Chapter 4 Pace Allocation, Layout, Cable Installation & Pathwys

Question 1

What is the minimum
amount of floor space that
should be allocated
for an ER?

Answer 1

12 M2 (120 FT2) FOR BUILIDNGS FOR A GROSS AREA OF UP TO 50,000 M2 (500,000 FT2)

Question 2

What can the ICT designer
use to determine the
minimum size of the ER if
the specific equipment that
will be used is unknown?

Answer 2

THE AMOUNT OF FLOOR SPACE THAT THE ROOM WILL SERVE.

Question 3

What industry average is
used to calculate space for
work areas?

Answer 3

9.3 M2 (100 FT2)

Question 4

What is the minimum size
permitted for an ER that
will serve fewer than
200 work areas?

Answer 4

14 m2 (150 ft2)

Question 5

Name five factors that are
used to determine the
minimum working
clearance around
equipment in the ER.

Answer 5

1. VOLTAGE
2. EXPOSURE TO LIVE PARTS
3. EQUIPMENT ORIENTATION
4. AHJ
5. LOCATION OF GROUNDED PARTS

Question 6

How much floor area is
typically required for
equipment cabinets
in an ER?

Answer 6

0.9 m2 (10 ft2) OF FLOOR AREA PLUS AN ADDITIONAL 0.9 M2 ( 10 FT2) FOR WORKING CLEARANCE.

Question 7

Name two common types
of cable pathways that are
used to route bulk cables
within the ER.

Answer 7

1. WIRE MESH CABLE TRAY OR CABLE RUNWAY (LADDER TACK CABLE TRAY).
2. ACESS FLOORS (RAISED FLOORS)

Question 8

What is the minimum
amount of access
headroom that is required
when a cable tray system is
installed in an ER?

Answer 8

203 MM (8 IN)

Question 9

What is the recommended
amount of access headroom
for a cable tray system the is
installed in an ER?

Answer 9

305 MM (12 IN)

Question 10

True or False
All cable must be plenum
rated when cooling or
return air is provided under
access flooring.

Answer 10

True. When cooling or return air
is provided under access
flooring, all cabling must be
plenum rated.

Question 11

Name two reasons that
strapping, hooking, and
lashing are not suitable
as the primary means
of cable distribution
within an ER.

Answer 11

1. LIMITED BULK CABLE CAPACITY
2. INABILITY TO ACCOMMODATE CHANGE

Question 12

Name two types of cable
pathways that are
commonly used to allow
telecommunications cables
to enter and exit the ER.

Answer 12

1. SLOTS AND SLEEVES
2. CONDUITS

Question 13

Sleeves and slots are the
most common method for
routing cable through
building walls and floors.
Why are sleeves preferred?

Answer 13

SLEEVES ARER PREFERED BECAUSE THEY ARE EASIER TO FIRESTOP.

Question 14

How many sleeves should
be provided to run cable
to an ER?

Answer 14

A MINIMUM OF FOUR 103 MM (4 TRADE SIZE) SLEEVES WITH AT LEAST ONE SPARE SLEEVE.

Question 15

Why should sleeves and
slots be specified before
the building is constructed?

Answer 15

BECASUE CORING (CUTTING HOLES THROUGH CONCRETE):
1. IS EXPENSIVE
2. CAN CREATE DUST OR WATER DAMAGE
3. CAN COMPROMISE STRUCTURAL INTEGRITY

Question 16

What is the purpose of
using a bushing on the
end of a conduit?

Answer 16

IT HELPS AVOID DAMAGING THE CABLE SHEATH.

Question 17

Name three reasons conduits
are not recommended for use
in an ER unless they are
required by code.

Answer 17

THEY ARE GENERALLY NOT RECOMMENDED BECAUSE THEY:
1. ARE EXPENSIVE
2. HAVE LIMITED BULK CAPACITY
3. ACCOMMODATE CHAJGE POORLY

Question 18

Why should ER cross-
connects be located near
the end of backbone
pathways?

Answer 18

BECAUSE IT WILL MINIMIZE THE NEED FOR CABLE ROUTING IN THE CROSS-CONNECTS