separation

separation

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  1. J

    Cable Trench with 2 Voltage Levels (800Vac and 34.5kVac)

    Hello, We have a project where there are sections where 34.5kVac cables will be laid below 800Vac cables. Conductors are Aluminum. Any chance anyone knows a standard which states the min. allowable separation distance when cables of different operating voltage levels are laid in the same...
  2. lloydy304

    Electrical separation (complicated)

    Hi all, Hoping for a little advice. I work in the Asbestos industry and we manufacture mobile decontamination units we follow the HSE 247 that states all units must comply with BS7671. We have had a heads up that new regulations may adopt the use of electrical separation (assuming the use of...
  3. V

    three phase board separation

    hello everyone, I have a little problem. I've got a three phase board, it has the three phase sauna, one phase lighting and sockets connected to it. The problem i am facing right now. This is a comercial unit. So the problem is that the sauna makes the RCD trip every so often. And the board...
  4. Pretty Mouth

    Testing for electrical separation

    Hi all. I'm a member of a FB group for people trained through a particular training provider. Recently someone posted a query for testing for electrical separation for shaver sockets, and my ex trainer responded with the following method (cut n paste verbatim): you need to confirm separation...
  5. M

    Band 1 and 2 separation (folklore)

    Hi, From site to site someone always seems to have a new previously unknown insight towards elv and Lv running together. I’ve heard : ‘They can run together for 600mm” “They can cross over and touch” amongst others. No one however can ever provide a reg number. Does anyone here have any...
  6. multimick

    tray separation or not ???????

    i have installed some 4inch tray horizontal around a mains room in factory carrying for the moment a couple of 4mm twin earths ,more will be added later, the cctv and data guys have come along and tywrapped their cat 5 cables to this tray ,it maybe just a temp measure as it is very roughly done...
  7. F

    Feeder and Branch separation point

    Hi, could some one please explain to me the point at which the feeder stops and becomes a branch on the attached drawing. This is really bugging me and if I had hair it would all be ripped out by now and I am struggling to under stand. Anyone's help would be most appreciated. Thanks in advance
  8. L

    Underground HV cable & Communication separation distance

    Hi, Is anyone can suggest me, what is the separation distance between underground HV cable and Communication cable? An existing communication duct is found across the new HV cable route whilst new trench is dug for HV cable laying. Is there any reference or literature that mention about the...
  9. Arktosik

    Band 1 and band 2 separation

    Hi Is it agree to put power cable and data cat6 on the same cable tray .One side power cable in trunking other side cat6. it's 15 cm separation between them.what separator should be use? Thanks for help
  10. C

    Protection By Selv, Pelv Or By Electrical Separation.

    Hi, I am relatively new to testing and was just doing some research into it all as some time in the future may take my testing and inspecting exam, I just wanted to confirm this test exactly as i want to make sure I'm understanding it correctly, I know nowadays this part of the test is quite...
  11. L

    Minimum separation distance between LV underground cable and Water service

    Hi, I have noticed the following item in a new construction site. Could anyone can give me further suggestion, please. 1. What is the minimum separation distance between LV underground cable and water pipes (Cold water)? This is for new underground cable lying. Water pipe is to run parallel...
  12. S

    New C/U and gas pipe separation

    HI Does anyone know if the regs on 150mm seperation between c/u and gas pipes are still the same with the c/u's being all metal now? Thanks Sam
  13. C

    Earth at the separation point (TN-C-S) of the DNO...

    Hi all. It seems there has been quite some different opinions in my classroom as to who should really change the earth cable in the incoming position where the 100A fuse is, in domestic installations. Can any qualified electrician, change the earth cable at the DNO side? Say for example on an...
  14. I

    separation of main power and safety circuit. I've been told off!

    Hi, I had an interesting conversation at work today which might cause a few problems. I am fitting 4 pole MCBs to protect the 1.5mm 3 phase feed to some motors (There is no neutral). The 4th pole is part of the control circuit. My idea is that if the MCB trips, it will delatch the control...
  15. I

    Gas / Electric Separation

    I have some electrical cables in the garage that cross a gas pipe at 90 deg. Am I right in thinking that there should be 25mm separation or the gas pipe wrapped in insulation / PVC? Would it be ok to acheve this by slipping a PVC waste pipe around the gas pipe or is there something available...
  16. M

    Separation of circuits 314.4

    Hello, I'm doing a periodic inspection and am unsure weather to fault this, I have a generator which is the source of my supply, this then feeds two main distribution panels out of the main switch. So there is two 3 phase supply cables out of one MCCB. Does 314.4 come into play or does it...
  17. T

    Frame bonding and TL electrical separation?

    Hi All, My assessor suggested there is no need for frame bonding if a TL inverter has electrical separation between DC and AC. This is news to me and wonder if he is getting confused RCD requirements, but he is adamant. Anybody heard this? Is everybody bonding TL’s and including earth...
  18. K

    SELV and 230V circuit separation

    It is planned to install a central 24V SELV supply in a domestic residence, e.g. to power LEDs. According to my reading, BS 7671:2008 chapter 414.4.1 (ii) requirements for protective separation between a SELV and 230V circuits offer the following options a) double insulation -or- b) reinforced...
  19. Dean Williams

    Electrical Separation for more than one item

    Hi gang im currently testing a theatr in north wales. ive come across a 1:1 isolating transformer feeding 32 bench sockets, it was installed in 1976. its in an audio/visual repair shop where they used to repair old tvs etc. all the sockets have an earth L-N measures 230v N-E measures 110v N-L...
  20. D

    separation of data , coax.

    Have got a building to wire with data and coax with the usual power. Am going to put in a trunking system. the question is can i run my data for IT sockets in the same compartment as tv coax cable??

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