Surge protection of single-family houses

It's not a secret that a properly executed external lightning protection system is able to protect your home from physical destruction in the result of a lightning strike. But it is not able to protect all devices and appliances at home from damage due to exposure to pulse lightning surges. Special devices - SPDs (the so-called internal lightning protection) are used for this purpose. Properly chosen and installed SPDs are able to take the dangerous overvoltage away, thereby preventing their impact on your equipment.

First of all, we will hold an analysis of all the possible ways of penetration of surge to your devices.

In a general case, the following ones can be highlighted:

  • low-voltage power supply network (220/380 V) - in the result of flowing of lightning current over the elements of external lightning protection (and further over the ground electrode);
  • low-voltage power supply network (220/380 V) -in the result of a lightning strike into an air line (overvoltage occurring at the switching of high-voltage equipment at the substation can be related here);
  • TV signal transmission network;
  • data network (Internet);
  • other low-voltage networks, providing home services (video surveillance, burglar and fire alarms, etc.).

Surge protection of single-family houses

Surge protection device

 

Low-voltage power supply network protection*

1. The house is equipped with external lightning protection

In this case, the maximum possible impact should be considered - lightning strike into the external lightning protection system itself. Rated lightning current through the SPD - 100 kA (pulse form 10/350 ms).

The house is equipped with external lightning protection

o protect against this type of threat, you need to place the device in the entrance electrical panel (on the side of the building), that can stand and take such a powerful pulse away. We offer a unique solution - combined SPD of Class 1+2+3**. One such device is sufficient to protect all electrical equipment in the house***.

Depending on how you perform grounding of the protective conductor (TN-C-S or TT scheme), you can select one of the devices suitable for you:

 

2. The house is powered by an overhead line ( there is no external lightning protection system)

Maximum possible impact - lightning strike into the overhead power line. Rated lightning current through the SPD - 100 kA (pulse form 10/350 ms).

The house is powered by an overhead line ( there is no external lightning protection system)

To protect electricaol equipment against this type of threat, you need to place the device in the entrance electrical panel (on the side of the building), that can stand and take such a powerful pulse away.

If SPD is installed into a switchboard on the wall of a building, the protection circuit is similar to case 1.

If the arrester is installed into a shield on the post, it is not reasonable to use SPD of class 1+2+3, because there can be repeated (induced) strains in the cable on the way from installation site to the protected house. We offer to use SPD of class 1+2**. If the distance from the place of installation of the SPD 1+ 2 to the house is greater than 60 m, an additional SPD of Class 2***.

Depending on how you performed grounding of the protective conductor (TN-C-S or TT scheme), you can select one of the protective schemes suitable for you:

Installation site TN-C-S scheme TT scheme
1. on branch (on the post) PowerPro BC TNS 25/100
PowerPro BC TNS 25/100
LE-373-950
PowerPro BC TT 25/100
PowerPro BC TT 25/100
LE-373-920
2. at the enterance of the building (if the distance from the installation site of the SPD 1+2 is greater than 60 m) EnerPro C TNS 275
EnerPro C TNS 275
LE-381-178
EnerPro C TT 275
EnerPro C TT 275
LE-381-180

3. The house is powered by an underground cable (no external lightning protection system)

The maximum possible impact - induced surge voltages, getting of a partial lightning current into the network is excluded****. Rated surge current through the SPD - up to 40 kA (pulse form 8/20 ms).

The house is powered by an underground cable (no external lightning protection system)

To protect the electrical equipment from this type of threat, you need to place a device on the entrance electrical panel (on the side of the building), that can sustain and take this pulse away - SPD of class 2***.

Depending on how you perform grounding of the protective conductor (TN-C-S or TT scheme), you can select one of the devices suitable for you:

TN-C-S scheme TT scheme
EnerPro C TNS 275
EnerPro C TNS 275
LE-381-178
EnerPro C TT 275
EnerPro C TT 275
LE-381-180

Notes

* In all the studied cases it is assumed that a three-phase input is made in the house, rated voltage of 220 V.

** Read more information about SPD classification at the link..

***If you have particularly sensitive equipment, it is possible to install additional SPDs of class 3 into the nearest local switchboards or to use SPDs of class 3, built into a power outlet.

**** A situation when the entry to the building is carried out by an underground cable, but the distribution of electricity from TP is carried over overhead lines is not referred to this case. This situation is equivalent to the one, studied in p.2..

Advantages of the offered SPDs

Combined SPDs of class 1+2+3 provide protection both against lightning current and induced surges.

  • Quick and easy installation, modular design;
  • lightning current limit up to 100 kA (10/350 ms);
  • very low limit voltage from 0.75 kW to 1.0 kW (is suitable for protecting even the most sensitive equipment);
  • no leakage currents - can be installed in front of the meter;
  • maximum reliability;
  • parameters independent from pressure and humidity;
  • no blow hole - it is not required to maintain the permissible distance to other devices;
  • great overvoltage withstand.

SPDs to be used in power supply network

Surge protective device of class 1+2+3 PowerPro BCD TNS 25/100 Surge protective device of class 1+2+3 PowerPro BCD TNS 25/100

A unique combined SPD with a very low limit voltage is intended for the use in three-phase networks with neutral mode TN-S (TN-C-S) with the voltage of 220/380 V, 50 Hz.

