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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Generator and boiler lockout revisited
Hi Thanks to those who replied to my posting on this a few weeks ago in which I said that ch boiler locks out when I run
it from a petrol generator supply Sparks: you suggested I measure voltages as generators are often centre tapped. Results (no load) are - L--N 240v N--E 85v L--E 85v I am now more puzzled than ever. Where's my missing 85v? -- Richard |
#2
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Generator and boiler lockout revisited
In an earlier contribution to this discussion,
Richard Walker wrote: Hi Thanks to those who replied to my posting on this a few weeks ago in which I said that ch boiler locks out when I run it from a petrol generator supply Sparks: you suggested I measure voltages as generators are often centre tapped. Results (no load) are - L--N 240v N--E 85v L--E 85v I am now more puzzled than ever. Where's my missing 85v? The output is probably floating - with no electrical connection to earth - and what you're measuring is probably just an induced voltage. Chances are that you can actually strap N to E with no ill effects. Try this: Connect a mains 100w bulb between N&E and see whether it glows at all. Assuming it doesn't (mine didn't!), repeat the above 3 measurements with the bulb in circuit. You'll likely get something very close to: L--N 240v N--E 0v L--E 240v If this is the case, you can safely strap N to E with something having a much lower impedance than a lightbulb. My genny has 2 x 13A sockets. I have made up a plug which has an internal wire between N and E, and that is plugged into one of the sockets - with the other socket being used for the real output. The genny runs perfectly happily. I haven't yet tried powering my boiler with it (preferring to wait for warmer weather, when the boiler is less critical) but I have every confidence that it will work. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#3
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Generator and boiler lockout revisited
"Roger Mills" wrote in message ... In an earlier contribution to this discussion, Richard Walker wrote: Hi Thanks to those who replied to my posting on this a few weeks ago in which I said that ch boiler locks out when I run it from a petrol generator supply Sparks: you suggested I measure voltages as generators are often centre tapped. Results (no load) are - L--N 240v N--E 85v L--E 85v I am now more puzzled than ever. Where's my missing 85v? The output is probably floating - with no electrical connection to earth - and what you're measuring is probably just an induced voltage. Chances are that you can actually strap N to E with no ill effects. Try this: Connect a mains 100w bulb between N&E and see whether it glows at all. Assuming it doesn't (mine didn't!), repeat the above 3 measurements with the bulb in circuit. You'll likely get something very close to: L--N 240v N--E 0v L--E 240v If this is the case, you can safely strap N to E with something having a much lower impedance than a lightbulb. My genny has 2 x 13A sockets. I have made up a plug which has an internal wire between N and E, and that is plugged into one of the sockets - with the other socket being used for the real output. The genny runs perfectly happily. I haven't yet tried powering my boiler with it (preferring to wait for warmer weather, when the boiler is less critical) but I have every confidence that it will work. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! Agreed, My generator has the E and N bonded together, so I get E-N - 0 L-N - 230 L-E - 230 I have also installed a Briggs&Stratton transfer switch in the house. (This has a 30mA RCD in it. Before I installed the generator, we have a fair few power cuts. Afterwards, we have had two short ones in 3 years, and these were both on the same day, about 2 weeks ago!!! Bloody typical isn't it! Sparks... |
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