Lightning protection and grounding systems

How to make an estimate for grounding and lightning protection

When carrying out electrical installation work at various industrial and public facilities, when installing complex high-voltage equipment, switchboards, consoles, control cabinets, etc. Usually it is necessary to prepare an estimate for the installation of grounding and lightning protection systems. Prices for grounding cabinets and other electrical equipment may be included in the “Power supply” section or included in a separate estimate (local estimate). It is worth noting that most prices for the installation of electrical appliances from Part 8 “Electrical installation work in electrical installations”, incl. switchboards, control cabinets, circuit breakers, relays, disconnectors, transformers, capacitors, etc., include grounding and connection to grounding buses in the list of work performed. Thus, it is necessary to estimate grounding work only if there are specific volumes in the work sheet, for example:

— installation of a vertical grounding conductor – 20 m;

— installation of horizontal grounding conductor – 100 m;

— laying of wire PV3 of various sections, yellow-green;

— installation of a grounding conductor made of round steel.

Let's consider the list of works and material resources that are included in the prices for grounding:

— price FERM (TERM, GESNm) 08-02-471 for the installation of vertical grounding conductors made of angular and round steel in the example estimates. This standard provides not only for installation, but also for the production of grounding conductors, thus, the costs of cutting steel structures to specified dimensions do not need to be taken into account additionally. Digging a hole along the ground electrode, on the contrary, needs to be priced additionally, since the price takes into account only its deepening and welding.

— the price of FERm (TERM, GESNm) 08-02-472-10 for laying a conductor up to 25 mm2 provides not for the manufacture, but for the installation of fastening parts (dowels and screws with a drill), the layout of wires and connections. Some estimators use this rate to estimate the laying of PV3 wires of various sections (yellow-green).

The estimator has to inspect the lightning protection device much less frequently than the grounding. In the example of the estimate calculation, which is offered for your consideration, the lightning protection device is carried out in the form of installing steel structures of lightning rods on a reinforced concrete foundation and pulling conductors to the supports.

Features of the estimate for lightning protection

Estimates for installation of lightning protection can be of two types:

• comprehensive – compiled for objects as a whole. For example, for an industrial enterprise, a low-rise village;
• local - compiled for individual elements of the facility - houses, industrial workshops, structures.

The document usually includes several sections:

• name of materials - units of measurement, price per unit, total quantity and total cost are indicated;
• general construction work - for example, excavation, backfilling of trenches. The price per square or linear meter, the specific scope of work and the total cost are indicated;
• installation work. For example, installing an air terminal, installing grounding, connecting to a down conductor, installing internal devices. The cost per installed unit (meter, piece, set), the volume of work, as well as the total cost for a specific type of work are indicated.

Grounding of some electrical equipment can be taken into account in a general document or included in a local estimate, since grounding work is carried out more often than the installation of lightning protection in general.

An example of drawing up an estimate for the installation of grounding and lightning protection in the TER database of the Krasnodar Territory

How is grounding installed and how much does it cost?

Installing grounding in a private house is not very complicated, but it must be carried out by specialists. For someone who does not have the necessary knowledge and skills, the circuit may not work. When creating a contour, it is important to adhere to the following requirements:

• The distance from the supporting structures to the electrode must be at least one meter
  .
• The immersion depth of the circuit, which is made from rolled metal (strips, pipes, angles, wires), must be at least 2.5-3 meters.
• The side of the triangle should be from one and a half to three meters.
• The harness is made from a 4*40 mm steel strip and is buried half a meter into the ground.

Cost of installing a ground loop

For industrial facilities

The cost of work and materials is calculated individually and depends on the size of the building and the requirements for installed equipment.

When carrying out electrical installation work at various industrial and public facilities, when installing complex high-voltage equipment, switchboards, consoles, control cabinets, etc. Usually it is necessary to draw up an estimate for the installation of grounding and lightning protection systems

. Prices for grounding cabinets and other electrical equipment may be included in the “Power supply” section or included in a separate estimate (local estimate). It is worth noting that most prices for the installation of electrical appliances from Part 8 “Electrical installation work in electrical installations”, incl. switchboards, control cabinets, circuit breakers, relays, disconnectors, transformers, capacitors, etc., include grounding and connection to grounding buses in the list of work performed. Thus, grounding work needs to be assessed only if there are specific volumes in the work sheet, for example:

Installation of vertical grounding – 20 m;

Installation of horizontal grounding conductor – 100 m;

Laying of wire PV3 of various sections, yellow-green;

Installation of a round steel grounding conductor.

