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| A complete failure to understand the task at hand |
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| SiliconWizard:
--- Quote from: jonovid on December 05, 2021, 07:43:07 pm ---in the video insulated screwdriver tip was NOT used but the insulated stem of the screwdriver --- End quote --- Yes. This is fun. ;D |
| Cerebus:
--- Quote from: james_s on December 05, 2021, 07:23:55 pm ---I've been told it's against code in the UK to use potable water in hydronic heating but it is apparently allowed here. --- End quote --- Not really "against code", it's just something you wouldn't do. Steel 'radiators' are the norm here and that implies that you want the circulating water to have heaps of anti-corrosion additives in, so of necessity hot water for heating purposes will be inside a closed, self contained system that is completely separate from hot water for washing and bathing purposes. What is "against code" is to return any potable water to the public supply once it has been heated (above 25ÂșC) and all water heaters, including ones intended to provide potable heated water, will have a non-return check value in the cold supply. It used to be quite common to have non-potable hot water supplies to sinks, baths etc. but nowadays almost all hot water for washing and bathing is potable. The change comes about with a move from systems that heated potable water in a hot water tank with a heat exchanger fed from the heating system (thus employing boiler water with all the additives etc) to 'combination' boilers that have separate heating and hot water circuits, the latter for hot water 'on demand' only. So now hot water goes from cold potable water to hot tap water in a matter of seconds (thus remaining potable) whereas with a hot water tank water could be held for hours, possibly days, before being consumed possibly going through 'unsafe' holding temperatures for extended periods of time. |
| PaulAm:
In the US you can use the same water heater for potable and non-potable hydronic systems, you just need to use a heat exchanger so the nonpotable water is in its own loop. They can be connected with fill valves and a backflow preventer to keep the nonpotable water separate. |
| sleemanj:
In New Zealand, we just put on a coat. |
| SpecialK:
--- Quote from: jonovid on December 05, 2021, 07:43:07 pm ---in the video insulated screwdriver tip was NOT used but the insulated stem of the screwdriver also you can use the screwdriver tip on the gap of the two pins before removing any wires or clips --- End quote --- Really? I am have trouble telling is the shaft of the screwdriver is insulated. It doesn't appear to be. Bad camera work and lighting, not to mention my old eyes. I think he means to say grab the screwdiver by the (insulated) handle, which he clearly is doing. I haven't totally wrapped my head around those oil filled motor capacitors. They are pretty large physically and operate at line voltage. However, as the motor spins down so too should the voltage across the capacitor IMO. The windings would look like a DC short once all the fields collapse. Wouldn't energy capacity be a function of capacitance? I see these are pretty small in comparison to aluminum electrolytics. I think 5 or 10 microfarads in my experience. |
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