G
goodconnection
I'm taking C&G 2377 22 next year probably around May ish My hunch is that asking some qualified electricians a few somewhat daft questions may give me a better idea of what my strengths and weaknesses are with regard to my current understanding of the In-service Inspection and Testing of Electrical Equipment. I'm qualified in IT HNC level so maybe there is some hope eh !
I'd like to do a good job and have enough background knowledge to be in a position to fully understand the results obtained from all the tests carried out and if necessary advice duty holders if a qualified electrical engineer is required to investigate further. I hope you get the general gist of this ....
I currently have a Metrel gamma pat battery powered device and as such lack the ability to carry out certain tests.
my purpose in buying one has been to observe the functions of the device it's features how it presents it's results and the opportunity to practice carrying out basic tests in the proscribed manner on pieces of my own equipment.
Note to moderators: please move the posting to wherever you feel this belongs in the forums ....
Ok this is the end of my preamble and up next is question 1.
Laptop Power Supplies .... how to keep end users safe !
I do IT and have seen hundreds of the blessed things and to be honest many get bashed about and lots seem to malfunction.
In the UK we appear to have two versions
type a class1 device enabled with a protective earth conductor and a class 1 3 core cord set onto a BS fused 3 pin Fused Plug
type b class 2 device enabled with double insulation live/neutral input and a class 2 core cord onto a 3 pin BS Fused Plug
similar sort of arrangements for some peripherals including printers ....
does class 1 AC 2 DC power supply = Sensitive Device = 100 mA / 200mA Earth Bond /Continuity test parameter ?
but how to check it when there in NO obvious means to attach the probe . only metal surface point available is the negative line of the dc output terminal that supplies the laptop.
A good visual check will obviously pick up signs of damage to the moulded case of the Power supply and any chemical invasion or otherwise signs of trouble eg melted / smelly polymer/ overheating the cord set is treated as a class 3 device and tested as such.
I suppose the first thing to be done at the start of test would be to deduce if the equipment and the environment that it was being used in and the purpose of use was suitable from the view of safety ....
are there any circumstances where the PS can output high voltages through the dc line ? and if so what would be the cause ?
Please feel free to comment and throw in your views and experiences of dealing with such matters in your course of business I'm grateful to the forum for providing this facility and hope that actually making a connection with those with far greater knowledge and abilities will help me in my learning process.
I'd like to do a good job and have enough background knowledge to be in a position to fully understand the results obtained from all the tests carried out and if necessary advice duty holders if a qualified electrical engineer is required to investigate further. I hope you get the general gist of this ....
I currently have a Metrel gamma pat battery powered device and as such lack the ability to carry out certain tests.
my purpose in buying one has been to observe the functions of the device it's features how it presents it's results and the opportunity to practice carrying out basic tests in the proscribed manner on pieces of my own equipment.
Note to moderators: please move the posting to wherever you feel this belongs in the forums ....
Ok this is the end of my preamble and up next is question 1.
Laptop Power Supplies .... how to keep end users safe !
I do IT and have seen hundreds of the blessed things and to be honest many get bashed about and lots seem to malfunction.
In the UK we appear to have two versions
type a class1 device enabled with a protective earth conductor and a class 1 3 core cord set onto a BS fused 3 pin Fused Plug
type b class 2 device enabled with double insulation live/neutral input and a class 2 core cord onto a 3 pin BS Fused Plug
similar sort of arrangements for some peripherals including printers ....
does class 1 AC 2 DC power supply = Sensitive Device = 100 mA / 200mA Earth Bond /Continuity test parameter ?
but how to check it when there in NO obvious means to attach the probe . only metal surface point available is the negative line of the dc output terminal that supplies the laptop.
A good visual check will obviously pick up signs of damage to the moulded case of the Power supply and any chemical invasion or otherwise signs of trouble eg melted / smelly polymer/ overheating the cord set is treated as a class 3 device and tested as such.
I suppose the first thing to be done at the start of test would be to deduce if the equipment and the environment that it was being used in and the purpose of use was suitable from the view of safety ....
are there any circumstances where the PS can output high voltages through the dc line ? and if so what would be the cause ?
Please feel free to comment and throw in your views and experiences of dealing with such matters in your course of business I'm grateful to the forum for providing this facility and hope that actually making a connection with those with far greater knowledge and abilities will help me in my learning process.