Let's consider the list of works and material resources that are included in the prices for grounding:

Cost of FERM (TERM, GESNm) 08-02-471 for installation of vertical grounding conductors made of angular and round steel in example estimates

. This standard provides not only for installation, but also for the production of grounding conductors, thus, the costs of cutting steel structures to specified dimensions do not need to be taken into account additionally. Digging a hole along the ground electrode, on the contrary, needs to be priced additionally, since the price takes into account only its deepening and welding.

Price FERM (TERM, GESNm) 08-02-472-01 (-02, -03, -04, -05) for the installation of a horizontal ground electrode in the example estimates

similar to vertical;

In the price of FERm (TERm, GESNm) 08-02-472-06 (-07, -08, -09) for installation of a grounding conductor on building foundations

not only the conductor itself is manufactured, but also the fastening parts to it, as well as protective boxes;

The price of FERM (TERM, GESNm) 08-02-472-10 for laying a conductor up to 25 mm2 does not provide for the manufacture, but for the installation of fastening parts (dowels and screws with a drill), the layout of wires and connections. Some estimators use this rate to estimate the laying of PV3 wires of various sections (yellow-green).

The estimator has to inspect the lightning protection device much less frequently than the grounding. In the example of the estimate calculation, which is offered for your consideration, the lightning protection device is carried out in the form of installing steel structures of lightning rods on a reinforced concrete foundation and pulling conductors to the supports.

Quick chat

Dear Svetlana, you are setting up not interconnected devices, but a functional group of the control and regulation system Department 9 Section 2.

Thanks for the answer, Konstantin

is there a link to the regulatory document?

Regulatory documents: technical part FERp01, reference book on electrical engineering

Good afternoon what category of complexity of the ventilation system using a multi-channel flammable gas alarm, section Instrumentation and A

1.2.1. FERp collection 2 of department 1 applies to: automated process control systems (APCS); centralized operational dispatch control systems; control and automatic control systems for fire extinguishing and smoke protection; telemechanical systems. Is your ventilation part of one of these systems? If it is not included, then it is assessed according to FERp01. The category of technical complexity of systems is determined according to “Appendix 2.1” of those parts of FERp02. The main point in defining the category is the presence of programmable logic controllers (the brain of the system). The brain of the system is programmed 2 cat., otherwise 1 cat.

The brain is programmed. And those part of the collection M10 p 1.10.115 costs for installation of equipment (except for sensors) of fire alarm systems based on a programmable logical station (monitoring and control panel) or automated workstation (automated workstation) using a personal computer, determined by GESNm collection 11 “Instruments, automation and computer equipment”, as well as the costs of testing the specified fire alarm systems based on a programmable logical station or automated workstation as a whole, determined according to GESNp collection 2 - according to the standards for systems of category I technical complexity (Table 02- 01-001).

Dear Lyaisan, what is the question, is the answer. You didn’t indicate that you have an alarm system and ventilation is included in the fire alarm system design. If so, then above, you have defined the category of those. complexity of the system, it belongs to 1 cat. and the sensor cannot affect the upgrade of the category, as stated in the technical. parts of FERm10. Or is there something else you haven't indicated?

Dear Lyaisan, even if this is a typo, it (the typo) was approved by the government of the Russian Federation and included in the federal register of estimate standards, which means it is legal and there can be no other explanation.

I completely agree with you

Good afternoon help with prices for Dorhan barrier repair (disassembly, adjustment, assembly of the interface unit, installation of the unit heater, replacement of radio key fobs)

Dear Tatyana, FER collections do not provide for repair work on barriers. The prices for the collections are based on the installation of finished products; you can either install the finished product, which takes into account setup and adjustment, or dismantle it. What is an interface node? Is this the mechanical or electrical part of the barrier? If it is an electrician, then indicate the brand of the devices; barriers are produced by different companies and their fillings are different.

Dear Oksana, based on your markings in search engines (Internet), it is impossible to unambiguously determine the type of components, I will say in general phrases: the installation of a vortex flow meter is assessed according to the table FERm11-02-022-XX, where XX is the nominal diameter; installation of additional supporting structures to support converters should be used FERm11-01-001-ХХ; installation of butt welded flanges, according to table FERm12-12-001-XX.

