Measuring Prospective Fault Current (PFC) at the Origin of a Single Phase Supply (Live Test)
ΠΠ΅ΡΠ΅Π³Π»ΡΠ΄ΡΠ² 226,886
ΠΠ΅Π½Ρ ΡΠΎΠΌΡStudent training aid for the live test measuring prospective fault current PFC using a MFT Megger tester. Includes a full demonstration of how to measure PFC current. This test is shown being done under controlled condition in a college workshop. I measure both prospective short circuit current PSCC and prospective earth fault current PEFC and record the highest of the 2 readings.
= π Time Stamps - Cut to the action π ==
00:00 - How to carryout a PFC test
02:21 - Isolating the consumer unit
03:37 - Testing between line and neutral of the incoming supply PSCC
04:27 - Testing between line and the earth bar of the incoming supply PEFC
05:35 - Testing between line on top of my circuit breaker MCB and neutral
06:01 - Testing between line on top of my circuit breaker MCB and earth bar
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E assessments.
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@clivemunns4931 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Great vids, they do just what it says on the tin. Very helpful, thanks guys.
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Much appreciated GSH Electrical
@deanpaterson301 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
All your videos have been instrumental in getting me through my 2365 level 3 - i've no doubt they will be of great value for my 2391-52 next week, thank you Gaz, your time and effort in making these videos is very much appreciated !!!
@johanburger6109 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Great video. Love the attention giving on when to select the 2 hi, 2lo, 3lo setting on the device. Probably the best video I have seen for this so far.
@garethgordon9141 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Comprehensive and clear, thanks for your effort
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanks π
@LindaTheLearner 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Ta Gaz ... for making it all so clear ππ
@avfczoff Π ΡΠΊ ΡΠΎΠΌΡ
Excellent video again Gary ππ»
@johnnevin5706 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Excellent demo right on the money
@jimim8514 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Great video, really appreciated for my studying, thank you
@GSHElectrical 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. So glad I could help. Keep working hard Gaz π
@vernonjones3613 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Very instructive and well presented good job
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
+Vernon Jones Thanks
@mohamedbaghdadi778 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
The nice thing you said in the end of this video. I hope this video some help to be honest it was hugely helpful not some help .thank you so much you are the best teacher I see him ever.
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Massive thanks for the kind words itβs very much appreciated. π I hope this message has been some help π
@sunnyhossain3194 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Awesome Gary
@Rk-w03 3 ΠΌΡΡΡΡΡ ΡΠΎΠΌΡ
Gaz doing these videos through out the night by pendant light!Dedication!
@GSHElectrical 3 ΠΌΡΡΡΡΡ ΡΠΎΠΌΡ
Itβs very much appreciated ππ»
@georgedumitrescu9473 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Spot on and well explained as always. Good work Gary. Going to do my 2391-52 from tomorrow. Wish me luck. I am sure I will remember your videos. Thank you.
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
All the best π¦Ύ
@georgedumitrescu9473 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
I passed the exam. Thank you for your video tutorials.
@craigspacie7048 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Enjoy your videos mate good teacherπ
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
+Craig Spacie Once again thanks for the kind words GSH Electrical
@sparktouch- 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
great explaination and very easily understood....!!! Much Appreciate...!!!!
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanks ππ»
@Ahmed198831 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Always clear explanation thanks
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanks for the support and positive feedback ππ»
@chrissmith7259 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Gary again great video and 'HBSH'.
@gregmartin352 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Great clear and concise videos. With your PFC test on CU main switch at considerably less than the 33Ka of the incomer, under what conditions would you expect there to be any real chance of PFC across breakers to be greater than there 6Ka max? Thanks
@jamesclark925 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Great video its nice to see someone explain the reason for the test and not just the method.
@shuaibsaleem569 Π ΡΠΊ ΡΠΎΠΌΡ
Should've listened more in physics
@Smelch Π ΡΠΊ ΡΠΎΠΌΡ
Whats that meant to mean?
@kobeyossef352 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Good job
@martyclarke969 Π ΡΠΊ ΡΠΎΠΌΡ
Looking nice n relaxed as usual Gary
@peanutpotion 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hi, thanks for the video Iβve got my AM2 soon and itβs going to be 3P+N main switch. Carrying out this test I would crocodile clip onto the earth bar One probe in neutral One probe testing between L1,L2,L3 taking the highest reading and X by 2. Is this correct? Also what setting would it be on as on a single phase board you switch between the 2?
