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7 Preparing for Auxiliary Facilities of theBTS3812E Site

About This Chapter

Auxiliary facilities of the BTS3812E site consist of cable racks, cable troughs, grounding bars,

and transmission devices. The auxiliary facilities must be prepared before you install the

BTS3812E.

7.1 Installing the Cable Racks

The cable racks are used to facilitate the routing of the cables Cable ladders and cable troughs

compose the cable rack. The cable trough is installed on the cable ladder. The installation of thecable trough is optional.

7.2 Installing the NodeB Grounding Bar

The grounding bar is used to connect PGND cables of the cabinet.

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7.1 Installing the Cable Racks

The cable racks are used to facilitate the routing of the cables Cable ladders and cable troughscompose the cable rack. The cable trough is installed on the cable ladder. The installation of the

cable trough is optional.

Context

The cable rack mainly consists of cable ladders, and sometimes also consists of cable troughs.

That is, the cable troughs are optional.

The mapping between the cable ladder and the cable trough is as follows:

l The 200 mm wide cable ladder matches the 200 mm wide cable trough.

l The 400 mm wide cable ladder matches the 400 mm wide cable trough.

l The 400 mm wide cable trough and the 200 mm wide cable trough are jointed to match the

600 mm wide cable ladder.

The cable ladder delivered is 2.5 m long and the cable trough is 2 m long.

7.1.1 Introduction to Cable Racks

For overhead cabling, a cable rack is required for cable installation in the equipment room. A

cable rack consists of a cable ladder and a cable trough(s). Cable troughs, however, are optional.

7.1.2 Procedure for Installing the Cable Racks

The procedur e for installing the cable racks include: installing the indoor cable rack, installing

the outdoor cable rack, connecting the cable ladders, installing the cable trough, and installing

the accessories of the cable rack.

7.1.3 Installing the Indoor Cable Rack

An indoor ca ble rack can be installed on the ceiling, on the floor, against the wall, or on the top

of the cabinet.

7.1.4 Installing the Outdoor Cable Rack

An outdoor cable rack can be installed on the floor or on the wall.

7.1.5 Connecting Cable Ladders

In actual installations, you may need to dock two cable ladders, to connect the cable ladders or

cable troughs in a T shape, to connect the cable ladder to the wall, or to lay the cable ladder

upwards or downwards. For details on how to connect the cable ladders, refer to the

corresponding topic.

7.1.6 Installing the Cable Trough

This topic describes how to connect and install the cable troughs.

7.1.7 Installing Accessories

During the installation of the cable rack, the required accessories are the cable manager, end

cover, bushing, and baffle ring.

7.1.1 Introduction to Cable Racks

For overhead cabling, a cable rack is required for cable installation in the equipment room. A

cable rack consists of a cable ladder and a cable trough(s). Cable troughs, however, are optional.

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Specifications

Select the cabling troughs by observing the following rules:

l For a 200-mm wide cabling ladder, use a 200-mm wide cabling trough.

l For a 400-mm wide cabling ladder, use a 400-mm wide cabling trough.

l For a 600-mm wide cable ladder, use a 400-mm wide cable trough and a 200-mm wide

cable trough.

The cable ladder is 2,500 mm long and the cable trough is 2,000 mm long.

Items

Table 7-1 shows the items required for mounting a cable rack.

Table 7-1 Items required for mounting a cable rack

Figure 7-1 Cable ladder Figure 7-2 U-shape connecting piece

Figure 7-3 Bracket angle Figure 7-4 Cable manager

Figure 7-5 Triangular support Figure 7-6 Connecting clip




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Figure 7-7 Fixing clip Figure 7-8 Cable trough

Figure 7-9 Bushing Figure 7-10 End cover

Figure 7-11 Rectangular frame Figure 7-12 U-steel

Figure 7-13 Over-cabinet support

7.1.2 Procedure for Installing the Cable Racks

The procedure for installing the cable racks include: installing the indoor cable rack, installing

the outdoor cable rack, connecting the cable ladders, installing the cable trough, and installing

the accessories of the cable rack.

Procedure

Step 1 Perform 7.1.3 Installing the Indoor Cable Rack .




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Step 2 Perform 7.1.4 Installing the Outdoor Cable Rack .

Step 3 Perform 7.1.5 Connecting Cable Ladders.

