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  1. G9-big.jpg

    G9-big.jpg

    • EricMark
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  2. EricMark

    CCTV radio interference

    Have you tried turning off the cameras? I was working on a construction site, and we were having problems, it turned out the aerials on some radios were damaged which was affecting the rest, you only need one bad transmitter to stop rest working.
  3. EricMark

    110v transformers and overload on secondary

    I have questioned many times the risk of using a 110 volt brick where the overload is on the primary. As said 10 amp at 230 volt is nearly 42 amp at 55 volt, and 1.5 mm² Arctic cable will not take 40 amp without melting so presents a real fire risk. But wall and floor mounted I have used always...
  4. EricMark

    Combi boiler and zone valves help

    However unlike EPH and in fact most other smart controls, Nest does not work with any other units or as pairs using OpenTherm. So in real terms should only be used as a single unit. As on/off you can use as many thermostats as you want, but with zone valves the normal is to control the zone...
  5. EricMark

    Combi boiler and zone valves help

    There are a number of methods, much depends on the boiler, for an opentherm boiler you can use EPH thermostats which can be connected as slave and master to control boiler with an analogue signal but control zone valves on/off. The Drayton Wiser system also has a programmer/thermostat system...
  6. EricMark

    Deep cycle marine battery

    Does the outboard charge the battery? I know the one my did bought did not charge the battery, had electric start, but no charging. Outboards often have a very low charge rate, where inboard my son had 2 x 70 amp, so much depends on the outboard.
  7. EricMark

    EICR questions

    Down to basics, the EICR is designed to inform owners of the condition of the installation and give guidance as to which if any items should be tattled first, it was never designed as an MOT for homes, it was more like the more general home buyers report, and it did not matter one little bit if...
  8. EricMark

    Worlds fastest EICR ?

    The electrical trade is not the only one to have poor inspections, I found large holes between back plate and chimney sealed with gaffa tape which pealed off as soon as it got warm. I had a house buyer report done when buying this house, had not even realised they looked at the electrical work...
  9. fuse-box-1.jpg

    fuse-box-1.jpg

    • EricMark
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  10. EricMark

    Insulation Resistance zero Ohms

    Was the isolator switched off? If not then the neutral and earth are connected together by the DNO.
  11. EricMark

    RCD's how to test and when required, and what code?

    I know how I was taught to test a RCD, 6 tests in all two no go, two under 300 mS and 2 under 40 mS with no load. But thinking about it not so sure on the no load? We are told there are 5 common types with some others not seen much, type S, AC, A, F, and C. OK type S not used much now, but when...
  12. Type A.jpg

    Type A.jpg

    • EricMark
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  13. EricMark

    How long to leave a battery on charge?

    In the past I would have agreed, I have done all sorts, new acid, chemical, left on charge, and all seemed to fail, however I was looking for a cure within a short time, until I had a smart charger which would not charge over 0.8 amp I would not have left a old type charger on any battery for an...
  14. EricMark

    How long to leave a battery on charge?

    The caravan battery was left for over a year, by time I was allowed by English and Welsh rules to go and retrieve it there was not even one volt showing. The Lidi smart charger needs 7.3 volt to work out battery is 12 volt, so put a 7 Ah VRLA in parallel with the 75 Ah flooded battery and...
  15. EricMark

    How long to leave a battery on charge?

    The two year old 95 Ah AGM lead acid fitted to wife's Jaguar XE needs charging around every two months, the eight year old 95 Ah AGM lead acid removed from my wife's Jaguar XE when the starting problem was wrongly diagnosed will recharge in a very short time once every 4 months, the 75 Ah...
  16. EricMark

    How long to leave a battery on charge?

    Well it seems temperature related, on a warm day maybe 4 pulses an hour, over night with frost on car 8 pulses per hour, which explains why I did not notice this happening last summer. With three cars in house hold and with Pandemic mileage around 60 miles a month combined for all three, plus...
  17. EricMark

    How long to leave a battery on charge?

    With a smart charger and 5 out of 6 batteries I want to keep in good order it is a case of clip and charger and remove again one or two weeks latter. Using an energy monitor on supply to charger it is clear as the battery charges it auto turns off, however I have one odd one out, a 95 Ah battery...
  18. EricMark

    How do I charge AGM batteries?

    I know you can rip the battery apart and remove the valves (rubber caps) designed to allow gases out but not back in, however the whole idea of valve regulated lead acid or absorbed glass mat which are two names for same device is that a very measured amount of acid and water is used so the...
  19. EricMark

    How do I determine the current needed for my truck's wiring harness?

    Wiring sizes are not same as a house, in the UK where I live we seem to select wire sizes depending on use not fuse size, but since we use different class for wire size, can't help with US wire guages.
  20. EricMark

    How do I charge AGM batteries?

    You can't access cells in a AGM or VRLA, the point I am making is all about time, and it takes time to soften the sulphur in the battery, and both under and over voltage is a problem, battery voltage needs to be between 7.3 and 15 volt. Under 7.3 it is seem as 6 volt, over 15 and it assumes...

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