Recent content by Carl S

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    STANDING ON THE SHOULDERS OF GIANTS - BRUSH

    Good memories of Brush gear up until the last switchboard. Contractors put the board in and two of us for the company inspected it. The result, a check list of abysmal failures. The board was replaced with a GEC unit.
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    Hot SWA gland

    Only one end of the singles should be earthed. It’s usual to use a Paxoline gland plate at the switchgear.
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    Will 208 volts be enough?

    208V is within the band of permissible voltage variants. Now a question for you, is the equipment 50 or 60Hz?
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    Nerves

    Nerves calm down as experience grows. However don’t become complacent, that’s when things go wrong and cause you to loose face.
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    Glasses

    I'm long sighted in one eye, short in the other. Fun and games if you get the lenses in the wrong eye.
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    Circuits for Motors- how to in the UK?

    Scott T transformers (2 phase) are still used on the railways for 25kV OH supplies.
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    When did they stop using imperial cable?

    1970 was the official date but it could be years either side. As an apprentice I was using imperial cable, we weren't clearing the stores because of an EU dictate.
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    Parts for vintage service station lights..

    I made light fittings using gas pipe. A local machine shop made conduit to gas pipe adaptors for me for about £1-50 each. Marvo did the same a few years back as I recall.
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    New breakers or add a sub panel

    AHJ inspectors have the final say. Talking to them first makes sense to me. I’m a retired industrial engineer with an interest in international regulations/codes.
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    New breakers or add a sub panel

    Before you or your licensed electrician do anything talk to the AHJ. Some panels will take a double lug making a sub panel easy. If the AHJ red tags the install it’s going to cost a lot more.
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    Any ideas how to solve this?

    Capillary action will draw water from a nick in the outer serving to the termination glands. I wish you the best of luck finding the ingress point.
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    Unskilled management v skilled knowledge

    I spent much of my time before I retired behind a desk pen pushing and I hated it. OK I was doing mainly R&D (wreck and destroy) work which was interesting. Learn how the process works before telling someone else how to do their job.
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    Disconnect, grounding and mechanical protection requirements when bringing power to a chicken coop...

    Have a look at section 250 in NFPA-NIC 2017 Areas with any livestock require special attention to earthing. Ufer or peripheral earthing would be my choice.
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    Lost Neutral Voltage Calculation

    The old way is to draw out the vectors. There’s probably an “App” on your phone by now.
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    Chance to see some working Mercury Arc Recifiers in London

    There was a working 250kW MAR in the science museum electricity hall. Fantastic things to see working, a bit daunting to work on.

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