@brahimabdelsadek5815 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
thanx teacher.big respect
@GSHElectrical 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanks for the positive comment itβs much appreciated. Gaz π
@johnnevin5706 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Excellent
@GSHElectrical 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanksπ
@andybrown9178 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Great videos π
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thanks π
@peanutpotion 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
I thought Ze and pfc was done at the supply side of the breaker
@seandempsey9396 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hi Gary can you please tell me how this is done using the kewtech kt62 multifunction tester or the ROBIN kts 1620 MFT as the instruction book says nothing about the two lead high loop test, on the control dial there are two settings, loop 20 ohms 200 ohms and 2000 ohms, psc 200A 2000A and 20ka also how to do Ze Another great video thank you
@barrysharp3559 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Gary, could you tell me why on. TNS system sometimes the Pefc and the Pscc readings are different when both the eart and neutral are essentially the same conductor and both test carried out with bonding in place so same parallel paths etc? Thanks.
@17italyman 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
for the am2s would i need to test PSCC for each breaker or just from the main switch ?
@dwmexe9474 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Thank you so much
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
No problem π
@braisov 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Congratulations for the videos. Please, if you are so kind, two questions: What is the reason for the difference between the measured PFCs of the two switches, being in the same point of the installation? In the case of Line-PE [424-312A] and in the case of Line-Neutral [311-332A]. Would the measures be different with all the charges connected? Thanks
@GSHElectrical 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Normal practice is to measure PFC (PSCC and PEFC) only once. If the reading was less that the PFC of the smallest rating device in this case the circuit breakers 6KA then your sorted. I did it twice as a demonstration as this links to my class lessons on PFC. You have to do both PSCC and PEFC as PEFC picks up the parallel earth paths offered by extraneous conductive part (metal water pipe, metal gas pipe, metal frame of the building etc.) thanks for commenting and watching GSH Electrical
@braisov 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Thanks
@CommonInvesting 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
brilliant videos as always, my tutor is talking about the 3 lead method being the one we should use when testing, is this correct? and what is it
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
ππ»
@gazdkw82 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Is it a requirement of initial verification to test on the load side of the breaker? I thought Ipf was only on the supply side of the main incoming?
@mattsturgess1545 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
I don't think its a requirement, but if you want to do it for peace of mind then by all means do it.
@callumsimpson7483 Π ΡΠΊ ΡΠΎΠΌΡ
Itβs only to test the main fuse if you test on the supply side. If you test on the load side youβll be testing the mcb/rcbo fault current is under 6ka.
@user-vs5fi2vy3h 5 ΠΌΡΡΡΡΡΠ² ΡΠΎΠΌΡ
Hi In psc test why do you put red wire on neutral main isolated why mix the wire. And earth wire which is acting as neutral Went on line. Main idolater Thank you
@JoyyyG 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@6:03 you tested line and neutral on a high reading then switched to low reading when testing live and earth, because there's a rccb in the circuit but @6:03 isn't the rccb in the circuit aswel? Can you explain why High reading when live and neutral then low reading for live and earth please thank you
@RageQuitter1 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
RCDs detect an unbalanced current between the L and N conductors on the outgoing side of the breaker. If the impedance test is done across the L and N terminals there is no imbalance, they are sharing the same amount of current during the test and will not trip. When doing the test between L and E, the RCD detects that the L terminal has current flowing during the test but the N terminal doesnβt, this imbalance will cause it to trip if done on the Hi setting.
@greywolf271 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Can someone advise me about how the instrument gets the current at time 4:33 please ? Are some assumptions made in the calculations ? How can the source impedence be calculated without removing the mains supply voltage ? I read elsewhere that in some instances a standard impedence value is used for the suppliers network and thus the max current is calculated. Is this true ?
@jamblob3208 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
I believe that as the circuit is energised it is a marginal resistance measurement. Thus actual voltage = IΓR or current = VΓ·R
@billyellis1368 Π ΡΠΊ ΡΠΎΠΌΡ
You left the main switch inside the consumer unit on, is this compulsory when doing the first test
@Sergey3023 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Very knowledgeable video, and without any water.. How would you calculate pfc ?Is it I=Uo/Zs ?
