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  1. dlt27

    Non combustible cable supports in escape routes.

    The supports failed at around 550 degrees and according to Google a normal house fire burns at 600 degrees!
  2. dlt27

    Non combustible cable supports in escape routes.

    Hi all, I have just read a report by BRE on the effects on cable supports caused from fire. It stated the obvious about the plastic clips, plastic conduit etc failing. However what I found interesting was that the metal supports failed due to the plastic rawl plugs failing. So I just wondered...
  3. dlt27

    Electrics on display furniture.

    At the moment they're not a member. Do they need to be? I am with NAPIT for my private work but was thinking of giving it up..
  4. dlt27

    Electrics on display furniture.

    One of what scams. The company has been going 90 years. This area of electrics although not complicated is new to me. E.g. some of the furniture is metal with electrics on so at the moment I am bonding everything, pat testing it and treating it as class 1 equipment. I just wanted to find out...
  5. dlt27

    Electrics on display furniture.

    Hi don't know if anyone can help! I have been an install electrician for the last 10 year's, but have now become a maintenance manager of a manufacturing company. I carry out maintenance, install work and also production work which is basically wiring up lights, sockets etc on display units for...
  6. dlt27

    power factor correction

    I know Pf = useful power/ total power. Its the cos bit that is throwing me. Is my calculation right or am I missing something��
  7. dlt27

    power factor correction

    It's not homework. I just had an auditor ask me today. I couldn't remember. I though it was 0.8 x 25 so equals 20 KW. However it's been a long time....
  8. dlt27

    power factor correction

    Hi can anyone help please. I was asked the following question today. An organisation has determined their sites total power is 25KVA and it's power factor is 0.8. Calculate the site's useful power( including units). Could anybody please help or provide me with equation to calculate the...
  9. dlt27

    Maintenance

    It's a large company and large site with a lot of cnc machines etc. There is also a lot of very old plant. Also about 200 employees work there. The guy who works there at the moment has been there about 40 years, but is retiring at Christmas. However he doesn't seem to work on the machines. He...
  10. dlt27

    Maintenance

    In that case how do you ever gain experience and knowledge. Also how do I find out about these statutory machine regulations. Thanks.
  11. dlt27

    Maintenance

    Hi all. Just started a new job in electrical maintenance today. I have spent the last 10 year's doing all types of install work however have decided to move indoors. The guy who is there at the moment has always had people in to work on the machines rather than do anything himself. Just...
  12. dlt27

    High zs on RCD's.

    Hi all. I carried out an EICR yesterday. It was a BG split load consumer unit and when testing I noticed the zs values were coming out high. I noticed on the 1 rcd there was 0.50 Ohms difference between feed and load side of rcd and on rcd 2 there was 0.60 Ohms difference. Just wondered if...
  13. dlt27

    Max Zs for TT.

    Don't know if I'm being a proverbial div, but could someone tell me the max Zs for 80A 1361( distribution cct )on a TT system with disconnection time of 1.0 sec. Thanks.
  14. dlt27

    electrical maintenance/ plc's etc.

    Thanks for info.
  15. dlt27

    electrical maintenance/ plc's etc.

    Hi all. I am desperate to more from my role as installation electrician to electrical maintenance. I have gained experience in all areas and sectors. Ie Inspection and testing, fault finding, motors etc. However I appreciate this doesn't really help with today's maintenance jobs with plc's etc ...
  16. dlt27

    Eicr

    I recently done a niceic solar course down south. The guy carrying out the course also carried out courses in eicr's. I put the question to him about what codes I should put to various observations ie ones that were safe but not up to current regs. (Ones I didn't think deserved a code). His...
  17. dlt27

    Eicr

    Hi all, I have done a few EICR's before however could do with a bit of advice on what codes you more experienced guys would give these observations; 1 Old 3036 DB made up of wooden base/back. (C3?) 2 Underszed main bond. (C3?) 3 Cooker switch mounted 18" above cooker (C3?) 4 Mutiple cct's in MCB...
  18. dlt27

    MAJOR problem with supply...

    Just to let everyone know. Got to the bottom of it today. Transformer guys came in today and discovered the neutral to earth link was missing in the transformer. Apparently it has been like it since it was installed in May. What made me chuckle was that the guy said it happens quite often...
  19. dlt27

    MAJOR problem with supply...

    Tony's info was invaluable. Haven't got to the bottom of it yet, but HV guys are saying they think the same as you guys. A failed or failing neutral. However they haven't carried out any tests out yet. Aalso apparently there was a disturbance on the network (possibly a transient voltage) last...
  20. dlt27

    MAJOR problem with supply...

    I understand that but any phase to neutral is 240v So neutral isn't broken, but possibly failing.

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