【HaiChuan Chemical Engineering Discussion Forum】How to calculate the length of electrical cables

When calculating the costs for installation work, have you calculated the reserved length of cables correctly? 2019-07-31 19:15·In the measurement of general installation work for energy conservation 120, the calculation of cables involves more than just determining the total length of the cables. Below are the regulations for calculating cable length properly. (Reserved length + total cable length) * (1 + 2.5%) When calculating the costs for installation work, have you calculated the reserved length of the cables correctly? High energy ahead – pay attention to the following 12 points (memorize them, as they will be tested): When calculating the costs for installation work, have you calculated the correct length of cable to be reserved? 1. During the installation of cables, whether they are laid in ducts or within cable trays, the cables are not in a completely straight position. Its calculation must be: (total length of all cables + reserved length) * 1.025. 2. The cable enters the building. Primarily, when municipal road external cables (or traffic safety project cables) enter the site, it is necessary to take into account a minimum reservation distance of 2 meters. 3. When the cable enters the trench or is led up (down) via a hanger, a minimum clearance of 1.5m should be reserved. 4. For the incoming and outgoing lines of the substation, a minimum reserve of 1.5m should be considered. 5. For power cable terminations, a minimum length of 1.5m should be reserved. 6. Leave 2m at each end of the cable splice box. 7. Cables lead to control and protection panels, analog panels, distribution boxes, etc. By panel surface (or box surface): height + width. 8. For high-voltage switchgear and low-voltage distribution panels and boxes, allow 2 meters of space for incoming and outgoing cables below the panel. 9. Cable to motor. Start from the motor junction box +0.5m. 10. Station service transformer. Start from the floor level and add 3m. 11. The length increase due to the cable bypassing beams, columns, etc., is calculated based on the cross-sectional dimensions of the object being bypassed. 12. The fixing points between the elevator cable and the cable tray should be spaced 0.5m apart.