa 5horse power motor?
Sir , p Di pasagot.
Panu kunin Yung OCPD NG ACCU VRF OUTDOOR UNIT??
Sir bakit xlpe cables ang ginamit na cable?,
Tanong k lang sir. So mas mataas po rating ng cb kesa sa wire ampacity pagdating po sa motors? Paano po sa lighting n con. Outlet mas mataas po ba dapat cb kesa wire ampacity or mas mataas po ang wire ampacity kesa sa cb rating po.thanks po sir
Engr. Good pm.. Ask lang po ako sa settings ng Air Circuit Breaker kung ano po yung standard of the following setting:
Example yung total load current ko is 2500 amperes ano po yung size at settings ng Air Circuit Breaker ko?
1. Size ng Air Circuit Breaker
2. Continuous Amps (Ir)
3. Long time delay
4. Short time pick up
5. Short time delay
6. Instantaneous pick up
7. Ground fault pick up
Sana mapansin..more power ..Thanks
Sir 3hp mini ricemil unsang wire gamitun ug breaker
Sir medyo na overlooked ata yung 125% percent .. relative dun sa calculation ng branch circuit conductor dun sa pag apply ng derating factors :)
Ung derating factor sr more on sa saudi inaaply? Dito sa pinas parang wala pa ko na encounter
Meron sa pec ung de-rating boss.. mostly kc jn d nila inaapply, w/c is Mali. Dapat talaga iconsider ung s design
Salamat sir
Malinaw b boss pagka explained ko?
Sir malinaw pina practis ko na malaking tulong sir, sa katulad kung d nka pag aral ng electrical, pero ngun nsa 25 years na ako na electrician sa isa
Ng company sa ngaun inaalagaan kung motor nasa 200 unit at ako narin ang nag rerewind ng mga nasusunog na mga motor, maraming salamat sir.
Pwede k naman mag take Ng REE Kung gusto.
@@NoelLaude sir pano po nakuha ung 43.15 amp ang sakin po ang lumalabas is13amp
Divide mo boss ung 21.12 dun sa (0.89×0.55)
nasa pinas ka ba sir. thanks sa video.
Salamat din boss. Andto p ko sa Saudi.
sir, paano naman mag size ng transformer for motor loads. sana m notice
sir noel san po nakuha yung 0.4 dun sa pagcompute ng MCA
Naka kVA kc tyo sa mga loads.. kaya dinivide ko n ung nominal voltage n 400V sa 1000. Kayak 0.4 n lng un.
Panu engr 3phase motor,3phase load at 1phase load combine load?ty sir
Sir tungkol sa cable ng AHU kailangan ba talaga 4 core o 3 core ok na plus ground?
Pwede Naman kahit ano jn sa 2. Nasa designer naman Yan..or ung availability Ng cable.
@@NoelLaude Pero kung 4C useless n yung isang conductor tama b Sir? Salamat
Normally kung 3phase 400v ung ahu unit m.. 4w + gnd p rin ung cable. Kc may 230v p n components ung panel. I suggest hingi k Ng ahu data s mechanical engineer, para sure ung cable n ilalagay m
@@NoelLaude Ah ok Sir you mean sa mga controls kailangan ng 230V. Ok Sir salamat ng marami 👍
Sir yung tungkol sa BS standard na pinakita mo na table para sa ground conductor di ba Sir base sa table kapag less than 16sq.mm yung cable ang ground conductor ay equal sa size ng phase conductor? So kapag 10sqmm phase conductor ang ground conductor na gagamitin ay 10sq.mm din tama ba Sir? Natanong ko lang Sir kasi napansin ko dun sa schedule of load na pinakita mo Sir sa cable ay mas maliit yung ground conductor na ginamit mo Sir, halimabawa nito 4Cx10mm + 6mm.....
Tama un boss. Hindi ko lng napansin para naedit.. Basta Kung ung BS standard ung gagamitin..follow lng ung nasa table.
Sir baka pwede topic mo ang system grounding saka equioment grounding
Cge boss gawan ko Rin po yn
Ganda ng content mo sir. Paano nga pala kung yung motor is vfd/vsd.. Paano sizing ng circuit protection?
