- Reaction score
- 88
Just finished written and online 2395. Passed online with 90%, found the written pretty hard. Anyone else done it today.
Discuss Today's 2395 in the Electrician Courses : Electrical Quals area at ElectriciansForums.net
just done the written as a re sit. i had to put in loads of revision so hopefully went well? had a couple of "brain farts" but after checking my notes i'm ok. thought i new enough to get away with just a little revision last time, that cost me £120!!
best bit of advice to anyone else doing it, download and read the examiners report its available to all and gives solid advice.
How did you work out volt drop question ?
Whats a 1.2 correction factor when calculating volt drop ?
Can anyone post the question up ?
I take it from some of the repies that you have a value for either Rn or R1 doubled it and multiplied by the protetive device to get your answers!
I very much doubt that the question would be asking for correction factors in relation to a VD question!
IMO you would be using them to calculate the ZS of a cct making sure it would comply but you would need lots of info in the question along with tables from the OSG or regs book along with the ambient temperture of the room.
The rule of thumb method is often asked for when checking to see if a cct will comply but that has nothing to do with VD !
If you were given a value of either Rn or R1 and the size of MCB it would be a case of a quick calculation Rn x 2 x MCB (size) = ?? and as you know you VD % for the circuit ( 3 or 5% ) and you know the Uo say (230 V ) the answer you get will either comply or not!
I can't remember whether the qu mentioned if 0.23 was the measured live conductors resistance (ie R1+RN). I myself, didn't use any correction factors, but can see why people have. I thought the that 1.2 correction factor was for correcting the R1+R2 part of the Zs=Ze+(R1+R2) equation, as its carried out as a dead test, and therefore the conductors aren't at operating temperature? But thinking about it... The same logic could be applied to an R1+RN test?
Reply to Today's 2395 in the Electrician Courses : Electrical Quals area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.