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conductor

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  1. C

    Earthing Conductor Size- Good?

    Alright, so what do you think of these CPC sizes in relation to the phase conductors? 90*C insulation, TN-C-S supply MCB / Live / CPC / Multiplier 15 - 2.08mm2 - 2.08mm2...
  2. D

    6mm Main Earthing Conductor

    I'm looking at doing a CU change. Current main earthing and bonding conductors are both 6mm. Tails are 16mm on a 60/80 amp fuse (TNCS). ZE = 0.1 , 230v, single cable not bunched. Looking at the regs (543.1.1) and applying the adiabatic equation (543.1.3), 6mm seems ok for main earthing...
  3. K

    Continuity for Neutral and cpc in TNCS due to PEN conductor?

    Hi, I am struggling to understand one concept if anyone could shed some light. as TNCS has combined neutral and Cpc so if on the consumer side hypothetically if you check continuity on N+Cpc without disconnecting any conductor, do we get continuity of Neutral and CPC as on the supply side, its...
  4. S

    Protective conductor in T&E

    Hi all Been in electrical/electronics for many years and am now semi retired but keeping my hand in, but is it just me, my age or what but back in the eighties / ninties nothing seemed to change that much and yes there was far less choice in fittings. Having spent more time in industrial than...
  5. C

    Conductor Short Circuit Temprature

    Ok, say I have a 2.5mm2 or 3.31mm2 copper conductor 90*C rated. 100,000 amps of available fault current. 277/480 volt Y system, TN-C-S. MCB protection. Would the conductor survive such a short circuit? How do I determine this?
  6. K

    Current reading on ground electrode conductor in main panel

    I live in the Philippines but I have the same US electrical system (2 x 110V hot + 1 x neutral). I have two ground rods buried 8 ft. deep and connected to the main panel. Netural and ground are bonded in the main panel. And from the main panel, all 4 wires (2L + 1N + 1G) go to sub panels. Ground...
  7. P

    Do you test the suppliers earth conductor for continuity??? (Initial verification)

    Hi guys, QUESTION: Do you test the suppliers earth conductor for continuity??? The guidance note 3 2.6.5 refers to regulation 643.2.11 which requires a continuity check be carried out on all protective conductors including: EARTHING CONDUCTOR, CPC's and bonding conductors. I am aware of the...
  8. N

    size of earthing conductor from switched isolator to CU

    Domestic single phase supply, TNCS, 25mm tails. From supply to Fused switched isolator : Earthing conductor is 16mm. From isolator to CU : Earthing conductor downgraded to 6mm for what ever reason I don't know. Is there something in the regs that says after an isolator the conductor can be...
  9. I

    Use of Singles for Main Earth Conductor and Incoming Neutral?

    Hi folks, Limited experience here and never come across this before. Whilst I can appreciate the conductors may be the appropriate CSA combined, (I haven't measured them) terminating the Main Earth Conductor in the MET like this with what looks like 4 x 4mm2 doesn't allow for the conductors to...
  10. I

    Need to understand the neutral conductor

    Appreciate there are a lot or questions about this already but I just can't seem to grasp it so hopefully asking the question in my way will help. Background: UK 240v AC domestic system. As I understand it, if everything is wired correctly and there are no faults, I can touch the neutral...
  11. B

    Conductor insulation breakdown

    I’m currently problem solving a lighting circuit issue on a retail park. newish install (12months old) IR of 12M Ohms across all three conductors, getting some very odd IR readings overall, I got a low reading between two separate disconnected cables, sent my meter off to be calibrated and came...
  12. KeenPensioner

    Insulation resistance with broken line conductor

    Hi, I'm not an electrician but I'm studying the material required for the C&G 2394/5 just for the sake of it. I think I understand the theory behind insulation resistance testing (but maybe not!) and the reason the test is performed at 500V (insulation condition, fault finding) and that loads...
  13. P

    duplicate protective conductor question

    Is there a requirement stipulating a final circuit supplying only one socket outlet should incorporate a duplicate protective conductor?
  14. L

    Gas Bonding Conductor in 20mm conduit

    The scenario, Property has no bonding to gas meter. There is a 4mm T+E radial from the DB to an outside socket which is located 300mm from the gas meter (external meter). The 4mm T+E is housed in 20mm plastic conduit running along the external wall. To prevent things looking a complete mess...
  15. G

    Regulation 434.5.2 - Time a conductor can withstand fault current

    Can anyone help me clarify the formula in regulation 434.5.2, the time a conductor can withstand a fault current without sustaining damage. t=k2 x S2 / I2 The regulation states I is the effective fault current. Does effective fault current mean the prospective short circuit current/...
  16. marconi

    MARCONI'S FINAL RING CIRCUIT LIVE CONDUCTOR BREAK DETECTOR IDEA

    Over the last few days I have been stuck indoors because of the rainy weather. To pass the time I cobbled together my simple idea for a FRC live conductor break detector, ie break in L or N. I also have a working demonstrator for detecting a break in the cpc but I will/may post that another...
  17. S

    Questionable Conductor Size

    I am in the process of installing a 5 core 70mm feeder cable for a DB. 70mm cable lugs are too large for the cores but 50mm fit perfectly. I have taken this up with the cable supplier. Their response was that 50mm lugs are often used om 70mm cores? Having been in the trade for 41 years I have...
  18. snipersmith87

    Broken PEN conductor

    Attended a seminar today based on EV charging points. The broken PEN conductor was mentioned and converting to TT. 2 things. 1. How often does a PEN conductor go down?? My understanding was that they use PME to reduce this risk further. 2. I asked the question as to should we be installing...
  19. Strima

    Main Earthing Conductor Termination with SPDs

    Here's a question that I was asked earlier. If you have SPDs installed in a DB is it permissible to terminate the main earthing conductor into the SPD first then the DB earth bar? Or must it be terminated in the DB earth bar first then the SPD?
  20. C

    Conductor Operating Temperature H07RN-F

    Hi All, I'm trying to calculate CCC & VD for H07RN-F Single core cable. Used for event powerlock runs. TPN AC - Ref Method C - Flat & Touching Table 4E1A/B covers Single Core 90*C thermosetting insulated cables, which I have used correction factors to convert these values to flexible cable but...

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