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The conductor put the trolley pole onto the wire, and as the tram moved forward the conduit channel veered sideways to outside the running track, automatically ejecting the plough - the tram was said to be 'shooting the plough'. At the changeover from overhead wire to conduit the process was a little more complicated.
The primary distribution wires use the three-phase system. Main distribution lines always have three 'hot' wires plus an optional neutral. In the North American system, where single-phase transformers connect to only one phase wire, smaller 'lateral' lines branching off on side roads may include only one or two 'hot' phase wires.
A vault is often accessible directly from a street, sidewalk or other outdoor space, thereby distinct from a basement of a building. [1] [2] Utility vaults are commonly constructed out of reinforced concrete boxes, poured concrete or brick. Small ones are usually entered through a manhole or grate on the topside and closed up by a manhole cover.
In HVDC systems typically two conductors are carried per line, but in rare cases only one pole of the system is carried on a set of towers. In some countries like Germany most power lines with voltages above 100 kV are implemented as double, quadruple or in rare cases even hextuple power line as rights of way are rare. Sometimes all conductors ...
Pole Vault was the first operational tropospheric scatter communications system. It linked radar sites and military airfields in Greenland and eastern Canada by telephone to send aircraft tracking and warning information across North America.
The Division II pole vault national champion knew from others’ horror stories that a dwindling number of airlines were still willing to carry poles and that they were too long and cumbersome to ...
Technicians require access to connection points. Placing such a point underground (e.g., in a utility vault) is expensive, so pedestals are preferred when they are an acceptable choice. Pedestals are used for CATV (known as a cable box in such a situation), telephone, passive optical networks, and other telecommunications systems.
“When you’re pole vaulting, not only do you need the height, but you need the depth,” he says. “You have to go deep enough to get over the bar. It’s very common in the vault, you’ll ...