Phase rotation and PSC

[mikilianis]

Hi You state "the motors are checked with a phase rotation meter before connecting the cable direction is checked then only is the cable connected and switched on." may I ask how would one check a motor with a phase rotation meter I know one can check the phase rotation I am not being sarcastic I genuinly havwe a desire to know as I to work on machines where ddirection is detremental.
Mike

[murdock]

most of the machines with on board computors will signal a problem if the phase direction is incorrect...the problem is with motors for conveyers and pumps...if you run the motor the wrong way on start up there are serious implications...always keep your phases clockwise or anti clockwise whatever suits you...but in saying that i have found most machines i have worked on use a clockwise direction...so i choose to make all my installations clockwise...some machines have 10 or 20 motors on it imagine changing trying to figue out what is going on after a few clowns have worked on it...throughout a system makes it good practise...and i must stress again sabs electrical codes are there as guide lines...installing equipment straight...keeping direction clockwise red/white/blue...ABC...UVW just makes life a whole lot easier...my problem is i dont just sign over COCs i actually work in the industry...i design build and automate electrical installation and control systems...so i have a set standard to work to...it makes my life a whole easier...in fact i believe as mentioned before...this COC is a money making racket unless improved to a point that it is as many pages as required to carry out a thorough inspection report it should be scrapped...at present it is tooo vague and too easy to miss interpret...i see it on a daily basis...people just fill in what they assume the readings should be...as far as i am concerned...no coc should be issued without a full printed out test result from a megger or fluke multi function tester...of every single test carried out...and the inspection report fault list should also be attached to the COC...i feel like making a copy of a COC filled in a month ago by a company which i feel is illegal...it doesnt have the persons accreditation numbers etc...it isnt filled in correctly...results written on the COC are not even correct on it and what so scary is the person is a well known company who has been around as long as i have...and now the fun begins because my customer took my advice and once the sale was approved and the coc was been issued...we can now take action before tha transfer occurs...so it has been put on hold until all these issue are resolved...leaving my customer in a far better position than if the transfer had already gone thru...he has now decided to get me to carry out an inspection report...and the beuty about it is we dont need lawyers...or AIAs or DOL ...or anyone just the customer to be satisfied with what he gona invest the rest of his life in...and if he he not happy with the result just walk away and find a place he is satisfied with.



just 2 of the many testers available...


http://www.aemc.com/products/pdf/2121.04.pdf

http://www.megger.com/us/products/Pr...17&Description

[murdock]

just a reminder when using a phase rotation meter or any meter for that matter...not for sensitive viewers and if you are a young up and coming electrician i wouldnt advise you to watch this is your wife or girlfriend is close by...not because there are any dirty pics just because it will cause her to stress when you head out in the morning to work...i noticed they have put the music clip back on because apparently it has a copy right.


i show this video to my staff or when new people start or sub contract and when i catch them getting tooo clever...just to remind them of the implications of their actions.

YouTube- Donnie's Accident

[Sparks]

Hi guys, I have been a bit busy lately so have not been able to comment sooner. From the start of this thread I have been waiting to see the answer and am a bit disappointed it has not come yet. The answer is: The COC must reflect your findings at the time of the inspection. Whether it be clockwise or anti-clockwise. Within the same district it should be constant. Your PSC can only be marked "from supplier" if you get the information from them. Without testing and knowing for sure what it is, or calculating it, how do you know your CB's are of the correct rating as declared later in the COC?
I agree with you about the COC to a large extent Murdock. It will remain a money making racket until the industry is cleaned up and policed properly. Before that can happen there is still a lot of work to be done in the industry and on the COC.

[murdock]

you need to be careful what you read on the internet...and also need to adhere to the local suppliers bylaws when filling out the coc...in different parts of the country or even within a province the coc would require a different answer or method in which you get the result...a good example is KZN...where you have the durban electricity department and eskom.