Source

Grounding

Grounding – designed to protect a person from electric shock and connects a device, equipment, structure, etc. to a grounding device. In turn, a grounding device is a system of grounding conductors and ground electrodes connecting the ground to electrical installations, devices, and structures.

When constructing any objects, it is necessary to carry out grounding; let’s look at the prices in the construction and installation collections of estimate programs.

In order to ground devices, electrical installations, structures, etc., we need to make a grounding device: it consists of a grounding loop and grounding conductors.

The grounding loop is made in the ground - for this we need to prepare a trench for the loop and accordingly we apply the prices from the first collection for earthworks; a standard trench for laying a grounding loop has dimensions of 200 mm x 700 mm. Depending on the volume and grounding plan of the adjacent territory, the development of the trench is carried out with an excavator (bar) or manually, install vertical grounding conductors and horizontal ones, most often for vertical grounding conductors, angle steel from various manufacturers is used with dimensions of 50x50 mm and 63x63 mm, round steel with a diameter of 12 mm to 20 mm, for a horizontal grounding conductor (grounding bus) a strip of 4x40 mm, 5x40 mm, 4x25 mm is used.

According to the PUE, the depth of the horizontal grounding conductor (grounding bus) is 0.5-0.7 meters and at a distance of 0.8-1 meter from the foundation or base of the equipment. Vertical grounding conductors should be 3-5 meters long.

Also, structures, equipment, machinery, etc. are grounded inside premises, buildings, production workshops, etc. of buildings and structures. The grounding conductor is laid along the structures. For this, a strip of 4x40 mm, 5x40 mm, 4x25 mm, copper wire of various sections, or the 5th core of the cable is used. Wire grounding is used for grounding structures and equipment. All data must be recorded in the design documentation, defective statement or statement of quantities.

Also, you may need:

The company's clients who have ordered grounding services also order:

• Installation of power supply management system
• Power equipment
• Installation of electric lighting system
• Installation of an uninterruptible and backup power supply system

When carrying out electrical installation work at various industrial and public facilities, when installing complex high-voltage equipment, switchboards, consoles, control cabinets, etc. Usually it is necessary to draw up an estimate for the installation of grounding and lightning protection systems

. Prices for grounding cabinets and other electrical equipment may be included in the “Power supply” section or included in a separate estimate (local estimate). It is worth noting that most prices for the installation of electrical appliances from Part 8 “Electrical installation work in electrical installations”, incl. switchboards, control cabinets, circuit breakers, relays, disconnectors, transformers, capacitors, etc., include grounding and connection to grounding buses in the list of work performed. Thus, grounding work needs to be assessed only if there are specific volumes in the work sheet, for example:

Installation of vertical grounding – 20 m;

Installation of horizontal grounding conductor – 100 m;

Laying of wire PV3 of various sections, yellow-green;

Installation of a round steel grounding conductor.

Let's consider the list of works and material resources that are included in the prices for grounding:

Cost of FERM (TERM, GESNm) 08-02-471 for installation of vertical grounding conductors made of angular and round steel in example estimates

. This standard provides not only for installation, but also for the production of grounding conductors, thus, the costs of cutting steel structures to specified dimensions do not need to be taken into account additionally. Digging a hole along the ground electrode, on the contrary, needs to be priced additionally, since the price takes into account only its deepening and welding.

Price FERM (TERM, GESNm) 08-02-472-01 (-02, -03, -04, -05) for the installation of a horizontal ground electrode in the example estimates

similar to vertical;

In the price of FERm (TERm, GESNm) 08-02-472-06 (-07, -08, -09) for installation of a grounding conductor on building foundations

not only the conductor itself is manufactured, but also the fastening parts to it, as well as protective boxes;

The price of FERM (TERM, GESNm) 08-02-472-10 for laying a conductor up to 25 mm2 does not provide for the manufacture, but for the installation of fastening parts (dowels and screws with a drill), the layout of wires and connections. Some estimators use this rate to estimate the laying of PV3 wires of various sections (yellow-green).

The estimator has to inspect the lightning protection device much less frequently than the grounding. In the example of the estimate calculation, which is offered for your consideration, the lightning protection device is carried out in the form of installing steel structures of lightning rods on a reinforced concrete foundation and pulling conductors to the supports.

APPLICATION OF PRICES IN ESTIMATES

Let's look at examples of using prices from collections.

