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Recent content by Ahr35181

  1. Ahr35181

    North American motors to TEFC-FLP-2.3.

    Can someone explain what the 2.3 indicates? Cheers
  2. Ahr35181

    Pre-ATEX Electrical Equipment - Re-use

    When ATEX first came about, I remember reading somewhere that it was ok to re-use pre-ATEX electrical equipment on new installation work (assuming the equipment is in good condition) & to re-furbish existing pre-ATEX equipment (e.g. motor overhauls). Could anybody name a standard or other...
  3. Ahr35181

    2 Speed 1 Winding 3 Phase Motors

    We have some new workshop machines purchased from abroad, the wiring diagrams for the motor starters are identical to the following:- http://www.ssusa.cc/reference/wiring_diagrams/standard_series_drawings/series_110/110_01.pdf The are rated at 2.2KW / 1.1KW, but both overload relays are set...
  4. Ahr35181

    ELV Lighting in an Machine Shop

    Would anyone no of any UK / EC standard which recommends close up machine shop lighting should be ELV rather than LV ? Thanks in advance Alan
  5. Ahr35181

    30ma elcb trips out

    If TV’s contain switched mode power supplies, then protective conductor current is your likely problem. If you are in the UK, any new or altered socket outlet circuits which may be used to supply IT or electronic equipment should comply with section 607 of BS 7671 (high integrity earth). The...
  6. Ahr35181

    3-Phase Welding Sockets

    We use FDB units which incorporate Emguard earth monitoring units:- http://www.fdb.uk.com/pan17.html Alan
  7. Ahr35181

    3-Phase Welding Sockets

    For many years we have used 3- phase welding sockets incorporating Emguard earth monitoring units & 30mA RCD units. We are thinking about ditching the Emguard units & just having sockets with built in RCD units. Any thoughts on this, anybody else use welding sockets incorporating earth...
  8. Ahr35181

    HV Substation Design

    I'm looking for a short course to provide me with a better understanding of HV Substation design & HV distribution. Kefax (IEE Endorsed Provider) in Mansfield do the following......Distribution System Design & Planning 5 day course. Any advice would be much appreciated. Cheers. Alan
  9. Ahr35181

    Motor Overload CTÆS

    I’ve come across two similar 60/1A ct’s, one is marked two primary turns, the other three primary turns. Does this mean two / three primary turns respectively are required to give a 60/1 ratio in each case? To me, a 60/1A ct is 60/1 with one primary passing through??? Thanks in advance. Alan
  10. Ahr35181

    Bonding Metal Cable Glands

    When terminating SWA cable glands into painted metal gland plates, traditionally we use brass earth tags with individual single core cables to an earth bar, this is not a problem in distribution panels put can quite easily over fill an earth bar in a distribution board. What do others think...
  11. Ahr35181

    VSD DAMAGED - WHY?

    ejnjkj "V.F.D's just aren't reliable in any working conditions" We've been using them with for many years with few problems, particularly modern types. “They are very complicated electronic devices, and unless you are an electronic wiz they are not serviceable” The old versions were easy to...
  12. Ahr35181

    Support the red yellow and blue

    oceanamber, Rather than using BN, BK & GY (we previously used R,Y & B) in circuit reference labels, cable tags & core tags, we will be using L1,L2 & L3 for phase identification & N for neutral (as these are un-changed). Therefore an addition to circuit E1/R4 in the hospital mentioned would be...
  13. Ahr35181

    Support the red yellow and blue

    Where I work, we were planning to change over later this year, but have been forced to change over has from now because our cable supplier has depleted stocks of the ‘old’ colours. I bet the IEE never thought of this when giving the two years grace!!! Alan
  14. Ahr35181

    VSD DAMAGED - WHY?

    Lots of interesting replies here. We used to install a lot of Danfoss drives, Danfoss strongly recommend the fitting of a back plate if the drive is not mounted directly, to ensure all cooling air is dragged passed the cooling fins. Anyway, why on earth would anyone weld brackets onto a...
  15. Ahr35181

    Hazardous Area Fires / Explosions

    Would anyone be able to point me in the right direction in obtaining factual cases of fires / explosions in hazardous areas caused by static electricity, non suitable electrical equipment, non compliant electrical equipment installation practice, non compliant electrical working practice or lack...
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