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电位差
Where any rails on which cars run, or any conductors laid between or within 1 m of such rails, form any part of a return such part may be other returns or parts of a return shall be insulated, unless of such sectional area as will reduce the difference of potential between the ends of the uninsulated portion of the return below the limit laid down in rule 9.
We've paid with points with the many mistakes that we were making but, you know, we said we knew there was a difference of potential since the beginning of the season. We knew our second position last season was a fantastic achievement for us.
To ascertain the contribution of each individual source, all of the other sources first must be "turned off" (set to zero) by: Replacing all other independent voltage sources with a short circuit (thereby eliminating difference of potential i.e. V=0; internal impedance of ideal voltage source is zero (short circuit)).
When the return is partly or entirely uninsulated a continuous record shall be kept by the company of the difference of potential during the working of the tramway between the points of the uninsulated return farthest from and nearest to the generating at any time such difference of potential exceeds the limit of seven volts, the company shall take immediate steps to reduce it below that limit.
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