Example 1. Installation of the ground loop of a KTP

According to the project documentation, we apply the following prices:

Example No. 2. Installation of lightning protection and grounding.

According to the specification, we apply the following prices:

Here we have looked at only some examples of the application of prices for grounding.

As we can see from the examples of estimates, if the project specifies grounding data, there is nothing complicated in applying the prices. If there is no project, then it is necessary to use the PUE, grounding of electrical installations.

If it is necessary to carry out dismantling work on grounding, we apply the same prices, but with dismantling coefficients. In fact, the ground loop in the ground is usually not dismantled.

It is also important to take into account that all prices are comprehensive, they provide for a range of work; it is very important to study the technical part of the collections and the composition of the work of the applicable prices.

Source

Prices for lightning rods in the estimate

Prices in estimates for lightning protection most often depend on the type of structure used. However, they almost always include an element such as a lightning rod. The main collection containing standards for the installation of lightning rods is the collection FER33.

In this collection there are several standards that can be included in the sample estimate for grounding and lightning protection. One of these standards is the standards FER33-02-007-21 and FER33-02-007-22. They take into account the installation of free-standing lightning rods of different heights. The scope of work in the norms is quite complex and includes the installation of crushed stone cushions, installation of structures and their fastening, as well as backfilling of the excavation pits and welding of seams.

In addition, the estimate for lightning protection may include one of the standards in table FER33-02-013. This table contains prices for the installation of welded and bolted lightning rods, as well as free-standing lightning rods with a spire.

Grounding

Grounding – designed to protect a person from electric shock and connects a device, equipment, structure, etc. to a grounding device. In turn, a grounding device is a system of grounding conductors and ground electrodes connecting the ground to electrical installations, devices, and structures.

When constructing any objects, it is necessary to carry out grounding; let’s look at the prices in the construction and installation collections of estimate programs.

In order to ground devices, electrical installations, structures, etc., we need to make a grounding device: it consists of a grounding loop and grounding conductors.

The grounding loop is made in the ground - for this we need to prepare a trench for the loop and accordingly we apply the prices from the first collection for earthworks; a standard trench for laying a grounding loop has dimensions of 200 mm x 700 mm. Depending on the volume and grounding plan of the adjacent territory, the development of the trench is carried out with an excavator (bar) or manually, install vertical grounding conductors and horizontal ones, most often for vertical grounding conductors, angle steel from various manufacturers is used with dimensions of 50x50 mm and 63x63 mm, round steel with a diameter of 12 mm to 20 mm, for a horizontal grounding conductor (grounding bus) a strip of 4x40 mm, 5x40 mm, 4x25 mm is used.

According to the PUE, the depth of the horizontal grounding conductor (grounding bus) is 0.5-0.7 meters and at a distance of 0.8-1 meter from the foundation or base of the equipment. Vertical grounding conductors should be 3-5 meters long.

Also, structures, equipment, machinery, etc. are grounded inside premises, buildings, production workshops, etc. of buildings and structures. The grounding conductor is laid along the structures. For this, a strip of 4x40 mm, 5x40 mm, 4x25 mm, copper wire of various sections, or the 5th core of the cable is used. Wire grounding is used for grounding structures and equipment. All data must be recorded in the design documentation, defective statement or statement of quantities.

Here we see prices depending on the grounding installation:

– vertical grounding; – horizontal grounding; – grounding of structures.

Lightning protection of buildings plus lightning protection rods or racks according to GESN 33 is also calculated at the same prices.

Depending on the type of work and the method of grounding, there are prices in the construction book; to do this, just type in the search engine the keyword “grounded...” and the program gives us the following prices:

As you can see in the table. 2 grounding is used not only in power supply, but also in grounding building structures. Depending on the work performed, we use prices from the relevant collections.

Let's consider the prices for grounding according to the 8th collection of electrical installation works:

How to make grounding. Video

The answer to the question of how to properly ground a house can be obtained by watching this video.

To ensure normal and comfortable life, effective grounding and lightning protection systems are necessary. A reliable system can be built on your own if you have sufficient information about current, lightning action and lightning protection, as well as all regulations. Therefore, to make design decisions, it is easier to seek the help of professionals who will provide all the necessary information for the further construction of lightning protection. High-quality documentation, an estimate, and a work acceptance certificate are the necessary data for organizing the construction of lightning protection with your own hands.