Salamat boss..base sa mga nakitang Kong design ibaiba sizing eh. Nagrange sya Ng 125% to 200%. Kaya nakakalito rin. Hindi ko p rin makita ung standard nya para sana may reference tyo.
@@NoelLaude salamat sir. Actually, di pa rin talaga ako nakka encounter ng standard sizing ng mga vfd/vsd. Mostly, sa mga plano na nakikita ko 200% or 250%. To think soft starter na diba? Kaya na cucurious din ako eh.. Hehe
Sir baka pwede gawa din kayo the same topic pa rin schedule of load pero with single phase load (both continuous & non continuous load). Para naman ma refresh din yung mga katulad ko na di masyado na expose in design. Salamat
@@perciusadlawan5853 actually madalas dabate jn eh..hehehe.. Lalo n sa approval ng drawing.. WLA kcng standard reference. pero dto samin minsan naapproved nman kahit d 250% ung size ng protection..
Sir may tanong lang po..may isang panel board isang 100 amphers tapos yong isang panel 70 amphers...gusto ng owner isang service intrance wire lang po ... Tanong ko po ano po ang sucat ng wire sa entrada po..
Good day, po boss.
Ang main ay ung 100Amp n panel, sub-panel ung 70Amp. Una boss calculate mo po muna kung kaya p ng 100Amp n panel m kung icoconnect m ung 70Amp Sub panel. Possible, baka magpalit k rin ng main breaker pg overload n. Dun magdedepend ung size ng cable m.
sir, napansin ko lang sa sizing ng conductor and breaker, na multiply mo na ng 2.5x for breaker and 1.25 for cable yung highest motor pero sinama mo padin sya sa other motor loads. Summation of AHUs kasi ung ginamit mo. ibig sabihin twice mo nagamit ung highest motor. pls. advise if correct.
Two units ung motor na un..pero Isa lng ung multiply sa 2.5 & 1.25
pag HVAC loads meron yang min. cable ampacity at maximum ocpd size
Engr. May itatanong Lang ako tungkol dito sa motor namin na ang power ay 250kW at 380v/60hz. Ang rating kasi ng fuse sa disconnection is only 530Amp. So far matagal na itong gumagana at ni minsan wala namang problema at Kung babasihan ko ang table from PEC ito ay may current rating na 1424.7 amps based on the mutiplier of 300%. Can you give me further explanation why the German company used only 530Amps instead of 1424.7 or 1600A? Which based on the computation? Thank you.
Good day boss! I assumed 3phase circuit yn motor mo. bale ang calculated current is 446.87 Amp @ 85% pf.. As per PEC and disconnect switch is 1.15% of calculated current, so multiply mo ung 446.87 x 1.15 = 513.9 Amp. So, pasok ung rating ng fuse mo. Sana nakatulong explaination ko. God bless
Sir pasensya na sa mga comment ko Sir, actually gusto ko lang din malinawagan open naman siguro ikaw Sir sa mga ganito. Medyo naguluhan lang ako Sir dun sa approach mo dito tungkol sa derating factor, kasi imbes na lumiit yung value tumaas. Kasi di ba Sir from the from derating dapat bababa, eh from 26.4 A naging 43.15 A kaya medyo nalito ako. Dun sa isang video mo Sir na Lighting at Receptacle Panel maganda nman ang pagkakapaliwanag mo dun Sir, yung ampacity ng cable ang minultiply sa derating factor unlike dito yung computed na min. ampacity dinivide nman sa derating factor. Pero ok naman din Sir nalito lang ako nung una kasi derating pero tumaas kasi naging 43.15A. Isa pa Sir hindi ba dapat yung 26.4A ang gagamitin na value instead na 21.12A? Salamat uli Sir sa mga video.....good job Sir!!!
Ung sa de-rating.. tataas talaga ung min ampacity requirement sa sizing ng cable.. kaya mas malaking size n cable ung pipiliin m para macompensate ung derating factors
May PM ako Engr.
boss paano bha mag compute ng madalian. example yong breaker namin na 200 ampers tapos lagyan sya ng magnitic contactor para madali lang e off . onong size ng magnitic contactor ang gamitin.