@darrenhawkins4504 Π ΡΠΊ ΡΠΎΠΌΡ
Voltage divided by ze
@milesmitchell2025 Π ΡΠΊ ΡΠΎΠΌΡ
On main breaker are u testing the incoming our outgoing supply?
@Davhamish720 Π ΡΠΊ ΡΠΎΠΌΡ
Could you please explain to me why when we do a zs on a circuit on an mcb we get different readings when doing a 2 high and 2 low test? I don't understand why the readings are so different. And surely if you are getting a high test result on the 2 low setting you can put it on 2 high setting and get a much lower reading. If you have any info on the megger high/low settings it would be much appreciated π
@GSHElectrical Π ΡΠΊ ΡΠΎΠΌΡ
Earth Fault Loop Impedance Test - 3 Lead Low or 2 Lead High - Test Explained ukposts.info/have/v-deo/h5GIg3mFhIectH0.html
@kamuts7 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi Gary, how is it gonna clear any faults or short circuits if the current is way below the 6KA or 33KA? I know these are breaking capacity, hence it gives safety to the installation or equipments but how is it gonna rectify the faults? thanks
@GSHElectrical 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. The numbers stated are the maximum break capacity so can clear (handle) faults up to 6KA etc. Thanks for your comment Gaz π
@markdove5906 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
The terminology is confusing it won't clear faults. (They'll be rectified physically) It has to be able to withstand them at maximum so by doing pssc and pfc we know the maximum then we simply look at the Icn of the fuse and we know it can close a circuit if a fault occurs. If for example he found 11ka pfc and only 6ka Icn if a fault occurs they may not isolate the supply.
@kamuts7 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Mark Dove its starting to make sense please can you add more to that?
@Jakee3_ Π ΡΠΊ ΡΠΎΠΌΡ
How come some people use 3 Lead test for this? Does it make a difference? E.G probs on L,N&E doing the PFC test
@154electrician 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
What code would you put on an eicr if you had a pfc of 8.4ka and the mcbs in the consumer unit where rated at 6ka ?
@valyardelean 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
C1
@valyardelean 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
In case of a fault it's going to be a fire..
@LSF315 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi Gary, am struggling to understand this. Your main incoming fuse is rated at 100 amps but youβre mentioning KA. The same with the breaker, this is a 6 amp breaker but youβre now saying itβs 6KA? Can you explain further, please?
@GSHElectrical 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. The breaking capacity is the amount of current under fault conditions the over current protective device (fuse) can handle... so commonly a 6 amp MCB can withstand fault currents up to 6000 amps (6KA). At this value and below the device can break the circuit.... over this value it can say cause a massive arc that leads to a fire or melt across the device and then not disconnect the circuit... all the best and thanks for commenting Gaz
@jamesgledhill9667 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
So 6 amp is just for the overload protection? The KA rating is for the short circuit protection?
@Ethan-hb7wl Π ΡΠΊ ΡΠΎΠΌΡ
In the am2 do you need to do every circuit breakers or just the one
@GSHElectrical Π ΡΠΊ ΡΠΎΠΌΡ
LIVE Testing on a 3 Phase Dis-Board - External Earth Fault Loop Impedance Ze, PEFC, PSCC AM2 & AM2S ukposts.info/have/v-deo/gZWIo4KMgIGmq6s.html
@benellis4681 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
I carry out this test with a similar tester . But I never changed the leads over( l-n& l-pe)would this have any effect on the test results ? Also , should the fault current reading between the tails be greater than the rating (eg 100amp)
@benellis4681 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Also haha ,,,,. Am I correct in saying that the fault conditions are what could occur between the fault happening and the main fuse blowing ? Thanks.
