15
votes
Accepted
Should the threaded insert for an M.2 mounting screw be grounded?
It appears to be part of the M.2 requirements that the mounting screw is grounded:
2.5.2. Electrical Ground Path
The module Stand-off and mounting screw also serve as part of the module Electrical ...
- 12.5k
8
votes
Why are three pronged plugs more preferred than two pronged ones?
The earth connection (3rd prong) keeps you from being electrocuted if an electric appliance becomes damaged and then its metal chassis is accidently connected to the live electrical wire, and you ...
- 3,980
6
votes
Accepted
Why are three pronged plugs more preferred than two pronged ones?
No, incorrect. The ground wire is mainly used for safety, to ground a metal case to protect from electrocution should the case become live with mains due to a malfunction in a device, but it is also ...
- 131k
4
votes
PCB inside metal chassis. Is chassis ground required?
chassis is not used for electrical purposes elsewhere
Not relevant
safety
Not applicable - only relevant when dealing with safety grounds.
common mode noise
emc
The general rule of thumb when it ...
- 18.1k
2
votes
Zener diode for overvoltage protection and earthing
First, that's not the symbol for a Zener diode. That may be the fault of your layout software.
For a Zener to protect the IC it would go between the pin and ground, with the cathode (line end) to the ...
- 18k
2
votes
PCB inside metal chassis. Is chassis ground required?
I would at the very least wire bypass capacitor(s) to it, if not hard-ground it.
The adapter will require a REINFORCED type isolation rating, or if the panel/circuit can be earthed, BASIC or better.
...
- 24.4k
1
vote
Zener diode for overvoltage protection and earthing
Just cut the connection upward from "1" on the Zener to break the loop. You also need to make sure that both resistor and diode are good for the resulting current from applying 230V if that ...
- 2,664
1
vote
Can I use the concentric conductor of NYCW 95/50 as a ground wire?
This is how a TN-S earthing system is wired: -
Image from TNS Earthing System: A Useful Guide.
Must one buy a separate ground cable
If you don't have an earth wire it won't conform to the ...
- 437k
1
vote
Do neutral wires go back to transformer via ground?
It is not true that utility power is fed to the consumer through live wires alone, with earth / ground serving as the neutral.
Here's a typical schematic for a three-phase system.
The neutral wire, ...
- 16.4k
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