200 din
Or bka pwedeng pagingi ung ..masenger account m sir...
Boss pwd ba aq makahingi ng electrical plan design and calculation boss pdf file
Check your email boss
Sir request Short Circuit Cal..tnx
Cge po boss..
Sir good morning. Sir ask ko lang. Napansin ko kasi parang magkaiba yung solution mo sa pagcalculate ng Minimum ampacity ng cable @10:17 sa video na to kaysa sa "Feeder cable and Circuit Breaker Sizing for Lighting & Receptacle Panel (LP Panel) NEC PEC @ 12:16". Also, pwd po bang makahingi ng sample electrical plan design and calculation (for reference use only). Thanks sir. God bless you more.
Kung tinutukoy m boss ung derated values.. magkaiba talaga. Kc iba ung location ng panel nila. Ung s mga motor loads may part Ng cable route n nasa outside building.. ung s lp panel.. ung routing Ng feeder nya nasa loob lng ng building.kaya magkaiba ung derating factors nila.
Yung equation ung napansin ko Sir. sa video mo dto, nagdivide ka. yung sa kabilang video multiply kasama ang runs per phase..Salamat Sir.
Ung s LP kinuha ko ung cable ampacity sa cable catalogue.. tpos multiply s derating factors..
Ung s motor loads ung calculated amp divided nman s derating factors..
Bale two methods ung pinakita ko
@@NoelLaude ah ok.. salamat po ng madami..God bless to you and more power..more videos to come.
ENgr. paano kumuha ng grounding conductor?
BS 7671 ginamit Kong standard.. na explain ko sya s video boss.
@@NoelLaude engr. Pasuyo nmn ng pec 2017 at nec na pdf. Sa email address ko boss. engr.armelovargas@yahoo.com
Maraming salamat engr.
Sir bka pwedeng pahingi... pki send mo sa akin po ung mga pdf sa email ko sir....salamat..po
hindi nasabi yung 0.4 kung saan galing boss?
Converter po boss s 0.4kV.
Engr. tungkol dun sa environmental condition, yung sa binanggit mo na max. and min. ambient temperature, ang max. temp sa sample mo Sir na environment ay 50, tapos may pinakita ka din Sir na table ng description ng cable kung paano ito ininstall tapos may corresponding na derating factor. Napansin ko Sir parang walang relation yung value ng max. ambient temperature dun sa table nagkataon lang na 50 deg C din kasi ang installation ng cable mo Sir ay exposed sa outside air.
Paano ba yun Sir?
Sa PEC ba Sir may table din ng derating factor base sa description ng cable installation? Ang nakita ko lang na table dun Sir ay yung sa ambient temperature tapos column ng temperature rating ng conductor. Tama ba Sir? Mayron din ba Sir na derating factor ng grouping sa PEC?
Ung min & max ambient temperature is base dto sa saudi. May relationship ung max temperature kc ang condition dto pag summer umaabot talaga Ng 50 deg. Kung napansin m, binangit ko n Kung San k nagppraktis, kailangan nating alamin ung min&max ambient temperature. Kc dun tyo magbase Ng derating factors natin.
Merong derating factor s PEC.. check m ung table B 310.15 B 2 11
Engr Noel my pdf file po b kau ng PEC 2017 or NEC. Eto po email ko if ever meron po wlopez314@yahoo.com
Check your email
Check your email
Engr Noel my pdf file po b kau ng PEC 2017 or NEC. Eto po email ko if ever meron po engr.armelovargas@yahoo.com
Check your email boss.. Sayo din ung kay Amir Punzalan?
Engr noel baka pwede din makahingi ng pdf copy ng PEC or NEC rodgieloumendoza@gmail.com
Speak in English also
Sir paano po ba malalaman kung anong size ng conduit ang gagamitin?
May table tyo s PEC boss depende s size ng wire n gagamitin m.. nasa appendix C sya, bandang dulo ng PEC