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Recent content by sparksski

  1. sparksski

    MV verus LV generation

    Maunsell I am employed in a Trust and about 10 years ago we moved from a 11kv ring (with 2 11KV REC incomers) and local lv generation at each substation to a 11KV ring with 2 central 1MW 11kv gennnys. We removed the existing 415V gennys bar one which was connected into the substation serving...
  2. sparksski

    MV verus LV generation

    Maunsell You will have to ensure that your system complies with the following HTM documents: HTM 2007 - Electrical supply & distribution HTM 2011 - Emergency electrical services HTM 2020 - Electrical low voltage systems HTM 2021 - Electrical high voltage systems There is a lot of info in...
  3. sparksski

    Pfc and Ze - values by enquiry? (UK)

    PhilT74 The REC always used to quote you 16KA (@ 0.55pf) as a maximum potential, this was assuming you were located next to thier transformer, as you found when you move away from the source and measured the reading it is significantly lower. Their figure is a distance of 35M for 4KA. There...
  4. sparksski

    Warning Notices - BS 7671: 514-10

    The BS Reg is clear that if a voltage greater than 250V exists in seperate enclosures or equipment which can be reached simultaneuosly by a person then a warning sign needs to be fixed to that equipment before access is gained to the live parts. I have always used the rule of thumb as being a...
  5. sparksski

    Bonding of Glands - star washer vs earth tag

    Hi Ken Almon When I used to install armoured cable using glands and tags or conduit etc and washers I would always scrape away the coating on any enclosure back to bare metal to give as good a contact as I could. This seemed to be the normal practice. Without going back to bare metal you...
  6. sparksski

    HV Protection Training

    Ahr35181 WTI Training at Burn Hall in York offer protection courses in addition to other HV,LV,BS etc courses. Their contact details are: Customer Services 01189 407878 customer.services@wti.co.uk Aquilla (formerly MEB) offer all types of HV training as do East Midlands and all the old...
  7. sparksski

    Convert KvA to amp

    gerdsen As a very simple rule of thumb for a 3 phase generator the line current per phase can be found by Genny KVA X 1.4 So a 500KVA genny = 500 X 1.4 = 700A per phase. if you want to know the KVA rating of the genny from the line current of 700 Amps. Then KVA rating = 700/1.4 = 500KVA...
  8. sparksski

    TESTING RCD SUPPLIED BY A GENERATOR

    Ahr35181 I was always under the impression that portable generators relied upon thier own earth spike/rod to provide an earth connection and as such could not be relied upon for a good earth loop impedance path during a fault. This is then the reason that the RCD is used to provide protection...
  9. sparksski

    R-12 vs R134a

    I am no expert on car AC but I have worked on domestic & commercial refrigeration where I have replaced R12 with a straight drop in replacement R49. This tends to require about 10% more volume and pressures tend to be about 10psi higher. No change in performance has been experienced. I have used...
  10. sparksski

    ASD savings based on pump motor loading??

    As all the previous comments suggest, VSD's are not the answer for everyone. If you are using throttling devices on pumped liquids or damper control for air movements and theses devices are continually varied to change output then yes VSD's may provide some good energy savings, and cut down on...
  11. sparksski

    British Standard of wiring

    The British bible on Electrical Installation wiring is BS7671 - Formerly The 16th Edition of the wiring Regulations. This document will give you all the information you require
  12. sparksski

    what is a KUXON

    Klixon is also the standard term used in the A/C and Refrigeration industry for all over temp cut outs. When I first came across the term I wondered what those boys were talking about. I had never heard the term in electrical engineering/contracting/maintenance.
  13. sparksski

    Six Sigma, SPC &DOE

    angkiki Check out www.iqa.org The Institute of Quality Assurance has many publications on thier site free to download. They have publications on SPC and six sigma! You need to just keep searching the WWW as there are plenty of sites with free info out there.
  14. sparksski

    LV distributions techinques

    Maunsell The fact that you mention hospital and trust leads me to believe this is a UK hospital. If this is the case then all electrical works have to comply (in addition to the usual regs)with Health Technical Memorandum(HTM) documents. These cover HV, LV, Emergency electrical services,Med...
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