Chapter 4 Cards

Question 1

Name the terms to describe telecom spaces

Answer 1

Er, tr, ef, te

Question 2

How much clearance do racks in an equipment room need between them

Answer 2

1m or 3.3 ft

Question 3

What should you do if an equipment room layout hasn’t been provided?

Answer 3

Prepare one for approval before beginning work

Question 4

Where Conduit ends should be positioned adjacent to?

Answer 4

To the left side of the back board if there’s a single piece of plywood

Or

In the left most corner of the room where multiple sheets of plywood are installed around perimeter walls of the room

Question 5

For ICT systems what grade of plywood should the back board be?

Answer 5

A/C grade with the A side exposed to the interior of the tr and the C side is placed against the building structure or cabinet wall

Question 6

What height about the finished floor should you start mounting the plywood at?

Answer 6

150mm or 6 inches

Question 7

How many coats of fire retardant paint is required if the plywood isn’t already coated?

Answer 7

Two coats of fire retardant paint

Question 8

What dimensions should plywood sheets used for backboards be installed at?

Answer 8

150mm or 6 inches above finished floor( aff) and with an installed height of 8.5 ft

Question 9

When installing plywood backboards how much longer than the depth of the wall should the galvanized screws be?

Answer 9

12.7 mm or .5 inches liner than the depth of the wall covering including the plywood.

Question 10

What size should your toggle bolts be if you have to use them while installing plywood backboards…

Answer 10

A minimum of 6.3 mm or .25 in and must be good enough in length to allow the toggle to seat behind the framed wall after installation

Question 11

What should a finished backboard installation look like?

Answer 11

It will look flush with counter sunk screws to avoid splitting the board

Question 12

How far should toggle bolts be separated in a back board installation?

Answer 12

2 inches from the edge of the plywood sheet an a max of 24 in centers

Question 13

What are common installation and set up issues that floor or wall mounted cabinets and racks have

Answer 13

Attachment.
Bracing.
Design layout.
Cable routing and management.
Bonding and grounding( earthing).

Question 14

When it’s required the top of the floor mounted rack must be connected to what?

Answer 14

The wall, support barriers, cable runway, or cable tray.

Question 15

What is one RMU equal to?

Answer 15

45mm or 1.75 inches

Question 16

What is the minimum spacing equipment must have to be placed in racks?

Answer 16

1 rmu

Question 17

Where should labels be placed on cabinets and racks

Answer 17

At the top of them and centered between the sides

Question 18

What is generally recommended about the cabinets placement?

Answer 18

That they should be placed with one edge flush with the floor tile cut line to ensure that no unnecessary floor tiles are used and to minimize distance to reach under cabinets

Question 19

What are the four methods that can be used to secure cabinets or racks to the underfloor or permanent slab

Answer 19

• attachment to metal struts that are captured below the floor by two or more access stringers
• attachment to metal struts below access floor that are suitably attached to the permanent floor
• attachment using threaded rod directly to the permanent floor
• attachment to channel bases bolted to floor slab

Question 20

you shouldn’t adjust or shim an anchor point more than what amount?

Answer 20

.5inches or 13 mm

Question 21

What is the minimum amount of clearance is needed in every race way to allow cable bundles to lay properly?

Answer 21

2 inches minimum

Question 22

When foam matting is used as an underfloor pathway or containment how thick should it be?

Answer 22

A minimum of half an inch thick and fill the aisle between the floor pedestals

Question 23

When underfloor cable trays run in parallel and are stacked directly above each other what is the amount of clearance needed between layers of the tray

Answer 23

12 inches but no less than 6 inches

Question 24

Should d rings be used as a substitute for ladder rack or cable tray?

Answer 24

Definitely not

Question 25

What does an ef typically contain?

Answer 25

The entrance transition point for ap or sp services to the building and several elements of telecom bonding and grounding infrastructure

Question 26

What is the te dedicated to ?

Answer 26

The telecom function and related support facilities of a specific work group

Question 27

Where should the tr be located on a floor?

Answer 27

It should be located on the same floor as the work group it serves

Question 28

What kind of access should a te have?

Answer 28

It should be accessible but be restricted to people with keys to get into them

Question 29

If a door is hinged how should the enclosure be mounted?

