When connecting power three-phase, single-phase and signal wires, errors are unacceptable. They can lead to malfunction of the equipment, the operation of grounding systems and electric shock to the maintenance personnel. Of great importance is the correspondence of the color marking of the cable to the connected circuits.
Necessary
Technical description of the cable
Instructions
Step 1
To identify wires by color in three-phase wiring, use the following rule.
The modern marking of three-phase cables is as follows: phases A, B, C, are marked respectively in white, black and red. The neutral wire is blue and the ground wire is yellow-green. In the marking of wires of a single-phase network, three colors are used: white - phase, blue - zero, grounding is indicated by a yellow-green wire.
Step 2
If you accidentally break the USB wire, repair it by following the following color-coding scheme: positive power corresponds to the red wire, negative power corresponds to black, white wire corresponds to negative data wire, and green wire corresponds to positive.
Step 3
The most complex wire colors in multi-core cables. For example, to quickly find the place of damage to the communications of the SBZPU or SBPU cables, it will be necessary to determine the integrity of the cores between adjacent branches of the trunk cable (as a rule, these types of cables are used on the railway). To clarify the color wiring of a specific cable brand, use the corresponding technical description.
Step 4
So, for example, if an open circuit occurs in the SBZPU or SBPU cable, then the color of the wire can be determined according to the following scheme:
Pair 1. The color of core B is blue, core A is white.
Pair 2. Color of core B - yellow, core A - white.
Pair 3. Color of core B - green, core A - white.
Pair 4. Core B color - brown, core A - white.
Pair 5. Core B color - gray, core A - white.
Pair 6. Core B color - red, core A - white.
Pair 7. Core B color - blue, core A - red.
Pair 8. Core B color - yellow, core A - red.
Pair 9. Color of core B - green, core A - red.
Pair 10. Core B color - brown, core A - red.
Pair 11. Core B color - gray, core A - red.
Pair 12. Core B color - red, core A - red.
