H&S precautions using a high voltage electronics circuit
A rather vague definition.
What constitutes High Voltage?
What constitutes Electronics?
To a "light current" guy like my self, high voltage is something which will hurt you, whereas the "power" guys definition may be a voltage greater than 1000 volts.
Similarly, to me electronics is something with transistors and ICs, to the power guy it may be BIG thyristors, triacs and diodes.
A couple of different examples from my own experience:
In the workshop repairing an oscilloscope with CRT.
Can the workbench support the weight of the equipment under test (EUT) and the associated test equipment?
Can anything fall off the bench?
Can the EUT be safely moved for access to the various internal circuits?
Do I have enough room to work safely and move away from the bench if things go wrong?
If things go wrong, how do I switch off the power to the bench?
Where are the high voltages in the EUT?
The mains power
The high voltages ( say +/- 200 to 300 volts)
The EHT for the PDA (say 10 to 15kV)
Are the test equipments suitable for the voltages I am about to measure?
Is the service manual/schematic for the EUT available?
At a process plant/oil refinery/offshore oil production platform, working inside a cabinet of control equipment.
Do I have authority to work on this?
Are the Permits to Work open?
What can happen if I do something wrong?
Will the process stop?
Will there be a release of hydrocarbons or chemicals?
Will some machinery start unexpectedly?
Am I working in the correct cabinet?
Where is the mains supply, how do I isolate it if necessary?
I am just working on the low voltage (24volt) circuits, but is there a possibility that I can trip the 24v power supplies?
Not exhaustive lists, but these are the things which have affected me in the past.
From some of the comment by the OP about his instructor, I cannot help but think that this is a case of the blind leading the blind.
Has the instructor ever done this stuff for real, or is he just a "gob on a stick" ?
JimB