How to organize a temporary power supply at the construction site?

Electrical network requirements

First of all we provide requirements for temporary power supply of the site where construction works are performed:

1. Reliability of the .Uninterrupted supply of electricity for the construction period.
2. Quality of .Frequency and voltage must guarantee the operation of electrical devices.
3. Security .Maximum protection of personnel and operators on the construction site.

For this purpose, it is necessary to document the organizational aspects related to connecting to existing highways of sufficient capacity

. Organizational activities

. Depending on the location of the site on which the construction takes place, a method is selected for supplying temporary power supply. The following aspects influence the choice of the type of cable routing:

• Distance from objects and power networks.
• Type of property: residential building, storage space, or production hall.
• Type of electrification: on a permanent basis or temporary power supply.
• Declared power consumption, calculation methods for consumed energy.
• Reliability and power continuity.
• Network selection: single-phase or three-phase.
• Quality of the transit highway.
• The time for which permission is given and the connection is made to the network.

Based on these options, the best way to install temporary power supply at the construction site is chosen. This can be a connection to existing networks or the installation of an autonomous power generator. When state facilities are included in the network, electricity is provided on a temporary basis or a permanent electricity supply scheme.

Features of connection to existing electrical networks

The first situation that we will consider is the construction in the immediate vicinity of our own housing. The method of electrification from already registered input is considered to be less expensive and more preferable. For the period of construction work, electricity is consumed, which is already present at the facility and payment for it occurs in accordance with the previously concluded contract. This option is suitable for temporary power supply of a private house.

After the construction of a new facility and, possibly, the dismantling of old buildings, there will be a need to re-formalize the contract with the supplying organization.

To do this:

1. Specify the rated power consumption.
2. The organization obtains specifications and a connection point for input.
3. Order project documentation.
4. The project is coordinated with the state inspection.
5. Perform electrical work.
6. Call an electrical laboratory for evaluation and preparation of the test report.
7. Enter into an agreement with the power supply, put the facility into operation.

All regulatory documents are provided on the photo:

Please note, in order to make temporary wiring, you will also need to issue this package of documents.

In cases where the construction site is located away from power lines, it will be necessary to build a new overhead line( or cable laying) and to complete all documents described earlier for the electrification of the construction site.

Entry to the object must be done, both for permanent operation. To do this, it is necessary to install an external anti-vandal shield with protection class IP54.The box is sized so that the meter and protection devices, sockets and grounding buses can be installed. Also need to provide a place for backup power supply.

When building within a non-profit partnership, the cost of services for collective connections is much cheaper than summer, horticultural and garage cooperatives. They have a transformer substation, to which it is possible to connect. Many teams have already settled and formed. Repair and modernization of equipment was carried out at their expense, installation of supports, transformers, laying VL.Newly appeared developers can present monetary compensation from already performed works and carried out modernization of a part of the equipment.

Another situation that I would like to consider is a temporary power supply of a private house from neighbors. If the electrification is being debugged from independent of you, and the deadlines are tight, then it's worth negotiating with the neighbors. If such a kind person was found, an additional meter is connected to the power supply for the period of repair and construction. The size of the released power( control of the meter) and the installation of the protective restricting device are stipulated in advance. In this way, it is easiest to make a temporary posting to the site.

By the way, I would like to depart a little from the topic and invite you to familiarize yourself with the ways of temporary power supply of the apartment. Find out what can be done if you turn off the light in the apartment for non-payment.

Separately, we need to consider such a method of supplying electricity as an electrical generator. From a technical point of view, generator sets provide high-quality electricity. Builders use them at their own discretion and do not depend on anyone. The disadvantage is the high cost of electricity produced. This kind of supply is mostly used at the beginning of construction, when there was a hitch in the provision of documents with temporary supplies.

Technical activities

After solving all organizational issues and choosing a temporary power supply scheme at the construction site, the place for installing the input board on the rack or support is determined. Also, an additional support is installed in case the distance from the power line is more than 25 meters. By rules, the entry board is installed on the applicant's border or territory. From the input box is already made the marking of cable routes or poles to the place of work, power and lighting networks. For optimal distribution of power through the building site, power wires are led to lifting mechanisms, to the concrete preparation site, to the wood processing site, to the place where the welded work is done.

At the beginning of construction, the temporary lighting system can consist of several floodlights, and will be divided into main and emergency, local or general. You can find out more about the types of lighting in our separate article.

Connection diagrams of consumers

During the construction of the building, cable routing routes appear, the type and length of the cable, the characteristics of the loads are indicated, and a scheme for their inclusion is created. The connection scheme can be radial, annular, mixed wiring. Radial power is supplied from one input, from which cables are distributed to power posts and lighting installations. In the event that the developer has a backup generator, the temporary power supply scheme will be ring or mixed type. The radial circuit is duplicated by the connection diagram from the generating set. This type of supply allows you to continue building with possible power failures.

Input structure

In one of our articles, we already talked about the self-assembly of a three-phase shield in the backyard. The technology of assembling this shield differs little, we recall important points.

The meter and protection devices, such as a circuit breaker, RCD must be in a sealed box, which prevents moisture and foreign objects from entering. It is also necessary to organize a grounding device and ground the shield. Take all security measures for the work.

Cable laying is possible both in trenches, in places where it will not experience loads from vehicles passing through it, or by hanging it on a cable at a safe height. We recommend to study the technology of installing cable wiring in the country.

Security measures

Construction is always a movement and movement, as a result of which unforeseen risks can arise. Therefore, special requirements are imposed for temporary electricity supply, since there is such a factor as the adverse effect of the atmosphere on the elements of electrical installations and their parts. Adjacent workers with a low tolerance group, or without qualifications, the presence of combustible and corrosive materials at the construction site, the lack of grounding and the equipotential bonding elements in electrical appliances.

When working in high humidity conditions, it is necessary to follow the current rules of PUE 1.7.53, prescribing protection by the RCD installation, with indirect contact in cases where the voltage exceeds 50 volts AC and 120 DC.Also, to improve the safety of personnel working with power tools, it is necessary to use isolation transformers with a potential equalization system that combines all open housings with protective connectors in the socket.

When lighting an object, the luminaires are chosen with IP54 protection class, for installation in the open air. Following our recommendations and the current rules of the PUE, you will reduce the risks of injury to a minimum. Take care of yourself. Finally, we recommend that you watch a video that shows the shield for temporary supply of electricity to the site:

That's all I wanted to tell you about what is the temporary power supply of the construction site and what requirements are imposed on it. We hope these foundations were useful and interesting for you!

It will be interesting to read:

• How to carry light from the post to the house
• Installing the electrical wiring in the newly built house
• How to write an estimate for the electrical work