Step 4 Perform 7.1.6 Installing the Cable Trough.

Step 5 Perform 7.1.7 Installing Accessories.

----End

7.1.3 Installing the Indoor Cable Rack

An indoor cable rack can be installed on the ceiling, on the floor, against the wall, or on the top

of the cabinet.

Context

CAUTION

When you install a cable rack, ensure that the cable rack is insulated from the floor, ceiling, and

wall.

7.1.3.1 Installing the Indoor Cable Rack on the Ceiling or on the Floor

When the cabling rack cannot be mounted on the wall, you can install the cable rack on the

ceiling or on the floor.

7.1.3.2 Installing the Indoor Cable Rack on the Wall

This topic describes how to install the cable rack when the cable rack is against the wall.

7.1.3.3 Installing the Indoor Cable Rack over the Cabinet

When the cables are routed over the cabinet, the cable rack can be installed on the top of the

cabinet. The cable trough, however, is excluded to facilitate heat dissipation.

Installing the Indoor Cable Rack on the Ceiling or on the Floor

When the cabling rack cannot be mounted on the wall, you can install the cable rack on the

ceiling or on the floor.

Context

l When you install the cable rack on the ceiling, connect the suspending levers to the ceiling.

l When you install the cable rack on the floor, connect the supporting levers to the floor.

You can follow the same method for installing a cable rack on the ceiling as that for installing

a cable rack on the floor The following part illustrates how to install a cable rack on the ceiling.




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CAUTION

l The spacing between two suspending levers or two supporting levers must be an integer

multiple of 50 mm. When the recommended 1,250-mm spacing is used, each segment of thecable ladder is supported by two suspending levers.

l For facilitating the installation of the cable trough, the suspending levers and supporting

levers must be mounted on the outer side of the cable ladder. In addition, insulating pads and

insulating washers must be used to insulate the cable rack from the ceiling or the floor.

l When you fix the bracket angle to the ceiling or to the floor by using expansion bolts, replace

the flat washers with large flat washers 8.

Procedure

Step 1 Based on the engineering design, determine the location of the cable rack.

Step 2 Based on the location of the cable rack, determine and mark the positions for installing thesuspending levers.

Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between60 mm and 65 mm.

Step 4 Use a screwdriver to fasten the nut in the counterclockwise direction to the top of the M8 x 80expansion bolt, and feed the bolt vertically into the hole. Hammer the expansion bolt until the

tube is completely buried in the ceiling. Remove the flat washer, spring washer, and nut from

the expansion bolt.

Step 5 Based on the height of the cable rack and the equipment room, cut an appropriate length of the

U-steel that is used as a suspending lever. If the required length exceeds 2,500 mm, you can jointwo U-steels together. For details on how to join two U-steels, refer to 7.1.5.1 Dock ing Cable

Ladders. Be sure to apply paint to the surface of the cut section.

Step 6 Use a M6 x 20 bolt and a M6 nut to mount the bracket angles onto both ends of the suspendinglever.

Step 7 Apply insulating pads to the expansion bolts, and then lead the expansion bolts through the holeson the bracket angle. Place the insulating washers, large flat washers 8, spring washers 8, and

M8 nuts sequentially onto the expansion bolts, and then fasten the M8 nuts to fix the suspending

lever.

Step 8 Use a bolt M8 x 20 and a nut M8 to connect the cable ladder to the suspending lever. Figure7-14 shows the cable rack installed on the ceiling.




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Figure 7-14 Cable rack installed on the ceiling

CAUTION

Use a bolt M6 x 20 to connect the bracket angle and the suspending lever. If the cable ladder is

equipped with a cable trough, the bolt M6 x 20 must be as close to the top end as possible, and

the spacing between the bolt and the cable ladder must be greater than 40 mm, as shown in

Figure 7-14.

Step 9 If there is an obstacle on the ceiling or the required support span is wide, you can use the U-steelto connect the two suspending levers and fix the U-steel perpendicular to the cable ladder, as

shown in Figure 7-15.




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Figure 7-15 Cable rack installed on the ceiling with an obstacle

----End

Installing the Indoor Cable Rack on the Wall

This topic describes how to install the cable rack when the cable rack is against the wall.

