protective

protective

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  1. Subpra

    Need help about Surge Protective Device

    Recently I have installed Type 2 Surge Protective Device SPD 20 to 40kA, Type1+2, Phase + Neutral + Earth (2 Pole 275 Volt AC) (Uc-275VAC, In-20KA, Imax-40KA, Up ≤ 1.5 KV) after 64A DP MCB at home MDB. The home lode is around 1.75KW. We have 220 VAC main line here. At the evening of 3rd day...
  2. 2

    Large cable protective device and enclosures

    Hi, thanks for reading this. Ive been asked to look at a job where the DNO connection (single phase 80A TT) is a long run to the final circuits. Small feeder box has been installed and the volt drop dictates 95mm cables are needed to take to another feederbox where the feeds into the building...
  3. J

    Calculate the appropriate size of the protective conductor exam question

    fault = 400 A Operating time of protective conductor = 0.15 s Constant k, for the material of the conductor = 134 a 1.5mm b 2.5mm c 4.0mm d 6.0mm Just want to make sure I've got this right,
  4. saucyjack

    Surge Protective Devices

    Hi guys, could someone help with the following please? The scenario is: Domestic property supplied via three phase (with a 3P main DB, NO SPD). Tails split via henley blocks, and a second single phase DB installed; this DB has an SPD for it and it's circuits. Now, normally with a single phase...
  5. newfutile

    Protective measures other than ADS?

    In the EIC the above label has a tickbox. does this refer to selv/pelv , out of reach and so on ,or is the fact its in an enclosure applicable ?
  6. N

    Solar solar protection for inverter and battery

    Hie. How can I size my protective devices for my solar installations because most breakers keep burning out. I'm I missing something?
  7. D

    BG Surge Protective Device

    Is there a reason why these surge protective devices come with 2 neutral links?
  8. Yp510n

    continuity test on a protective bonding conductor

    Hope i find someone who can help me with this one. I have this question on an exam: A continuity test on a protective bonding conductor gives a result of 15ohms. What possible reasons for the result and what actions (if any) that should be taken? My answers where: -wrong size conductor shows...
  9. M

    Am2s Continuity Of Protective Conductors

    In the am2s assessment where do I write the Continuity Of Protective Conductors test results? Where on the test sheet do I add the results?
  10. F

    Main Protective Bonding

    Evening all, Recently started working for a company carrying out electrical installations - I've found a job today that didn't have any bonding to the incoming water or gas supplies and both were in metal so do require bonding. Spoke with my boss to explain and said that I was popping out to...
  11. cliffed

    Main earth bonding protective conductors

    EICR recently done, Swa sub mains armouring used for cpc & MEBPC. Installed 40 years ago, water/gas/structural bonding required, these are @ 10mm Tncs earthing system @ origin which is remote from buildings 120mm tails. The sub mains vary in sizes from 25mm to 50mm….what’s your thinking on...
  12. cliffed

    Main earth protective bonding conductors

    We now have no need to MEPBC to water if proved it’s not extraneous…is anyone MEPBC metal ducting for HVAC & such.
  13. cliffed

    The Main protective bonding conductors

    We have tables for the correct sizing of earth conductors & MPBC. We can also size cpc’s by calculation,can we actually calculate for MPBC.
  14. cliffed

    Main protective earth bonding conductors

    We are now told no bonding is required if the Water enters via plastic insert, same with the Gas.. So why are we bonding the Lighting protection conductor to the Main earth terminal bringing an extraneous conductive inside the building,when we are actually trying to prevent this happening.
  15. 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...
  16. Pretty Mouth

    Why are main protective bonding conductors sized as they are

    Hi all. Hope you are all well and virus-free. This question is not how to select main protective bonding conductor sizes according to the regulations. That I understand how to do. What I am asking is: Why do the regulations require such a large CSA for Main Protective Bonding conductors...
  17. G

    hello...new here.....earthing of protective material to kill wifi in van...…..??

    helloo peeps.....new guy on the block... I have a tracker in my van which also has a dastardly wifi at 2.43 ghz in it. it is on 24 hrs a day. It is now beginning to show symptoms which are painful - sometimes my left eye hurts as I am driving. it is in the glove compartment of my berlingo. I...
  18. Risteard

    ETEK protective devices

    Just wondering if anyone has any experience of the following: Type B RCD + 2 MCB Garage / Mini Metal Consumer unit - EV Charge Point Install - https://shop.evchargersdirect.co.uk/collections/accessories/products/type-b-rcd-2-mcb-garage-mini-metal-consumer-unit-ev-charge-point-install? I believe...
  19. P

    duplicate protective conductor question

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

    Continuity of protective conductors...Initial/Periodic exam.

    Hi, With Referance to the current Initial verification and periodic practical exam. Continuity of protective conductors, including main and supplementary bonding. I understand using method one with circuit c.p.c, Connect line/c.p.c in connector blocks. Results provide, continuity, R1=R2 and...

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