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. No worries on the test leads. The fault current (PFC) at the tails can be up to 30kA the PFC rating of the 100amp cutout fuse is either on it or look in BS7671. Itβs the fault current it can clear not the load current which as a rule of thumb is 1.5 Times itβs rated value so 100 amp fuse could carry up to 150 amps for a short period of time. Hope this helps GSH Electrical
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Yes
@benellis4681 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
GSH Electrical itβs one thing doing the simple test but another understanding it fully . Thanks
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Yes. I hope my videos help in some small way. Thanks Gaz
@andrewhamilton2655 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Is the measurement of each individual circuit PSC recorded on the test sheet or is it the PSC on the side of the breaker? i.e. 6KA
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. The kA rating is either on the side or front of circuit breakers. The measurement is only done once above a (any) breaker as shown in the video as this will be the same reading (PFC) for all of them. Hope this help and all the best GSH Electrical
@andrewhamilton2655 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Sorry, what I meant was that in the box on the test sheet asking for the value of KA, do we wright in the value written on the side of the breaker, or the value we have measured? Cheers Andy
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Yes the value on the device thanks Gaz
@kamuts7 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
So how much current to flow for the RCD to trip? More than 6k amp?
@Masteranddisaster13 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
brad Rhed 30mA
@Rossisearle Π ΡΠΊ ΡΠΎΠΌΡ
Hello Gary at 1:42 where would i find this table? WR or Onsite?
@Jo3yW Π ΡΠΊ ΡΠΎΠΌΡ
GN3 Table 2.16 p91
@falconryforever 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Just to clarify, we dont measure the fault current, we measure resistance and the tester auto calculates it and shows it as result. You dont send 4-5-600A trough your tester.
@greywolf271 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
The test leads would fry first
@iraqviva7670 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
im using fluke 1652B will i select Zi loop Hi current or Zi loop no trip thanks
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
High current
@iraqviva7670 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@GSHElectrical wow man supper respond thank a lot. you guys are stars
@antonwillis896 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hi, just a quick one Iβm slightly confused with this test and Iβve my am2 on Monday. Whatβs confusing me is Iβve seen/heard that you have to times your highest result by x2 and thatβs your ipf your record down
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Testing for External Earth Fault Loop Impedance (Ze) When You Have a Main Earthing Terminal (MET) ukposts.info/have/v-deo/pqpkp5mKip1ku4k.html
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Live Testing AM2 & AM2S - External Earth Fault Loop Impedance Ze, PEFC, PSCC on a 3 Phase Dis-Board ukposts.info/have/v-deo/gZWIo4KMgIGmq6s.html
@GSHElectrical 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hope these help ππ»
@markgilder7757 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Reg 542-04-02 "The means os earthing must be disconnected from the installation earthed equipotential bonding for the duration of the test to remove parallel paths. This is to prove that the installation has a main earth. IET. Guidance note 3
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Correct and I disconnect from the MET the protective bonding conductor disconnecting it from the main earthing conductor in this video. Thanks for watching GSH Electrical
@skamuk1 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
For Ze testing only, you need to reinstate all bonding connections before carrying out PFC testing.
@peanutpotion 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
You only disconnect the main earthing conductor for Ze test, you need to reconnect the main earth for PFC
@jamblob3208 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@skamuk1 would that be not for the other tests mentioned, not the max PFC demonstrated here? I didn't see mention of the installation earthing being disconnected but he says in this reply that he did that though which is confusing me as it doesn't look disconnected.
@zedzed1046 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
On the loop switch there is a LL, what would that be used for.
@Jo3yW Π ΡΠΊ ΡΠΎΠΌΡ
Testing between phases.
@ashhowey5249 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
That bending radius on the main swa... π
@michaelboyes4948 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Looks like copex not swa
@ashhowey5249 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@michaelboyes4948 Oh yeah, good point ha ha ha.
@zamanraja9531 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Can anyone explain In a nutshell please what the connection is between Zs, PFC, PEFC & PSCC
@tomaustin8943 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Ohm's law
@zamanraja9531 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@tomaustin8943 no as in like in terms of measurement and which ones u need to record on the EICR
@tomaustin8943 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@zamanraja9531 so prospective fault current (ipf) is the highest of PEFC and PSCC. This is recorded in the nature of supply parameters. Zs ie (R1+R2) + Ze is recorded on the schedule of test results.
@zamanraja9531 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@tomaustin8943 omdss u made it so simple thank you so much !!!
