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ELECTRICAL TAFE theory
เข้าร่วมเมื่อ 29 มี.ค. 2014
วีดีโอ
LET PAPER overload and short-circuit calculations
มุมมอง 1712 หลายเดือนก่อน
Short video on how to work out the calculations and how to set them out to get full marks
LET cable selection based on a maximum demand with deratings
มุมมอง 3242 หลายเดือนก่อน
LET cable selection based on a maximum demand with deratings
LET cable selection based on cable size
มุมมอง 2722 หลายเดือนก่อน
this video I made to show the difference between maximum demand and size of cable in a in a cable selection. question for the LET just to give you that difference in what you need to do
MAXIMUM DEMAND TABLE C1 EXPLAINED STEP BY STEP part 1
มุมมอง 1.1K3 หลายเดือนก่อน
table C1 explains step by step with worked examples to show you how it works and explain how you would get your answer. this is part one
cable selection 3008 index B1 and tables explained
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you sweetie how you guys show you how to use cable selection in 3008 book and shows you how the tables are broken down
OCB explained part 2
มุมมอง 4042 ปีที่แล้ว
simple description of how the control wiring works and how the acb fits into the rack and does it's job
OCB explained compared to a contactor 22 000 v
มุมมอง 2692 ปีที่แล้ว
basic description of a OCB oil circuit breaker describe compared to contactor
TEST OF ELECTRICAL INSTALLATION CHISHOLM
มุมมอง 8K2 ปีที่แล้ว
Testing of electrical installation at Chisholm LET room
dc circuits explained no 6
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we look how break down circuit and look steps required to get outcomes
AC 3 Phase Motor Basics Simplified
มุมมอง 4692 ปีที่แล้ว
A simplified explanation of a 3 phase motor. Enquire within for electrical tutoring.
g109a control box with multi stage start up
มุมมอง 3003 ปีที่แล้ว
g109a control box with multi stage start up
LET voltage drop Explained one of questions
มุมมอง 6K3 ปีที่แล้ว
LET voltage drop Explained one of questions
overload and short circuit calculation LET exam fault current
มุมมอง 4.4K3 ปีที่แล้ว
overload and short circuit calculation LET exam fault current
3008 tables 22 and 25 /1 and 25/2 how they work
มุมมอง 7924 ปีที่แล้ว
3008 tables 22 and 25 /1 and 25/2 how they work
The main earth neutral or m.e.n. explained
มุมมอง 24K4 ปีที่แล้ว
The main earth neutral or m.e.n. explained
Thanks mate
please can you send me your email address. I want to discuss something with you
Amazing video! I've sent you an invite on LinkedIn, because im looking for some exercises about Maximum demand, CCC and voltage drop, this is because I'm a junior Electrical Engineer and I'm looking for more expircience in the construction. Can we talk ? Im will appreciate a lot! You are doing an amazing job!
You know the subject obviously. But what a lot of waffle, not very well delivered.
Very nice, maximum demand is the total amount of power required on the sub board as per AS3000, circuit breakers are there for cable circuit protection in case of an overload or a short circuit on the line. Also I believe there is half a module space required between the main switch and the first circuit breaker incase of sealing purposes.
cheers for vid, makes sense
Cinder block or besser or millblocks
Resistivity
Should the MEN link be thick, least resistance or thinner making a higher resistance? I'm thinking thicker so the current can pass through quicker and the resistance of the other metals in the housing will allow for that 5 or 10 ms delay. Am I correct?
that depends on on the wiring rules. A dummy value is having it the same csa as the neutral conductor, but there are variations to consider in varying the size. theres also a rule stating a conductive enclosure needs bonding equivalent to that of the neutral conductor. Imagine seeing a 16mm2 bond on a domestic board wtf hahah. But like i said there are variations to factor in that can either increase that size or decrease.
Did you understand what he was getting at?
I found it confusing as well
You would only have the earth to neutral link attached on your main board though. Not on any sub boards. correct?
I just moved to Australia and I noticed that the diversity factors between each apartments, at the consumer level, at the transformers level, between floors,... are not considered? or probably these tables are already diversified max demand? appreciate if you have an answer. As this will reduce heavily the MD for each assessment.