ContextNOTE

When you use a triangular support for installing the cable rack, abide by the following rules:

l When you fix the triangular support to the wall, ensure that you insulate the support from the wall

by using insulating pads and insulating washers.

l When you use expansion bolts to fix the triangular support to the wall, ensure that you replace the

flat washers of the expansion bolts with large flat washers 8.

l The spacing between two adjacent triangular supports must be an integer multiple of 50 mm.

Otherwise, the triangular supports cannot hold the cable ladder stably. The recommended spacing is

1,250 mm, that is, each segment of the cable ladder is supported by two triangular supports.

l Two insulating pads must be installed between the wall and an upright beam of the triangular support.An insulating washer must be installed between the nut and the upright beam.

Procedure


Step 2 Determine the location of the triangular support and accordingly mark the positions of the drillingholes. Ensure that each segment of the cable ladder is supported by two triangular supports and

that the spacing between two adjacent triangular supports is 1,250 mm.

Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between

60 mm and 65 mm.




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Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80expansion bolts, and feed the bolts vertically into the holes. Hammer the expansion bolts until

the tubes are completely buried in the wall.

Step 5 Remove the flat washers, spring washers, and nuts from the expansion bolts, and lead the

expansion bolts through the insulating pads.

Step 6 Lead the expansion bolts through the holes on the triangular support. Install in sequence theinsulating washers, large flat washers 8, spring washers 8, and nuts M8. Fasten the nuts to fix

the triangular support to the wall, as shown in Figure 7-16.

Figure 7-16 Fixing the triangular support

Step 7 Place the cable ladder on the horizontal beam of the triangular support, align the holes on thelower side of the U-steel with the holes in the horizontal beam of the triangular support, and

connect the cable ladder and the triangular support by using bolts M6 x 20 and nuts M6, as shown

in Figure 7-17.




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Figure 7-17 Fixing the cable ladder

----End

Installing the Indoor Cable Rack over the Cabinet

When the cables are routed over the cabinet, the cable rack can be installed on the top of the

cabinet. The cable trough, however, is excluded to facilitate heat dissipation.

Prerequisite

The required over-cabinet supports should be available.

Procedure

Step 1 Use bolts M8 × 20 to fix the supports to the top of the cabinet, as shown in Figure 7-18.

Figure 7-18 Fixing the over-cabinet supports




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CAUTION

The spacing between two adjacent triangular supports must be an integer multiple of 50 mm.

Otherwise, the triangular supports cannot hold the cable ladder stably. The recommendedspacing is 1,250 mm, that is, each segment of the cable ladder is supported by two triangular

supports.

Step 2 Use bolts M6 × 20 and nuts M6 to fix the cable ladder to the supports, as shown in Figure7-18.

Figure 7-19 Fixing the cable ladder

----End

7.1.4 Installing the Outdoor Cable Rack

An outdoor cable rack can be installed on the floor or on the wall.

Context

CAUTION

When you determine the location of the cable rack, place the rectangular frame correctly, as





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Figure 7-20 Rectangular frame

7.1.4.1 Installing the Outdoor Cable Rack on the Floor

An outdoor cable rack can be installed on the floor if the cable rack cannot be mounted on the

wall.

7.1.4.2 Installing the Outdoor Cable Rack on the Wall

This topic describes how to install an outdoor cable rack on the wall.

Installing the Outdoor Cable Rack on the Floor

An outdoor cable rack can be installed on the floor if the cable rack cannot be mounted on the

wall.

Procedure


Step 2 Determine the location of the rectangular frame and accordingly mark the positions of the drillingholes. Ensure that each segment of the cable ladder is supported by two rectangular frames and

that the spacing between two adjacent rectangular frames is 1,250 mm.


Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80

expansion bolts, and feed the bolts vertically into the holes. Hammer the expansion bolts untilthe tubes are completely buried in the wall.

Step 5 Remove the f lat washers, spring washers, and nuts from the expansion bolts, and lead theexpansion bolts through the insulating pads.

Step 6 Lead the expansion bolts through the holes in the rectangular frame. Add in sequence theinsulating washers, large flat washers 8, spring washers 8, and nuts M8 to the expansion bolts,

and then fasten the M8 nuts to fix the rectangular frame to the floor, as shown in Figure 7-21.

Step 7 Place the cable ladder on the horizontal beam of the rectangular frame, align the holes on thelower side of the U-steel with the holes in the horizontal beam of the triangular support, and fix

the cable ladder to the rectangular frame by using bolts M6 x 20 and nuts M6, as shown in

Figure 7-21.




