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isolation

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  1. R

    Groundwire sparked while connecting it to the main ground

    Hi all So, my brother bought a (new to them) house. I've been redoing the fuse boxes in the house. Today, while putting the grounds from the kitchen together the last wire made a little spark... but the differential didn't trip so is this a big problem? Something to look into? Or something to...
  2. T

    AM2 advice failed safe isolation

    Hi I am looking for advice please. Last week I done my am2. And the only thing I failed on was safe isolation of the 3 phase circuit. The assessor told me to safely isolate the 3 phase isolator. So I turned of the isolator put a lock and tag on and put the key in my pocket. I then...
  3. P

    Safe isolation in the TN-C-S world

    While reading the IET articles there was one on the open PEN risk and now the DNOs are adding another step to "safe isolation" where they clamp the earth bond to check if there is diverted neutral current present before disconnecting anything related to that. The youtube video for this: TL;DR...
  4. V

    House Alarm reset after isolation - who foots the bill

    This one has caught me out twice now. Needed to isolate power to house that has a battery backed up alarm. Unknown to me the battery was flat, so when I turned on the power the alarm reset to factory settings and wouldn't switch off, resulting in an call out to a security firm on a Sunday and...
  5. S

    UK Safe isolation

    Hi, can anyone recommend someone that can write me a 'safe isolation and re-energisation of installations procedure'
  6. V

    Shock from a consumer unit even after Safe Isolation!

    Not a big one, but it bloody hurt and scared the pants of me! If anyone reading the following knows why this happened I'm all ears. I safely isolated a garage consumer unit, but didn't turn off the associated MCB in the house, so the tails to the unit were still live, ready to put in a new...
  7. M

    Isolation Tx, Bonding of Metal Parts

    Hi all, quick question, I have come across a 230V control circuit supplied from an Isolation Transformer. The controls are located within a metal clad enclosure near to local socket outlets and other accessories. I have measured continuity between the metal casing of the controls enclosure and...
  8. T

    Rating for Shower Isolation Switch

    I have to install a shower isolation pull-cord switch. The shower is on its own feed from the consumer unit and has its own 30A MCB. The shower unit is a Mira Event XS which has hot and cold water supply and hence consumes only 150w in normal use. The shower unit is fused at 3 amps. My...
  9. Pete999

    12 easy steps to safe isolation

    Best bit of info Iv'e seen on Safe Isolation in the October issue of PE and Installer published by ESR cut it out and laminate good for everyone/
  10. E

    DB Change & Isolation

    Hi All, I've turned up at a job where the tenant needs to change the DB as the face is falling apart and was cut to fit more RCBO modules. Anyway the questions are as follows: 1) isolation, the supplier has been made aware of the change by the property manager so I'm reluctant to cut any tags...
  11. F

    No isolation of Neutral in Single phase boards

    As title. Doing an EICR, have come across a couple of DBs, where the neutral goes straight onto the bar on Single phase boards. Whats your views on this guys? Should it have a requirement to be isolated? Is there a reg for? If so then it can be coded. My boss thinks its dangerous. I don't, but...
  12. J

    Advice on locking off and isolation

    Hi guys I wanted abit of advice on the best way to electrically isolate a supply when you don’t have the correct lock offs for the device i.e withdraw-able fuses (I know you can get lock outs for these but was wondering what could be done if these aren't available). I guess I’m just asking about...
  13. E

    DNO Isolation For Changing DB

    Hi All, I need to change a DB in a block of flats in central London (W2 postcode), where EDF can't give a date for at least 6 weeks to come and isolate the supply, but at the same time won't / can't give out a date after this, which makes no sense to me! This is both options of just popping...
  14. C

    AC isolation switch?

    Instead of using the standard rotary isolator for the inverter, is it acceptable to use a standard 100A switch within the consumer unit? It's DP, can be locked off, and will obviously be clearly labeled :-) Anything wrong with this method?
  15. SJD

    Consumer unit with no isolation of N

    Came across a consumer unit today, where there is no means of isolation of the N, see below. The property is a flat, fed with 4-core SWA plus a separate 16mm2 E, from a TN-C-S supply via a TPN switch fuse in a communal meter cupboard. There are 3 supplies - 24hr, plus 2 off-peak supplies...
  16. B

    Electrician Jobs Safe Isolation Level 3 Electricians Wanted

    Brookvex IMS Brookvex is recruiting electrical engineers/contractors to join our London Underground electrical minor works team to carry out fixed wire testing and electrical installation works. Applicants must have the following: Valid Driving Licence LUL Sentinel Card Safe Isolations Level...
  17. M

    Mains isolation

    we have a mains supply 400A from a switch room which is fed from a switch fuse to a old Bill red spot board which is approx 80M away,we are removing the fuse board and installing a bus bar chamber in its place,do we need to install another switch fuse isolator below the bus bar chamber or is the...
  18. S

    Fan isolation switch configuration error

    Hello Guys I am new to the forum I was looking for a little advise if possible. My bathroom fan isolation switch has cracked & was looking to get it replaced. I isolated the supply and inspected it. As it looked very simple to replace I purchased a new switch. The new switch arrived but it has...
  19. R

    Cooker Isolation Switch Installation

    Hello all Here's a picture of a newly installed cooker isolation switch. As you can see it is located under a worktop. You are looking at it with the two fridge that is normally located under the worktop in that location removed. I would appreciate your opinions on the location of the switch...
  20. L

    UK best way for isolation

    ive been asked to rewire 5 flats , each flat is on a card meter, a new cu is to be installed in each flat to cover 3/4 circuits, a new landlords main board is to be installed by the front door, can each flat be isolated from the main board or does each flat need individual isolation like it is...

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