Plagued by high voltages and power spikes? With a Netshield power solution you can protect your buildings on all levels including distribution boxes and server cabinets.

For Buildings/Businesses with Server rooms

It is an unfortunate fact of life that computers, computer related products, process control and data communications equipment can be damaged by high-voltage surges and spikes. Such power surges and spikes are most often caused by lightning strikes but can also be caused by power cuts, for example load shedding. A lot can be done as far as protection is concerned. However, it is best to begin by describing the magnitude of the threat from which you need protection. The first stroke of lightning during a thunderstorm can produce peak currents ranging from 1,000 to 100,000 Amperes with rise times of 1 microsecond. It is hard to conceive of, let alone protect against, such enormous magnitudes. Fortunately, such threats only apply to direct hits on overhead lines. Hopefully, this is a rare phenomenon. More common is the induced surge on a buried cable. When lightning hits the ground, it creates a ripple effect such as when a drop falls into water. These ripples can travel up to 5km through buried cable and can damage unprotected equipment. Another cause of damage to equipment comes from power cuts or power surges. This can be described by viewing electricity like a river, flowing into different channels. When a channel is closed, the water must still go somewhere causing some of the other channels to reach peak levels. Computer equipment has often been damaged by lightning, not because of the absence of a protection device, but because inadequate attention was paid to grounding. Good quality ground connection cannot be emphasized enough. Conceptually, lightning protection devices are switched to ground. Once a threatening surge is detected, a lightning protection device grounds the incoming signal connection point of the equipment being protected. Thus, redirecting the threatening surge on a path-of-least-resistance (impedance) to ground where it is absorbed. When providing surge protection for a building, there are three components that need protection:

  1. The Street Power Distribution Box from Eskom will take the highest spike and therefore one must install the flash/trap. This installation must be executed by a qualified electrician.
  2. Some buildings have only one Distribution Box where others have one on each floor depending on the size of the building. In each and every one of these DB Boxes it is necessary to install an NLFC1S350/NLFC3S350, depending on whether 1-phase or 3-phase power is used. In case of a strike the trip switch will trip and will not be able to be reset again before the blown fuse, indicated by a red LED light, is replaced with a (NLRF350ST/NLRFN350ST). This ensures that no strike will go unnoticed and that the equipment might be left unprotected for only a short period of time, until the fuse in question has been replaced.

In the server room it is necessary to install a unit from either the NLMAIN-range or the NLPROCHS-range, depending on the need of the user: The differences are as follows:

  • Between an NLMAIN-range and NLPROCHS-range:

The NLMAIN-range (NLMAINUNIT-2U-E & NLMAINLITE-2U-E) offers protection to X21 Telkom lines as well as has an internal SNMP device that enables the user to connect to monitoring software. There are two more slots available to either expand to X21/V11, Ethernet or E1. If further expansion is needed the NLSP-M20-X21 chassis (use with NLPROV11R2, NLPROETH, NLPROE1) or NLSP-M20 chassis (use with NLPROETH, NLPROE1) can be added to accommodate further protection for X21/V11, Ethernet and E1. The NLPROCHS-range (NLPROCHS-2U-E & NLPROCLITE-2U-E) does not have these additional features although it can be upgraded with the chassis to protect X21/V11, Ethernet or E1 lines.  It has an internal SNMP device that enables the user to connect to monitoring software.

  • Between an NLxxxx-2U, NLxxxx-2U-E and NLxxxxLITE-2U-E:

The NLxxxx-2U is an old version offering X21/V11 protection, but does not offer the option of monitoring and is currently being phased out. The NLxxxx-2U-E and NLxxxxLITE-2U-E come standard with an SNMP device enabling the user to connect to monitoring software, as well as offering X21/V11 protection.

  • Between an NLxxxx-2U-E and NLxxxxLITE-2U-E:

The NLxxxxUNIT-2U-E has 1 low-power meter probe containing 16x kettle (IEC) connectors giving out 16A max, and 2 high-power meter probes containing 4x 20A (IEC) connectors each, giving out 32A max. These devices are suitable for larger environments. The NLxxxxLITE-2U-E has a Power Distribution Unit (PDU) containing 8x kettle (IEC) Connectors. It gives out 16A max and is suitable for smaller environments. SMALL OFFICE/HOME OFFICE APPLICATIONS Protect your business and your home from unnatural power surges that manifest through your power or Telkom lines with a small business solution from Netshield. For Field Offices/SOHO Environment The NLSP-range of surge protection consists of standalone units available to protect general equipment and Telkom lines. It comes standard with one plug point where the user can add a short extension lead with additional plug points if more than one device needs protection as long as it does not exceed 16A. It has the additional feature that it contains technology determining the functionality of components and detecting when damage occurs. It can then visually indicate, through an LED light, whether it is still functional or not.  This gives the user the advantage of monitoring the surge protection, knowing when the unit took a fatal strike and needs to be replaced. The range consists of:

  • NLSP-M-M: To protect equipment such as a PC, Hi-Fi or TV
  • NLSP-ADSL-M: To protect internet access and Telephone lines
  • NLSP-E1-M: To protect all G703 lines and PABXs
  • NLSP-ETH-M: To protect all Network applications including 10/100/1000 and PoE protection in one unit.

Krone Surge protection The Krone (NQ-KP range) is used in the Telkom Sub Distribution Box where a direct cable containing several strands of copper needs to be individually divided and allocated in a terminal block. The range gives the option of either protecting 1 allocated strand or up to 10 allocated strands.

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Distribution Boxes

NLCNUBE N Type Connector Plug to Socket 180VDC,130VAC NLCOAXPS N Type connector Plug to Socket 70vdc,50VAC NLCUBE BNC Type Connector Plug to Socket 180VDC,130VAC NLFC1S350 Single phase TYPE I and II Protection with management NLFC3S350 Three phase TYPE I and II Protection with management NLRF350ST Replacement Thermal Spark gap unit NLRFN350ST Replacement thermal spark gap and MOV unit NLRV350ST Replacement Thermal Spark gap unit NLRVN350ST Replacement Thermal Spark gap and MOV unit NLVC1S350 Single Phase compact TYPE II Surge protection with management NLVC3S350 Three Phase compact TYPE II surge protection with management


NMFD-xxxx-x Krone Compatible MFD Surge Protectors

Server room Cabinets

NLMAINLITE-2U-E – X21,V11 Surge protection for small environments NLMAINUNIT-2U-E – X21,V11 Surge protection for larger environments NLMNDBLT1P-3U15A – Surge protection for server cabinets with Access control and enviromental management NLMNDBNT1P-3U32A – Surge protection for server cabinets with Access control and environmental management NLPROCHS-2U-E – Surge protection for larger environments excluding X21,V11 protection NLPROCLITE-2U-E – Surge protection for small environments excluding X21,V11 protection

Small Office/Home Office

NLPROE1 Dual E1 Interface Used in 2U Surge protection chassis NLPROETH 10.100.1000 Ethernet Surge Protection gor 3U chassis NLSP-E1-M Protection for E1 in most telephone exchanges NLSP-M20 3U chassis with 20 slots NLSP-M20-X21 3U chassis with 20 slots NLSP-xxx-x Lightning and Surge Protection range (ADSL,E1, ETH and power)