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Figure 7-21 Installing the outdoor cable rack on the floor

----End

Installing the Outdoor Cable Rack on the Wall

This topic describes how to install an outdoor cable rack on the wall.

Procedure


Step 2 Determine the location of the rectangular frame and accordingly mark the positions of the drillingholes. Ensure that each segment of the cable ladder is supported by two rectangular frames and

that the spacing between two adjacent rectangular frames is 1,250 mm.


Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80expansion bolts, and feed the bolts vertically into the holes. Hammer the expansion bolts until

the tubes are completely buried in the wall.

Step 5 Remove the flat washers, spring washers, and nuts from the expansion bolts, and lead theexpansion bolts through the insulating pads.

Step 6 Lead the expansion bolts through the holes in the vertical beam of the rectangular frame. Addin sequence the insulating washers, large flat washers 8, spring washers 8, and nuts M8 to the

expansion bolts, and then fasten the nuts to fix the rectangular frame to the wall. as shown in

Figure 7-22.

Step 7 Place the cable ladder on the horizontal beam of the rectangular frame, align the holes on thelower side of the U-steel with the holes in the horizontal beam of the triangular support, and fix




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the cable ladder to the rectangular frame by using bolts M6 x 20 and nuts M6, as shown in as


Figure 7-22 Installing the outdoor cable rack on the wall

----End

7.1.5 Connecting Cable Ladders

In actual installations, you may need to dock two cable ladders, to connect the cable ladders or

cable troughs in a T shape, to connect the cable ladder to the wall, or to lay the cable ladder

upwards or downwards. For details on how to connect the cable ladders, refer to the

corresponding topic.

7.1.5.1 Docking Cable Ladders

If a long cable ladder is required, you can use U-shape connecting pieces to connect several

cable ladders together. You then need to use three grounding cables to connect every two adjacent

cable ladders to ensure reliable grounding.

7.1.5.2 Connecting Cabling Ladders or Cabling Troughs in T Shape

If both cable ladders that are connected in a T shape are installed with cable troughs, or neither of them is installed with a cable trough, the two cable ladders or cable troughs should be

connected in a T shape. The method for connecting two cable ladders in a T shape is the same

as that for connecting cable troughs in a T shape. This topic illustrates how to connect two cable

ladders in a T shape.

7.1.5.3 Connecting the Cabling Ladder to the Cabling Trough in T Shape

If one of the two cable ladders that are connected in a T shape is installed with a cable trough

but the other one is not, a cable ladder and the cable trough of the other ladder should be connected

in a T shape.

7.1.5.4 Connecting the Cabling Ladder to the Wall

This topic describes how to use bracket angles, insulating pads, insulating washers, springwashers, flat washers, and expansion bolts to connect a cable ladder to the wall.




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7.1.5.5 Connecting Cable Ladders on Different Planes

The cable ladders on different planes can be connected by a front connection, side connection,

or oblique connection, as shown in

Docking Cable LaddersIf a long cable ladder is required, you can use U-shape connecting pieces to connect several

cable ladders together. You then need to use three grounding cables to connect every two adjacent

cable ladders to ensure reliable grounding.

Context

NOTE

If the length of the cable ladder is not an integer multiple of 2.5 m, cut off the surplus part. You then need

to apply paint to the sections for rust prevention and for visual appeal.

ProcedureStep 1 Connect two cable ladders by using U-shape connecting pieces. Use a grounding cable to connect

the first and the fourth bolts that connect the cable ladder and the U-shape connecting piece. as


Figure 7-23 Docking cable ladders

Step 2 Use a grounding cable to connect the second or the third bolt to the corresponding bolt. as shownin Figure 7-23.

----End




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Connecting Cabling Ladders or Cabling Troughs in T Shape

If both cable ladders that are connected in a T shape are installed with cable troughs, or neither

of them is installed with a cable trough, the two cable ladders or cable troughs should be

connected in a T shape. The method for connecting two cable ladders in a T shape is the same

as that for connecting cable troughs in a T shape. This topic illustrates how to connect two cableladders in a T shape.

Procedure

Use bracket angles, bolts, and nuts to connect the two cable ladders, and ensure the two ladders

are on the same level, as shown in Figure 7-24.

