Wires, like pipes and other building materials, do not need to be replaced frequently during normal use. Generally, the decision to replace the wires is only considered during a second renovation - there are many users who do not replace the wires during the second renovation.
The old national standards stipulated that the lifespan of wires and cables should be no less than 20 years - the new national standards have been upgraded again, changing the lifespan requirement to no less than 70 years. In other words, as long as the wiring is laid according to the specifications during the renovation, the lifespan of the wires can be almost the same as the lifespan of the renovation. However, this does not mean that the wires can never be replaced. When the following three situations occur, it is necessary to consider replacing the wires.
Quality issues. The national standards are good, but unfortunately not all products are qualified. Once we buy inferior wires, the troubles we encounter are endless: a slight damage to the insulation layer causes leakage; a slight break in the conductor leads to overload; a slight adhesion at the connection point causes short circuit... Occasionally, a few line failures can be considered as coincidence or bad luck. But if the lines frequently fail (with 1-2 failures per year), we will have to suspect the quality problem of the wires. At this time, the entire house needs to be replaced with wires - the triggering of line failures and the causing of troubles for users is only one aspect. If the protection device fails, it may cause electric shock, burn the equipment or cause a fire.
Selection cannot meet the requirements. With the increase in the number of household appliances, the selection of wires is also changing - imagine a few years ago, 1.5 square copper wire and 2.5 square copper wire were commonly used in home renovations. But today's home renovations rarely use 1.5 square wires, and instead, 4 square or even 6 square wires are widely used. The future is unpredictable, who knows if the current line current will increase (according to the current development direction, the line current will only increase), or decrease (the crazy research on environmentally friendly appliances may lead to a decrease in the line current in the future), or even no longer need wires.
What we can do now is at most choose the best configuration available today - whether this configuration can meet the needs for the next few decades is uncertain. So, if the current wire selection cannot meet the requirements on a certain day in the future, we need to replace the wires again.
Quantity cannot meet the requirements. On one hand, it is the number of electrical devices (the number of switches and sockets), and on the other hand, it is the number of circuits (each switch in the distribution box is a circuit). When the quantity cannot meet the requirements, it is necessary to increase or replace the wires.
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