Is the RVV power cable also called a cable?
Are you referring to the design of the length of the control cable reserved? Also refers to the number of cable cores reserved? Design the length of the reservation, the number of cores is also reserved.
Depending on the actual situation and design there is no future addition or function increase. If not increased or the second phase design should not be reserved, because the general integrated wiring warranty period is 20 years. If it is damaged during the warranty period, the construction unit is responsible for solving! Fiber is generally called spare. Not reserved! Prepare a 4-core and so on.
Must be reserved! Spare to stay, the normal use of the bad, spare can be used directly, such as fiber