Figure 7-24 Ladders turned on the same level (no cable trough)

----End

Connecting the Cabling Ladder to the Cabling Trough in T Shape

If one of the two cable ladders that are connected in a T shape is installed with a cable trough

but the other one is not, a cable ladder and the cable trough of the other ladder should be connected

in a T shape.

Context

CAUTION

Ensure that the cable ladder and the cable trough are connected at the same level.




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Procedure

If one of the two cable ladders has a cable trough segment, use bracket angles, bolts, and nuts

to connect the two cable ladders. Figure 7-25 shows how to turn two cabling ladders at different

levels.

Figure 7-25 Turning the cable ladder at different levels

----End

Connecting the Cabling Ladder to the Wall

This topic describes how to use bracket angles, insulating pads, insulating washers, spring

washers, flat washers, and expansion bolts to connect a cable ladder to the wall.

Procedure

Step 1 Use expansion bolts M6 x 20 to connect the bracket angles to the cable ladder, as shown in①

in Figure 7-26.




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Figure 7-26 Connecting the cable ladder to the wall

Step 2 Use expansion bolts M8 x 80 to connect the bracket angles to the wall, as shown in② in Figure7-26.

----End

Connecting Cable Ladders on Different Planes

The cable ladders on different planes can be connected by a front connection, side connection,

or oblique connection, as shown in

Procedure

Step 1 Choose a cable ladder of corresponding length and use it as a climbing ladder.

Step 2 Use bracket angles, bolts, and nuts to connect the climbing ladder and the cable ladder. The cableladders on different planes can be connected by a front connection, side connection, or oblique

connection, as shown in Figure 7-27, Figure 7-28, and Figure 7-29.




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Figure 7-27 Front connection of cable ladders

Figure 7-28 Side connection of cable ladders




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Figure 7-29 Oblique connection of cable ladders

----End

7.1.6 Installing the Cable Trough

This topic describes how to connect and install the cable troughs.

Context

Troughs can be 200-mm or 400-mm wide. Thus, the cable troughs can be installed on the

following:

l 200-mm or 400-mm wide cable ladders

l 600-mm wide cable ladders

7.1.6.1 Connecting the Cable Troughs

If a long cable trough is required, you should connect cable troughs first and then install them.

7.1.6.2 Installing the Cable Trough on the Cable Ladder

This topic describes how to install a cable trough onto the cable ladder. The cable ladder can be

200-mm, 400-mm, or 600-mm wide.

7.1.6.3 Installing the Sloping Cable Trough

This topic describes how to install a sloping cable trough.

Connecting the Cable Troughs

If a long cable trough is required, you should connect cable troughs first and then install them.

Procedure

As the cable troughs taper, you can connect two cable troughs by feeding the thinner end of a

cable trough into the thicker end of the other one, as shown in Figure 7-30. The length of theinserted part must not exceed 250 mm.




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Figure 7-30 Connecting cable troughs

----End

Installing the Cable Trough on the Cable Ladder

This topic describes how to install a cable trough onto the cable ladder. The cable ladder can be

200-mm, 400-mm, or 600-mm wide.

Prerequisite

The cable ladder should be installed.

Procedurel Install a cable trough onto the 200-mm or 400-mm wide cable ladder.

1. Based on the width of the cable ladder, choose a cable trough of the same width.

2. Place the cable trough on the cable ladder.

3. Fix the cable trough to the cable ladder by using fixing clips. A combined cable trough

requires four clips, two on each side. The clips on both sides are laid symmetrically,

as shown in Figure 7-31.




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Figure 7-31 Installing a cable trough on the 200-mm or 400-mm wide cable ladder

l Install the cable troughs on the 600-mm wide cable ladder.

1. Combine a 200-mm wide cable trough with a 400-mm wide cable trough to build a

600-mm wide cable trough by using connecting clips. Three connecting clips are

required for combining two cable troughs.

2. Fix the cable trough to the cable ladder by using fixing clips. A combined cable trough

requires four clips, two on each side. The clips on both sides are laid symmetrically,

as shown in Figure 7-32.

Figure 7-32 Installing cable troughs onto the 600-mm wide cable ladder

----End




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Installing the Sloping Cable Trough

This topic describes how to install a sloping cable trough.

