Chapter 22 - Special Design Considerations

Question 1

What types of cables does TIA-1005 recognize for special occupancies?

Answer 1

• 4pair category 5e or higher 100-ohm balanced twisted-pair cabling
• 2pair 100-ohm balanced twisted pair cabling
• Multimode optical fiber cabling
• Singlemode optical fiber cabling
• Bundled and hybrid cabling

Question 2

What does MICE stand for?

Answer 2

MICE is used to identify environments where cabling can be exposed to harsher environments
Mechanical 
Ingress 
Climatic/chemical 
Electromagnetic

Question 3

What are the three levels of MICE?

Answer 3

• MICE 1 relates to environmental conditions found in a commercial environment
• MICE 2 relates to light industrial environment
• MICE 3 relates to heavy industrial environment

Question 4

What does the X and Y represent in Ingress Protection (IP) codes?

Answer 4

X represents capability to resist penetration of foreign objects.
Y represents resistance to water.

Question 5

What are the “X’ values for different levels of protection for IP codes?

Answer 5

0 - unprotected
1 - protection from penetration of solid objects >= 50mm (2in)
2 - protection from penetration of solid objects >= 12.5mm (0.5in)
3 - protection from penetration of solid objects >= 2.5mm (0.1in)
4 - protection from penetration of solid objects >= 1mm (0.04in)
5 - partially protected from dust (dust will not penetrate to interfere with proper operation or safety)
6 - dust tight

Question 6

What are the “Y’ values for different levels of protection for IP codes?

Answer 6

0 - Unprotected
1 - protected from vertically falling drops of water
2 - protected from vertically falling drops of water, while enclosure is tilted up to 15 degrees
3 - protected from water sprayed up to 60 degrees from both sides of vertical
4 - protected from water splashed from all directions
5 - protected from jets of water spraying from all directions
6 - protected from powerful jets of water spraying from all directions
7 - protected from immersion in water for 30 minutes at a depth of at least 1m (3.3 ft)
8 - protected from continuous immersion in water for time and depths more severe than listed in code 7