  LE-373-960
Maximum lightning impulse current (10/350 ms): 100 кА
Limiting voltage Up
(not more):
1,0 kV
Maximum working voltage: 255 V
 

Surge protective device of class 1+2+3 PowerPro BCD TT 25/100 Surge protective device of class 1+2+3 PowerPro BCD TT 25/100

The unique combined SPD with the very low limit voltage, is intended for use in three-phase networks with neutral mode TT voltage 220/380 V, 50 Hz.

  LE-373-930
Maximum lightning impulse current (10/350 ms): 100 kA
Limiting voltage Up
(not more):
1,0 kV
Maximum working voltage: 255 V
 

Surge protective device of class 1+2 PowerPro BC TNS 25/100 Surge protective device of class 1+2 PowerPro BC TNS 25/100

Combined SPD for use in three-phase networks with neutral mode TN-S (TN-CS) voltage of 220/380 V, 50 Hz.

 

  LE-373-950
Maximum lightning impulse current (10/350 ms): 100 kA
Limiting voltage Up
(not more):
2,5 kV
Maximum working voltage: 255 V
 

Surge protective device of class 1+2 PowerPro BC TT 25/100 Surge protective device of class 1+2 PowerPro BC TT 25/100

Combined SPD for use in three-phase networks with neutral mode TT voltage of 220/380 V, 50 Hz

 

  LE-373-920
Maximum lightning impulse current (10/350 ms): 100 kA
Limiting voltage Up
(not more):
2,5 kV
Maximum working voltage: 255 V
 

Surge arresters of class 2 EnerPro C TNS 275 Surge arresters of class 2 EnerPro C TNS 275

SPD for use in three-phase networks with neutral mode TN-S (TN-C-S) voltage of 220/380 V, 50 Hz.

 

  LE-381-178
Rated surge current (8/20 ms): 15 kA
Maximum surge current (8/20 ms): 40 kA
Limiting voltage Up
(not more):
1,4 kV
Maximum working voltage: 275 V
 

Surge arresters of class 2 EnerPro C TNS 275 Surge arresters of class 2 EnerPro C TT 275

Combined SPDs for use in three-phase networks with neutral mode TT voltage of 220/380 V, 50 Hz.

 

  LE-381-180
>Rated surge current (8/20 ms): 15 kA
Maximum surge current (8/20 ms): 40 kA
Limiting voltage Up
(not more):
1,4 kV
Maximum working voltage: 275 V
 

Purchase

You can see the current prices and acquire necessary devices for surge protection in a convenient online store on a separate page "Purchase".

 

Protection of television and computer equipment

 

1. Analog, digital and / or satellite TV

If there is a lightning rod on the roof of your house (especially if its functions are performed by a mast on which there is a TV antenna), it should be taken into account that the partial lightning current can flow in the TV signal transmission network. In this case, the equipment (e.g., TV) may be damaged even if it is protected from the power supply side. Moreover, this situation could cause fire or even explosion of the equipment, which results in much greater losses and the health risk of residents.

To eliminate these risks, it is necessary to install a special protective device into the TV signal transmission circuit. You can select one of the two devices, depending on the type of the signal:

Analog TV Digital / satellite TV
DataPro Radio/TV
DataPro Radio/TV
LE-210-030
DataPro SAT
DataPro SAT
LE-210-020

2. Data transmission networks (Internet)

The Internet is extremely sensitive to various disturbances and overvoltages. The smallest similar exposure can lead to data loss and even damage of the equipment. To protect yourself from these troubles, we recommend to install a specialized SPD into the network.

Internet networks
DataPro RJ45 PoE Alu
DataPro RJ45 PoE Alu
LE-240-021

3. Other systems (video surveillance, burglar and / or fire alarm system, 
"smart home")

Low-voltage management, data transmission and control networks are widely used in the listed systems. These networks are very sensitive to even small in value and duration overvoltages. Besides, protective devices used in them should not modify the quality and reliability of the whole system operation (should not distort the signal). That is why, their protection should be treated with special care.

Our technical center is always ready to help you with this and offer a customized solution of the task.

SPDs for protection of TV and computer equipment

DataPro SAT / Radio/TV DataPro SAT / Radio/TV

SPDs for protection of TV receivers (including satellite) and radio.

  • High efficiency;
  • It is made on the base of a gas-filled surge arrester;
    • nominal current discharge is 2.5 kA (10/350 ms);
  • simple to install;
  • test standard: IEC 61643-21 / EN 61643-21;
  • Category IEC / EN: C1/C2/C3/D1.
Type
Frequency (MHz)
Product item
DataPro-SAT 0 – 2150 LE-210-020
DataPro-Radio/TV 0 – 862 LE-210-030
 

DataPro RJ45 PoE Alu-2 DataPro RJ45 PoE Alu

SPD for use in LAN data network (Cat 5e) at a transfer rate up to 1 Gbit /s. It is intended to protect devices in PoE system.

  • RJ45 connector on both sides of the device;
  • is suitable for both shielded and unshielded cables;
  • the unit is equipped with a connecting cable;
  • is compatible with 10Base-T /100BASE-T/100BASE T;
  • test standard: IEC 61643-21 / EN 61643-21;
  • category IEC/EN: C1/C2/C3.

 

Type
Product item
DataPro RJ45 PoE Alu LE-240-021
 

You can see a full range of SPDs on the relevant pages of our website.

Purchase

You can see the current prices and acquire necessary devices for surge protection in a convenient online store on a separate page "Purchase".