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  1. M

    What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth)

    Hi I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors. I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit...
  2. N

    Correct grounding of metal junction box w/splices for 3 circuits

    I have 3 circuits (microwave, disposal, and dishwasher) entering a metal box where the THHN wire will be spliced to Romex. I spent half an hour reading 2020 NEC Article 250 but didn't see multiple circuits specifically addressed. To ground the box do I just need to pigtail off of one circuit's...
  3. S

    Grounding issue - getting small shocks

    This is proper first world problem but i hope someone can shed some light on this. I live on the sixth floor of an apartment block and have an outdoor terrace with concrete paving stones. I have put some fake grass on top with some polystone planters. I keep getting small shocks when touching...
  4. D

    Isolating grounds in Solar installation

    I have 400 Amp service split into two 200 Amp panels. I’m converting one to a protected loads panel as part of a PV solar system with battery backup. Since ground is tied to neutral I want to isolate the neutral and ground buses of one panel from the other to make sure no current flows to the...
  5. C

    Earthing neutral in a multi source system

    This has me clueless. Why must the neutral be unearthed at the transformer and generator and only allowed earthing at the switch-gear? I can't see any reason because the neutral will normally not be carrying any current and thus no parallel current paths would form.
  6. B

    Updating 1982 Pre-fab building with fuses & no grounding

    Hello, I have a flat/apartment in a building as described in the subject. I am wondering what to do about the current and additional outlets to have them be safe for kids. The options: -Replace fuse box with circuit breakers -Run ground wiring and connect it to neutral at the junction boxes...
  7. F

    How to wire for "electrically sensitive" people

    Hey everyone, I believe I may be one of the crazy people who thinks they are "electrically sensitive"... I hate that I am that guy, but this is kind of where I find myself. I'm convinced that the farther from all electrical stuff I sleep, the better I sleep, and I've kind of gotten obsessed...
  8. K

    Grounding a 1500 watt inverter

    I'll cut to the chase - bought a 1500 watt pure sine wave inverter, which has a small screw and a nut coming out of the chassis labeled "ground", and they provide an associated 12 inch wire, ring at one end, that I can of course attach and tighten down to this exterior screw. The other end of...
  9. K

    Disconnect, grounding and mechanical protection requirements when bringing power to a chicken coop...

    Hi, I want to bring 2 x 20A (@120V) to a chicken coop. It will be powered from my garage panel which will require 140' of cable. 85' in the garage along 2 walls, and 55' buried between the garage and the coop. I used a few voltage drop calculators and it looks like I will need a 6/3 to stay...
  10. J

    Outdoor TV antenna grounding question

    Ok Hello all and thanks for having me. I need some advice and joined this forum hoping to be pointed in the right direction. First off I am not an electrician and dont know the first thing about grounding or wiring. I will try to explain it the best I can. I recently moved to Middle Tennessee...
  11. O

    Trailer Sub-panel wiring and grounding?

    Hi, newbie here seeking advice. I have a semi-truck box trailer I'm converting into a workshop. Wheels and suspension have been removed and it’s sitting on railroad ties on the ground. Because it’s not on a permanent foundation I'm not allowed to permanently wire it to the house. I have chosen...
  12. J

    Inverter grounding

    Hello, can anyone please tell me why my 1500w inverter has an extra connection for an earth, and came with a rather thin earth cable? I figured that because the -ve from the inverter goes to the -ve on the leisure battery, which in turn is earthed back to the starter battery -ve, there is no...
  13. C

    Transformer Neutral Grounding

    Should the neutral of the transformer be provided with separate ground rod or can it be interconnected with earth bar which also connects the transformer frame and other equipment frame grounding. Is it correct as per the European standards? ( See the attachment)
  14. S

    Grounding advice on older property

    Hi, I’ve just been to look at a job to add a socket in a ex-mod (1960ish) domestic property. The cables are singles pulled through metal conduit in between the ground and first floor. The problem is that the sockets have no CPC conductor in the back box so I ‘assumed’ that the CPC was fed...
  15. Y

    Grounding an off grid system

    Hi System is victron quattro 10000 va inverter, 150 /70 mppt victron cc and 12 victron 100 Ah 12.8 V lifepo4 batteries wired as 51.2v 300 ah bank. Should I ground battery minus, cc chassis and inverter chassis seperately with own ground rod or should I wire to ground bus bar in main...
  16. N

    New to forum - laser cutter / general grounding help needed!

    Hi everyone So my electric-based knowledge is pretty low, but I have my own laser cutting business so am having to get to grips with a few things! Any answers are helpful..... I run a 45W laser from a residential building, this is an import from USA. I have been looking at upgrading the...
  17. J

    Common grounding in audio cables? Theory suggests yes?

    Hi guys! I am currently studying a BA (Hons) in Music Production, and I have decided to build a new stage box to go on stage, to route microphones cables and power supplies from the stage to the original inlets underneath the stage. I would like to use a 19-pin Socapex cable to make the...
  18. E

    Installation of grounding electrode in crowded areas

    Hi May I know about the standards in the installation of grounding electrode in crowded areas where clearance from the perimeter is not achieved?
  19. J

    Commercial Grounding a Wall Mounted Data Cabinet

    I have recently taken over in the IT side of a medium company and one of the things I have noticed is a terribly installed wall mounted Data cabinet. I have spent the weekend sorting it all out so it all comes up to spec but wanted to clarify on some points. It is currently mounted on the wall...
  20. M

    Cnc machine bonding to structural steelwork

    The factory I look after has just taken delivery of a new Cnc machine. I was there today to wire it up, no problems 4core 10mm swa done. The filter said that the machine needs a separate earth bond to the structural steel work. I said that's not my problem as its part of your installation as...
  21. D

    Best Way To Ground Rf Energy From Ethernet Network

    I'm not an electrician, but I am looking for some advise on the best way to drain a shielded CAT6A ethernet network in a UK house built in 1989. I need to drain the RF energy at one end. I have finished installing in excess of 500m of CAT6A and every cable save for one goes to two CAT6A patch...
  22. D

    ground cable for power windows

    hey guys sorry for the noob questions. im trying to convert my manual windows to power by using this guide. DIY: Power windows in a 96-00 civic DX i have done everything except for grounding the cables and connecting a power source. I am currently stuck at grounding the cables. Do i cut the...
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