Term
| Why is grounding important? |
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Definition
| It provides for proper equipment operation and personnel safety. |
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Term
| Aside from manufacturers requirements, which other standards must you adhere to? |
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Definition
| a.Commandant Instructions, Local and NEC codes and Shipboard grounding standards. |
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Term
| Commandant Instructions list what minimum grounding requirements? |
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Definition
b.Ground path maximum resistance of 25 ohms (path between equipment and true earth ground)
c.A 10 foot, ¾ inch diameter driven ground rod.
d.A ground resistance reading using the fall of potential method for all grounding rods.
e.A maximum ground resistance reading using the fall of potential method of 10 ohms. |
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Term
| What does fire resistance test rating mean? |
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Definition
| The time (in hours) that a material or assembly of materials will withstand the passage of flames and heat during specific tests. |
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Term
| What are the two ratings of firestopping? |
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Definition
F Rating:
a.Does not permit flames to pass through the firestop.
b.No auto-ignition on the unexposed side.
c.Must pass the hose strength test (a strength test which simulates fire hose water pressure).
T Rating:
a.Meets F rating criteria.
b.Prevents transferred heat (>325 degrees °F) to the unexposed side. |
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Term
| What are two types of firestop systems? |
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Definition
| Mechanical and Non-Mechanical. |
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Term
| What does mechanical firestopping entail? |
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Definition
| Commonly used on vessels and dual purpose devices providing both firestopping and watertight integrity. Advantages of mechanical systems is their flexibility in configuration and reconfiguration. |
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Term
| What does non-mechanical firestopping entail? |
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Definition
These systems are the most common form of stopping you will utilize:
Caulks, foam, masonry materials, pillows, putties and sheets. |
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Term
| What section of the NEC references the requirement for plenum cable in air handling spaces? |
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Definition
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Term
| Tempest requirements are based on what? |
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Definition
| Security concerns over unwanted emissions of electrical magnetic interface (EMI). |
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Term
| What tempest requirements must be met when running cables through a secret area? |
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Definition
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Term
| List the general Tempest requirements you must consider? |
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Definition
a.You must comply with MIL-STD_1680B.
b.The secure area must not be used as a distribution point for an area outside the secure area.
c.Keep the pair count to a minimum entering and leaving the secure space.
d.Remove all unused cables entering and leaving the secure space.
e.Secure all access points to the secure space.
f.Do not leave any open pairs. |
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Term
| What is adequate free space around a PBX? |
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Definition
| A three foot working clearance on all sides. |
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Term
| What are the preferred methods of fire protection in a telecommunications equipment area? |
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Definition
| Carbon Dioxide or Halon system. Sprinkler should be used with a dry pipe system only but avoided if at all possible. |
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Term
| What are the three types of spaces recognized by TIA/EIA-569 standards? |
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Definition
| Telecommunication Closets, Equipment Rooms and Facility Entrances. |
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