The search tool seems useless on my IPad so forgive me for asking something that has likely been answered before. Why is voltage drop restricted to 3% while other loads are allowed 5%?
Was the office in the City of London ? If so then public lighting is often controlled by the Thorn cyclocontrol system.
This uses equipment located in the DNO substations that imposes coded pulse signals on the mains.
Public lighting is controlled by a receiver that detects these signals and switches the lamps. This has advantages over the more commonly used photocells.
All lights can be turned in daylight to test them.
All lights can be turned of at night to facilitate filming.
Street signs, Christmas lighting, and illuminated road signs may be separatly controlled.
Half lighting for part of the night may be selected.
Operation unaffected by tall buildings shading the photocells or by extraneous lighting falling thereon. This is of particular importance in the City, where by long tradition the street lights are affixed to buildings and not supported on posts or columns.
These pulses have considerable energy and can produce noticeable lamp flicker. The equipment can absorb 100 kw, though only for a fraction of a second.
Was the office in the City of London ? If so then public lighting is often controlled by the Thorn cyclocontrol system.
This uses equipment located in the DNO substations that imposes coded pulse signals on the mains.
Public lighting is controlled by a receiver that detects these signals and switches the lamps. This has advantages over the more commonly used photocells.
All lights can be turned in daylight to test them.
All lights can be turned of at night to facilitate filming.
Street signs, Christmas lighting, and illuminated road signs may be separatly controlled.
Half lighting for part of the night may be selected.
Operation unaffected by tall buildings shading the photocells or by extraneous lighting falling thereon. This is of particular importance in the City, where by long tradition the street lights are affixed to buildings and not supported on posts or columns.
These pulses have considerable energy and can produce noticeable lamp flicker. The equipment can absorb 100 kw, though only for a fraction of a second.
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