P For coiled prestressing tendons, after uncoiling a length of wire or strand the maximum bow height shall comply with en 10138 unless given in an appropriate European Technical Approval.
A joint. It is set at the connection of the cover head of core with power supply wire to cover the plastic casing of electric connection of copper strand and power supply wire.
Prestressed steel wire and strand for bridge are used in the condition of high alternating stress with humidity atmosphere and sometime seawater atmosphere, which speed up the corrosion.