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    KVA Calculation

    You're right for 400V. Apparent Power (in VA) = 1.73 * Current (in Amps) * Potential Difference (in Volts).
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    wiring a pbx system advice..........

    Screwfix and fleabay have 12 wall mount patch panels, but these have cables terminating on the back of the modules so are a bit deeper.
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    wiring a pbx system advice..........

    Yes, you have it more or less correct, but the adapters need to be plugged into the RJ45 wall sockets near the handsets. The PABX end of the Cat6 cable will need to be terminated onto RJ45 punch down blocks. With 12 extensions you would be better using a patch panel rather than individual RJ45...
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    25A rated timer for electric boiler

    A - Z Electrics has now made it as far as C. (for Contactor) :-) (Sorry A-Z, couldn't resist.)
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    Replacing MCB's - Part 'P' notifiable?

    Replacement with the same rated item as a repair is not notifiable, but replacing an MCB with a higher rated item as part of a planned piece of work would be notifiable as it's not in the list of work that need not be notified in Part P. (Arguing that an MCB is an item of fixed electrical...
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    Linear actuators for model control

    You can get linear actuators designed to be plugged straight into the RC Receiver. Unfortunately, they are not cheap, e.g. Linear Actuator L12-50-100-06-R If the model is worth a lot, a professional linear actuator might be safer! I can't help with a cheap Receiver-controlled switch to keep...
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    Busness Partner Wanted - PV/Solar

    On the other hand, NigelB only needs one partner. Someone on the forum may be struggling with the sort of areas that NB can help with. A bit of ad-hoc work could be exactly what is needed for both parties to get the feel for what each can offer, and whether working together over the longer-term...
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    Need Help In Chandelier Installation.....

    Much more environmentally friendly to install a light tube! Skylight Tubes | Solar Pipes | Solatube®
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    how to measure csa

    Re: how to measure csa - stranded conductors If you measure the diameter of three strands at three different positions around each strand, and use the average, you will be much less likely to arrive at a calculated CSA that is very far away from the true CSA.
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    UPS supply

    Has the client asked for an external maintenance by-pass? (They need one, but it needn't be the expensive, matching, Eaton one). Ideally the by-pass should rated to the max current that the supply cable will carry, to allowing additional UPS units to be added without having to uprate the...
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    PIR Miscoding - how to remedy

    The ECS Guide seems to make it clear to me (at least) that Code 2 are for issues of potential safety to users of the electrical system (or the occupiers of the property). Issues of safety for subsequent electrical contractors & householders working on the electrical installation (e.g. labeling...
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    PIR Miscoding - how to remedy

    Following on from the thread about "PIR Code 1s and am I being scammed", where the requester of the PIR believes that a fault has been coded incorrectly, what can be done about it? It is reasonable to discuss with the electrician and ask for the report to be re-issued? If the electrican won't...
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    Smoke Alarm minimum dBA

    It would be really useful when replying to such a question to provide a reference to the answer so that the questioners can be certain of the authority of the answer.
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    How to convert customer to board upgrade

    You could play up the safety angle for children, or if the customer is older , grandchildren who may come to visit. The Plug into Safety Leaflet is still available online. http://www.esc.org.uk/fileadmin/user_upload/documents/public/plug_into_safety/Electrician_Downloadable.pdf
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    Frequent PIRs - any evidence of benefit?

    Thanks IQ, that's what I was looking for; some real work experience.
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    DIY job

    Bear Conductor?
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    Frequent PIRs - any evidence of benefit?

    While tony mc's reference to a domestic PIR catching a very serious fault was interesting, it does not reflect my original question which was about whether very regular monitoring and trend analysis on measured values was of benefit.
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    Frequent PIRs - any evidence of benefit?

    Is anyone aware of any evidence that performing very regular PIRs, e.g. yearly, is of any benefit? Are there any trends that could usefully be determined from the measured values on the PIR? Thanks
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    Argument FOR Periodic Inspections for Landlords.

    As a landlord, perhaps I can provide some insight; Landlords are concerned with maximising Income and minimising Expenses. Landlords realise that they only pay tax on the difference, but while expenses do drive down the tax burden, they never come free as gmchris suggests. Income is maximised...
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    odd pir advice

    I'm also a pilot, and while pilots do 'kick the tyres' and the passengers are quite happy that they do, it is the case that the pilot is only doing a visual inspection and cannot determine the airworthiness of the aircraft from the visual inspection alone. It is the overall maintenance process...

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