@tomaustin8943 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@zamanraja9531 no bother ;)
@ningis21 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi...wWhat do you have to say regarding these two comments I read on another channel...where the tester / instructor stated the fault currents wer 370 and 350 A for PFC PSCC 1. The breaking capacity of the main fuse will need to be lower than the PFC The second commentor agreed..... 2.Exactly! How is it that having CBs of 6,000 A breaking capacity will protect a circuit with both earth fault and short circuit PSFC and PSCC of 370 A and 350A, respectively?! The whole purpose of a protective devise is to trip before a circuit or any relevant point of the electrical installation reaches its maxumum PSCC or PFC!!! If that installation has in place those protective devises then surely the PFC and the PSCC are higher than 6,000 A. I seriously suggest this video should be withdrawn. It represents a hazard in itself! It will certainly confuse the inexperienced student. Your comment would be appreciated... I think the commentors have mis-understood which part of BS7671 we are compairing...and this may need explaining...by someone somewhere. .
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Thanks for the detailed message. The information you have provided me is worrying but I havenβt seen the video yet. I am not sure how you can go about having a UKposts video removed it maybe worth highlighting these points to the channel that produced the video. Many thanks for your time GSH Electrical
@ningis21 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
The video seems fine as he did the same as yourself tested the board to ensure the fuses/circuit breakers were able to withstand the potential fault currents. It was the commentators who had it wrong....but they did raise an interesting point...in that you would expect the fuse or circuit breaker to trip with the lowest fault current...in order to save the installation.....seems odd to have a large fault current circulating and the prospective faults becomming actual faults and no breaker has tripped....was their slant on things, confusing the actual tripping current eg, 30mA or 150mA, of the device with it's actual handling capacity.
@GSHElectrical 6 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Hi. Thanks for coming back itβs lovely to see your taking things so seriously. Keep watching and asking your questions GSH Electrical
@highhurstfarmandholidaycot526 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hi Gary Can I ask a question. Why have not locked off the main switch before taking the cover off and why do you need to do PFC test for each circuit rather than just at the input to the main switch. GN3 and both Napit/niece guides always show locked off powered down CUs whilst doing this test. If I had done this during assessment I would have been failed.
@MB-iw6gu 4 ΠΌΡΡΡΡΡ ΡΠΎΠΌΡ
You will never get an answer from him because in this industry no one knows what to do . I had once two different assessment within couple of months and both assessors were saying something else.
@tspirit99 5 ΡΠΎΠΊΡΠ² ΡΠΎΠΌΡ
Mate i love your videos but why are your arms sticking out? you been making those gains at the gym? :D
@geraldelwood9660 2 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Why would you get a significantly higher Pfc L to PE vs L to N. Since you are testing a TNCS supply you would expect the same result since parallel paths are open to both tests through the MET. Or a slightly higher for Pfc might be expected for L to N, since the L tail is 25mm as opposed to 16mm earth tail. Also why test Pfc at top of breaker, as it cannot be higher than Pfc at main switch. This just encourages learners to follow a list of instructions with no awareness of what they are physically testing nor the meaning of what the results actually tell them.
@faithful5475 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
At 4.48 that was dangerous, you almost touch the live main incoming, main cut off switch is also on Becareful, love your videos keep it up
@randomteddy9938 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
who wired that DB dear god
@GSHElectrical 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Learners have the conductors in and out of this board every day... I didnβt have time at 7am when shooting the video to sort them out. All the best Gaz
@jameshansing5396 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Surely it's a bit dodgy having a Trade Skills for U advent just before a video by GSH Electrical???????
@GSHElectrical 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
James Hansing thatβs a youtube thing not a GSH thing
@jameshansing5396 3 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
@@GSHElectrical Sorry yes, I didn't think it was you guys and I suppose UKposts possibly can't tell certain advertisers they CAN'T have certain spots but it just seemed a little like letting a rival try to cash in on your hard work and success. Just seemed a bit of a "dick move" by UKposts and indeed TS4U....
@lesharapi9617 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hard to understand
@GSHElectrical 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
Hi. Sorry. Gaz
@leebrown3895 4 ΡΠΎΠΊΠΈ ΡΠΎΠΌΡ
It would have been much better if you shown where on the sheets you put the results.
External Earth Fault Loop Impedance on a TN-C-S Earthing Arrangement Measuring Ze in Ohms (max 0.35)
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