Electronics > Beginners
Lab with NO grd, what about gear?
FriedMule:
Since that all gear do not get grounded, why isolate more by using a isolation transformer?
Would it not be enough if I connected all the gear to the same outlet?
By the way, there are no ground rod at all and we have properly te stupdst "safety"! It is posible to put the plug in the socket in two ways, so there about no way to know if phase or neutral is getting the letal power!
lypse:
Hi FriedMule,
If you cannot use some pipework for the PE connection, consider using a handheld oscilloscope (isolated channels) and skip the anti static mat.. in short, eliminate ways you could shock yourself? :)
/Alex
0xdeadbeef:
--- Quote from: FriedMule on October 15, 2018, 11:04:43 am ---By the way, there are no ground rod at all and we have properly te stupdst "safety"! It is posible to put the plug in the socket in two ways, so there about no way to know if phase or neutral is getting the letal power!
--- End quote ---
IMHO that's not a safety concern. It's better to always expect voltage on both, line and neutral. In countries were neutral and line have a specific position on the plug/socket, the installation can still be screwed up and you die on the assumption it wasn't.
Ian.M:
The isolation transformer controls where the ground leakage currents and any ground fault currents return to, so its necessary if you can't put in an adequate grounding conductor and ground rod(s) for a TT system. It also doesn't care which way round Line and Neutral are on its primary or even if the primary is fed between two phases of a three phase supply as long as the voltage is correct, and if wired as described will provide a clear Neutral on the secondary side. N.B if wired as described it doesn't provide any 'isolation' for working on equipment, its output should be treated with the same respect as any other mains supply.
Due to its surface resistivity and the 1 Meg resistor in its grounding lead, an antistatic mat is not a shock hazard. However in the absence of a proper ground, you need an equipotential bonding zone, so there is a path for charge equalisation, or even for charge to leak away to true ground via a higher impedance path than would be acceptable for safety grounding if the equipotental bond ties in water pipes, rebar or other structural metalwork.
FriedMule:
1) Am I understanding correct that if I connect all the lab gear to an isolation transformer, I am less in danger?
2) it is a good idea to take a wire and connect all the grounds and antistatic things together even if that wire never are in connection with real ground but only are connecting the gear?
3) would a cheap max 500W isolation transformer be ok? (https://www.amazon.de/gp/product/B0067K0ESA/ref=ox_sc_act_title_1?smid=A3JWKAKR8XB7XF&psc=1)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version