Answer 29

It should be mounted that the door swings open a minimum of 90 degrees or provides unobstructed access to the inside of the enclosure

Question 30

How many non switched 120 vac/ 20 A branch circuits with a NEMA 5-20R duplex receptacle should be available in each TE

Answer 30

A minimum of 1 dedicated of the branch circuits should be available for each equipment cabinet or rack in a te

Question 31

How many lux or foot candles should light be measured at within a TE

Answer 31

538 lux or 50 foot candles

Question 32

What are examples of cabling support systems?

Answer 32

Plywood back boards, clamps, rings, and hangers Cable trays with supporting hardware Cable runway and associated hardware Conduits Enclosed cabling pathways J hooks

Question 33

How far should you be from electric motors and transformers to reduce emi

Answer 33

1220mm or 48 in

Question 34

How far should you be away from neon lamps to reduce emi

Answer 34

130mm or 5 inches

Question 35

How far should you be from arc welders to reduce emi

Answer 35

31.5 inches or 800mm

Question 36

What are the kinds of fasteners

Answer 36

Screws Bolts nuts and washers Specialty fasteners

Question 37

What is a bridle ring?

Answer 37

A metal ring formed out of galvanized wire stock with one side open

Question 38

Where should outlet boxes be located?

Answer 38

Next to a wall stud or frame member and it should be at least 4 in away from all other wall members

Question 39

What size of threaded rod do heavy duty installations use

Answer 39

5/8 size rod

Question 40

What is the size range that cable retaining posts are available in?

Answer 40

6 inches-12inch lengths to allow cables to be installed to a depth exceeding the cable runways

Question 41

Where should supporting attachments be applied on a cable tray?

Answer 41

Not more than 2 ft from the end of each side of a joint between two sections. Additional supports are required every 5ft thereafter

Question 42

What is a fish tape?

Answer 42

A steel or fiber glass wire rigid enough to be pushed through conduit or in longer runs to a pull box

Question 43

What are the air propelled devices used to run pull string?

Answer 43

A vacuum and a compressed air bottle or mechanical blower

Question 44

What’s the first step of placing pull string in conduit with a fish tape?

Answer 44

Determine length of fish tape required and after estimating add a few feet to each run to make sure you have enough fish tape

Question 45

Is the poke through method a recommended as a horizontal cabling solution

Answer 45

No there is a lot of draw backs to this method

Question 46

When are floor openings for poke-thru devices performed?

Answer 46

They’ll be performed either during the floor construction for a new building by a gc or by a speciality contractor in an existing building

Question 47

What is the max amount of cables open top cable supports should be used for

Answer 47

50

Question 48

How should open top cable supports be installed

Answer 48

They should be attached to the buildings structure and installed on a center spacing of 4-5 feet.

Question 49

How much clearance should open top supports be installed to have between the cabling and cable supports

Answer 49

A minimum of 3 inches

Question 50

What are the two types of couplings used to join emt together

Answer 50

Compression and set screw

Question 50

To avoid damaging the jacket how should ent be fastened

Answer 50

It should be securely fastened every 35.4 inches so it doesn’t bend when pulling cable

Question 51

How much length should FMC runs be limited to if it’s needed to be used

Answer 51

20 ft and increase the conduit diameter by one trade size.

Question 51

Should conduit bodies designed to handle electrical wiring systems be used in telecom cabling

Answer 51

Absolutely not

Question 52

How many 90 degree bends are allowed in any one conduit segment?

Answer 52

No more than two 90 degree bends are allowed.

Question 53

When might a third 90 degree bend in a single conduit segment be acceptable

Answer 53

If any of these things happen: The run doesnt exceed 33 ft The conduit size is increased to the next trade size If one of the bends is located within 12 in of the cable feed end. ( this exception applies only to placing operations where cable is pushed around the first bend)

Question 54

What size range are hand benders allowed to bend?

Answer 54

1/2 trade size up to 1 1/4 trade size

Question 55

What are the required bend radius rules when installing conduit?

Answer 55

If conduit is over 2 in. (53 mm), the bend radius must be 10× the internal diameter. If it is 2 in. (53 mm) or smaller, the bend radius must be at least 6× the internal diameter.

Question 56

When optical fiber cable is being used how many inner ducts should you use and what sizes should they be?

Answer 56

3 inner ducts Two at 1.5 in and one at 1 in inside conduit designed for this purpose.