PrerequisiteThe cable ladder should be installed.

Context

NOTE

The actual slope of the cable trough can be smaller than the required one.

Procedure

Step 1 Cut off the upper side of the triangle aperture in the cable trough, as shown in Figure 7-33. Be

sure to apply paint to the surface of the cut sections.

Figure 7-33 Cutting off the upper side of the triangle aperture

Step 2 At the marked line, bend one part of the cable trough to the corresponding slope, as shown inFigure 7-34.




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Figure 7-34 Installing a sloping cable trough

Step 3 Fix the cable trough to the cable ladder by using fixing clips. Figure 7-35 shows an installedsloping cable trough.




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Figure 7-35 Installed sloping cable trough

----End

7.1.7 Installing Accessories

During the installation of the cable rack, the required accessories are the cable manager, endcover, bushing, and baffle ring.

7.1.7.1 Installing the Cable Manager

Cable managers are often installed on the cable ladder that lies on the top of the cabinet. The

installation method depends on whether a cable trough is installed. The quantity and locations

of the cable managers are site-specific.

7.1.7.2 Installing the End Cover, Bushing, and Baffle Ring

The bushing protects a cable from being damaged, the end cover enhances the appearance of

the cable, and the baffle ring prevents the cable from protruding.




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Installing the Cable Manager

Cable managers are often installed on the cable ladder that lies on the top of the cabinet. The

installation method depends on whether a cable trough is installed. The quantity and locations

of the cable managers are site-specific.

Context

CAUTION To align the cable manager with the cable rack, abide by the following

principles:

l If the cable rack is installed with a cable trough, fix the cable manager to the cable rack

through the lower row of holes in the cable manager.

l If the cable rack is not installed with a cable trough, fix the cable manager to the cable rack

through the upper row of holes in the cable manager.

Procedure

l Install the cable manager on the cable rack that is not installed with a cable trough.

Figure 7-36 shows the cable manager on the cable rack that is not installed with a cable

trough.

Figure 7-36 Cable manager on the cable rack that is not installed with a cable trough

l Install the cable manager on the cable rack that is installed with a cable trough.

Figure 7-37 shows the cable manager on the cable rack that is installed with a cable trough.




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Figure 7-37 Cable manager on the cable rack that is installed with a cable trough

----End

Installing the End Cover, Bushing, and Baffle Ring

The bushing protects a cable from being damaged, the end cover enhances the appearance of

the cable, and the baffle ring prevents the cable from protruding.

Procedure

l Install the bushing at the bottom edge of the cable trough, as shown in ① in Figure 7-38.

All the exposed bottom edges of the cable troughs must be covered by bushings.




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Figure 7-38 Installing the end cover, bushing, and baffle ring

l Cover all the exposed ends, as shown in ② in Figure 7-38. If allowed, cover all the ends

of the cable ladders.

l Mount the baffle rings onto both sides of the cable trough, as shown in ③ in Figure

7-38. A cable trough requires four baffle rings. The baffle rings must be evenly mounted

on both sides.

----End

7.2 Installing the NodeB Grounding Bar

The grounding bar is used to connect PGND cables of the cabinet.

Context

Figure 7-39 shows the grounding bar of the NodeB.

Figure 7-39 Grounding bar

(1) Bolt M8




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NOTE

l Install the indoor grounding bar on the wall that is as high as the cable rack and close to the cabinet.

l Install the indoor grounding bar horizontally on the wall.

l Apply insulating washers to the expansion bolts to insulate the grounding bar from the wall.

Procedure

Step 1 Determine the installation position according to the engineering design.

Step 2 Install the indoor grounding bar horizontally on the wall by using expansion bolts, as shown inFigure 7-40 and Figure 7-41.

Figure 7-40 Installing the grounding bar

(1) Bolt M12 (2) Spring washer 12 (3) Large flat washer

(4) Insulating washer a (5) Grounding bar (6) Expansion tube and nut

Figure 7-41 Sectional view of the grounding bar

(1) Bolt M12 (2) Spring washer 12 (3) Large flat washer (4) Insulating washer a

(5) Grounding bar (6) Insulating washer b (7) Expansion tube and nut




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Step 3 Use a PGND cable to connect the indoor grounding bar and the equipment room grounding bar.

----End


01-07 preparing for auxiliary facilities of the bts3812e site

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