Three detection methods of nailing to avoid wires in the wall

In home decoration, the accident rate of electric shock and tripping caused by accidental injury of wires by nailing is as high as 37%. Based on electrical standards and practical experience, this paper explains in detail three professional methods for accurately detecting wires in walls to help you construct safely.

Method 1: hydropower drawing positioning method (accuracy 95%)

The hydropower construction drawing provided by the decoration company is the core basis:

Measurement and positioning: mark the horizontal/vertical extension area on the wall according to the pipeline position marked on the drawing with a tape measure.

Safety scope: Take the socket as the center, and avoid the "high-risk area" of 15cm from top to bottom, left and right.

Remedy for missing drawings: If the drawings are lost, you can contact the original decoration company for electronic filing.

Method 2: Instrument detection method (accuracy 80%-99%)

2.1 Professional wall detector

Working principle: detecting metal pipelines by electromagnetic waves.

Key points of operation: move along the wall at a uniform speed, and stop immediately in case of alarm sound (detection depth reaches 8cm).

2.2 non-contact measuring pen

Economic scheme: Suitable for thin wall inspection.

Operation skill: drill a 3mm shallow hole at the pre-nail position, and insert an electric pen to test whether it is charged.

Method 3: Empirical judgment method (accuracy 70%)

When tools are lacking, risks can be avoided according to the wiring rules:

Avoid "cross area": 30cm above and 30cm below all socket switches, and extend horizontally.

Listen to the sound and identify the position: tap the wall with a metal tool, and the hollow sound area may be wired.

Observation of cracks: 10cm along the longitudinal cracks on the wall surface (mostly at the slots of buried pipes) are prohibited from nailing.

Gold standard of safe construction

Power-off operation: power off the corresponding circuit before construction.

Layered drilling: drill a 2cm shallow hole for detection, and then go deep after confirming that there are no wires.

Emergency treatment: If plastic chips (pipes) are drilled, stop drilling immediately, and then operate when the deviation is ≥5cm.

Tool selection guide

Tool Type Applicable to Scene Accuracy Cost

Water and electricity drawings New house/with archive decoration

Wall detector old house/complex line

Simple suspension operation of contactless electric pen

Keep in mind that the three steps of "inspection, measurement and inspection" can reduce the risk of electric shock by 90%! It is recommended to collect this article and forward it to friends who are decorating.