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What is this symbol from a single-line diagram of a switchboard?

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It looks like a circuit breaker or a junction box.

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It looks like a voltmeter selector switch (SS).

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Figure 1. Image source: Rayleigh.

This allows the use of one (single-phase) voltmeter, 0 - 800 V in your case, to monitor phase to phase and phase to neutral voltages.

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