So it's the same as with poles. I asked someone why the conductor lowered
the rear pole before the driver raised the front one when changing ends -
which plunged the car into darkness at night - I was told it was to avoid
bridging an SI in case there was an earth fault on the section beyond it,
and because of the danger of the pole being raised flying up and contacting
the steelwork of an over bridge.

On Wed., 9 Jan. 2019, 21:25 'Richard Youl' via TramsDownUnder < tramsdownunder@... wrote:

> As the length of the insulating material in the centre of the SI is

> greater than the length of the pantograph head to avoid bridging the two

> sections, it is necessary to cut power to avoid an arc which burns the

> insulating material and adjacent metal.

>

> Regards,

>

> On 9 Jan 2019, at 7:48 pm, Ronald Besdansky shrdlu.junction@...>

> wrote:

>

> Are drivers still required to cut-off at section insulators and

> H-crossings?

>

> I remember Green Men noting down the numbers of trams drawing an arc as

> they crossed Swamston St in Collins St - not wanting to lose momentum for

> the climb beside the Town Hall?

>

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