Nokia BTS Installation Standard 2

GROUNDING PRINCIPLE

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SITE ENGINEERING STANDARDS/ANIL KOUL

Company Confidential

INDOOR GROUNDING CABLINGIndoor Cable Tray

UltraSite grounding cable size is 25mm2. DDF grounding cable size is 16mm2. EMP busbar grounding cable size is 25mm2. Right cable lugs have to be suitable for grounding cable. All cables have to be labeled on both end of the cable. Proper tools have to be used during grounding cable installation. All cables have to be fixed properly.

DDF

Label

MAIN GROUNDING BUSBAR

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INDOOR GROUNDING CABLING Example of good installation of grounding busbar

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USE OF PROPER TOOLS Proper tools has to be always used. If crimping fails, cable lug has to be changed and new crimping applied. Lugs should match the cable size. Hex crimp have to be used.

Not OK : Crimping not acceptable

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MAKE ACCEPTABLE CONNECTION Proper tools has to be always used. Lugs should match the cable size. Strip cable correctly. Hex crimp have to be used. Connection have to be protected by heat shrink or plastic sleeve. Do not use electrical tape.

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MAKE ACCEPTABLE CONNECTION Cable lug correctly hex crimped.. Connection have to be protected by heat shrink. Do not use electrical tape.

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MAKE ACCEPTABLE CONNECTION

Correct plastic sleeve on crimp joint Correct heat shrink on crimp joint

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FEEDER GROUNDING CABLINGFEEDER GROUNDING KIT POSITIONS

External Jumper 1

Antenna

Grounding Points

Equipment Room 3 Internal Jumper 2

If vertical rise of the RF cable is > 40m then center earth kit is required to be installed

Feeder Cable BTS Cable Entry Gland Plate

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FEEDER GROUNDING CABLING Feeders have to be grounded before feeder entry of cabin / equipment room. All feeder grounding kits have to be connected to feeder entry grounding busbar . Feeder grounding kit manufacturer material have to be used. All cables have to be labeled on both end of the cable. Proper tools have to be used during grounding cable installation. All cables have to be fixed properly.

Shelter/ Room Outdoor Cable tray

Feeder Grounding Kit

FEEDER ENTRY GROUNDING BUSBAR

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FEEDER GROUNDING CABLINGAntenna Jumper Cables

Feeders have to be grounded after antenna jumper connection. All feeder grounding kits have to be connected to feeder grounding busbar .Feeder label

Feeder grounding kit manufacturer material have to be used.Feeder Grounding Kit

All cables have to be labeled on both end of the cable. Proper tools have to be used during grounding cable installation. All cables have to be fixed properly.

FEEDER GROUNDING BUSBAR

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FEEDER GROUNDING CABLING Feeders have to be grounded approx. 5001000mm before horizontal bending. All feeder grounding kits have to be connected to feeder grounding busbar . Feeder grounding kit manufacturer material have to be used.Feeder Grounding Kit

Used cable lugs have to be suitable for used grounding cable. All cables have to be labeled on both end of the cable.

FEEDER GROUNDING BUSBAR

Proper tools have to be used during grounding cable installation. All cables have to be fixed properly.

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GROUNDING CABLINGC-CRIMP INSTALLATIONWrap joint with rubber tape or use heat shrink Main Cable

Copper C Crimp

Joining Cable

NOTE: The copper C crimp must be the correct size for the cables e.g.. 25/16, 25/25, etc and the crimp tool must have the correct size C CRIMP dyes installed or selected.32 NOKIA SITE ENGINEERING STANDARDS/ANIL KOUL


FEEDER GROUNDING CABLING The grounding kit must always be positioned on the straight part of feeder cable and never on a bend or curve in the cable. Grounding kit's earthing cable can be cut or extended to make grounding cable connection to busbar as straight as possible.

Good installation

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COMMON MACRO :ANTENNA LINE SYSTEM ItemDescription

1 2 3 4 5 6 7 8

The antennas can be either vertically polarised or cross polarised and directional or omni-directional antenna. The jumper cable is a flexible low loss cable (1/2"), which is used at the ends of the feeder. It protects the connectors from the forces caused by the feeder cable. 7/16 connector are made of silver plated brass or a special grade of copper. All connectors are IP68-classified. The grounding kit ensures that the Antenna line is DC grounded as a protection against lightning. The RF-feeder is corrugated coaxial cable. It can be of different sizes, i.e. 1/2, 7/8 and 1 5/8, depending on the length of the mast and the desired attenuation. Cable clamps are made of stainless steel and plastic and they are easy and quick to install. Design of the clamps prevents over tightening of a feeder cable. A compact EMP protector protects the BTS against lightning and over voltage that may occur down the antenna line. The wall feed through kit facilitates the connection of the feeders to the inside of a building without the ingress of water.Outdoor Indoor

1

2

3 4 5 6

4

8

3

2

7

Fig 1. Antenna Line System without MHA34 NOKIA SITE ENGINEERING STANDARDS/ANIL KOUL


FEEDER CABLING SUPPORT

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FEEDER CABLING SUPPORT

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GROUNDING KIT INSTALLATION

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JUMPER CABLES INSTALLATIONOK Not OK Jumper Cables have to be installaed as straight as possible. Avoid additional bendings. Follow manufacturers bending instructions. Proper tools have to be used during jumper installation. All cables have to be fixed properly. Prefabricated jumpers have to be used always when possible. On existing sites most practical solution should be used. Think about future.

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JUMPER CABLES INSTALLATION Jumpers Cables have to be installaed as straight as possible. Avoid additional bendings. Follow manufacturers bending instructions. Proper tools have to be used during jumper installation. All cables have to be fixed properly. Prefabricated jumpers have to be used always when possible. On existing sites most practical solution should be used. Think about future.

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JUMPER CABLES INSTALLATION The distance clamps for jumper cables is about 500mm It is vitally important that the internal and external jumper cables have to be supported securely. For the 1,5m jumper, minimum 2(two) points of support are to be used, and for the 3m jumpers, minimum 4(four) points.

1.5m jumper, used 2 securing point

Securing has to be near of the connection < 150mm40 NOKIA SITE ENGINEERING STANDARDS/ANIL KOUL


Nokia BTS Installation Standard 2

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