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  1. jre

    Stray Voltage question

    In New Zealand, "the land of milk and plenty"our policy in dairy sheds is EARTHING and BONDING, the more you can earth and bond together the better, including reinforcing steel in concrete work. If a Utility neutral connection should then become faulty,the entire shed mass is at the...
  2. jre

    3Phase meter reading high

    It sounds more a metering or multiplier calculation problem to me. Don't discount that the owner may have been undercharged previously, and is now metered correctly. 6000kwh per month for a restaurant seems more feasable than under 2000kwh unless all cooking is gas and the load is only lights...
  3. jre

    Battery Explosion

    We are all assuming that the batterys concerned are lead/acid wet cell. Can you confirm that this is the case? If so, they may be the wrong type of construction for a trickle charge, low load application, such as I would expect on a UPS. "Car" type batterys are made for high load and...
  4. jre

    SS groundwater well screen

    (New Zealand) I have been making and installing shallow water bores for some years using s/s screen over all PVC components and suction pipe (down to 6.5m max). These are normally uncased but I have used 100 or 150mm PVC casing where needed. MY...
  5. jre

    electric waterheating element for hard water

    Thank you for your replies. I am in New Zealand and investigating why we cannot get domestic water heater elements that last.We can get 304 s/s and Incoly sheathed elements (at a price) but as they are machine made the element leg diameter is rather small to give a good watts/sq.in.ratio...
  6. jre

    electric waterheating element for hard water

    What materials have proven to be the most resistant to the agressive action of hard water on domestic type electric hotwater element sheaths. The problem seems to occur after a layer of lime builds up and insulates the heat transfer between the element sheath and surrounding water thereby...

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