Internationally we refer to the Standard Handbook for Electrical engineers - Mcgraw Hill
Thank you. Very easy to understand info. But i have a further question. In an off grid system (solar with lightning protection+inverter+generator) where does this link go? Do they all run to the same earth? Is there a way to separate the earths so that lightning or static electricity does not upset the rcd function? Is that even an issue? There is a real lack of info on this subject. Maybe im just looking in the wrong place?
Why is it “multiple” why can you only have one
It’s called Multiple Earthed Neutral because the (P.E.N) Neutral is Earthed at the Installation (Main SwitchBoard), and throughout the distribution system (Poles and Transformers)
Thanks for the video, bery helpful.
Thanks for explanation.
This series parallel circuit?
15years ago my TAFE lecture did not explain it like this at all. Such a shame this part of an apprentice the lecture brushed over this swiftly. Your explanation shows how important it is and all under 30mins which was also very clear and precise. Thanks 🙏
Will it be logical and Safe to use Table C9 to separate the loads per Circuit Breaker first and then Calculate the Maximum Demand accordingly if I'm sizing a Maximum Demand for a Final Subcircuit?
Hi Sir, If I have 2 x 20Amps + 2 x 32Amps 3-phase socket outlets in a Factory, how do I calculate the maximum demand. Does it fall under load group b(iii)?
hello would i be able to get some assistance with a certain max demand question i have regarding single phase lighting circuit on a 3 phase switch board if possible, could i please email you?
U used 5 units as example to explain column four....
Very helpful, Steve.
During earth fault condition if nuetral is connected to earthing bar would the current not be of shock harzad
Ummm m.e.n doesn’t stand for main earth neutral 🤪
I don’t understand, if I’m installing 3 extra 10Amp double gpos in a room of a domestic house do I have to calculate maximum demand?
Hi sir so I came across this non- domestic max/demand load. (1) 30 - 2×36W fluorescent fittings @0.38A each. I know it will be in load group (a) but the calculation part I'm a little bit confuse. If you could at least explain what they meant. Thankyou
Thanks for sharing this... really appreciate it mate.....
"Do you understand what I'm getting at"?
Can you steady the fucking camera and stop shaking it please
Take a shot everytime you hear "you understand what I'm getting at? "
Hi, Pls help me with this. When it says 2 core cable, is it active and neutral? Thanks Sir.
i stumbled across your content for the LET a couple of weeks ago, and all i can say is thank you!, did it today and passed!
I am shitting bricks mate. The stress is real... I think I may have developed some form of depression.
@@stonedsloth6367 Keep studying man, took me a while to understand some things, but in the end the exams were not so bad and ended up doing really well
hmmm not the best at explaining
This video helped me a lot today, thanks a lot mate - appreciate the effort!
🎉🎉🎉🎉🎉🎉😢🎉
Nice 🎉
thanks alot
Found your channel last week and its the most informative and clear channel ive found in prep for my A grade tests. In your latest video on Wiring rule questions I can't see a link, I'm not sure if it is only for your students but would love to have access to it, I am at swinburne and they dont and explain anything as clear as you do.
When using RCBO for final sub-circuits, do we connect M.E.N in the sub-board?
Thank you So much Sir .
The MEN (Multiple Earthed Neutral)
man eats nuts
thanks for the videos mate. really helps a lot cheers.
Are the cable impedance values for the line and neutral ? ie Do they allow for the length of the neutral return path also ? Is the short circuit value for phase to phase short which is the worst case scenario i assume. ?
The fault value is only for active only to earth value
I’ve been in the trade a long time, this is the easiest to understand explanation I have seen. Well done
if the MEN Link is missing is it a serious problem
I'm doing a generator connection to my house, and as I'm sure you know the neutral now also goes through the changeover switch (been a few years since I've done one). The question is, do I need a earth-neutral connection at the generator inlet as I'll obviously be losing the men connection when switched over to the generator?
Only one complaint; please use something pointier as a pointer 😁
Hey thanks for the videos . Quick question . When doing cals for new mains to a domestic dwelling do I use single phase 230v or 3 phase400v values? It’s obviously an unbalanced load because all apliances in house are single phase ?