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The Weekend Quiz. 6th April 2019. Electric Pressure.

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"Pressure in mains during supply. During the whole of the period when a supply of energy is required to be maintained by the Undertakers in the distributing mains under and these regulations........"


"Undertakers to Provide Constant Supply. From and after the time when the Undertakers commence to supply energy through any distributing mains, they shall maintain a supply of sufficient power for the use of all the consumers for the time being entitled to be supplied from such main...."


"Declared  pressure at consumer's terminals.  The pressure so declared at any pair of consumer's terminals shall not, except by agreement, be greater than 115 volts or less than 45 volts".


Q.1. Where do these requirements come from?


Q.2. From which period do these requirements originate?


Q.3. Dr. Matthiessen's experiments produced a table of what B.A. specifics?


Z.


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  • 0
    Answer.


    The info that I obtained was from a little pocket book entitled "Munro and Jamieson's Pocket Book of Electrical Rules and Tables. Eleventh Edition. Charles Griffin and Company Ltd. 12Exeter Street, Strand London 1895.


    The book is advertised for use by Electricians and Engineers. By James Munro C.E. and Andrew Jamieson, M. Inst. C.E. F.R.S.E.


    Matthiessens's Experiments were shown as tables of Specific Resistance in B.A. units of Metals and Alloys at 0 deg. C. A B.A. unit = 0.9889 legal Ohm. (B.A. Standards Committee of 1892, part of the Board of Trade).


    Columns showed of wire 1 foot long weighing 1 grain, and


    resistance of wire 1 metre long weighing 1 gramme, and


    resistance of wire 1 foot long 1/1ooo inch diameter, and


    resistance of wire 1 metre long 1mm in diameter, etc.


    Ref. Q.1. The quotations come from Board of Trade Regulations &c, for Safety and Supply of Electrical Energy (Lighting Order 1889).


    Z.


Reply
  • 0
    Answer.


    The info that I obtained was from a little pocket book entitled "Munro and Jamieson's Pocket Book of Electrical Rules and Tables. Eleventh Edition. Charles Griffin and Company Ltd. 12Exeter Street, Strand London 1895.


    The book is advertised for use by Electricians and Engineers. By James Munro C.E. and Andrew Jamieson, M. Inst. C.E. F.R.S.E.


    Matthiessens's Experiments were shown as tables of Specific Resistance in B.A. units of Metals and Alloys at 0 deg. C. A B.A. unit = 0.9889 legal Ohm. (B.A. Standards Committee of 1892, part of the Board of Trade).


    Columns showed of wire 1 foot long weighing 1 grain, and


    resistance of wire 1 metre long weighing 1 gramme, and


    resistance of wire 1 foot long 1/1ooo inch diameter, and


    resistance of wire 1 metre long 1mm in diameter, etc.


    Ref. Q.1. The quotations come from Board of Trade Regulations &c, for Safety and Supply of Electrical Energy (Lighting Order 1889).


    Z.


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