Cable Sizing: How External Factors Impact Section Area

In summary, the method of cable installation and other external factors, such as regulations and codes, can influence the required cable cross sectional area for a given circuit. This includes considering the safe maximum temperatures for different types of cables, as well as following specific guidelines and regulations for AC Mains cables.
  • #1
nothing909
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Homework Statement


How does the method of cable installation and other external factors influence the required cable cross sectional area for a given circuit

Homework Equations

The Attempt at a Solution


I've been searching for the answer for this for ages. I only find answer relating to types of TYPES of cable installation to use or TYPES of installation methods to use depending on external factors. I can't find anything that talks about cable sizing and what factors influence it, can someone help me out?
 
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  • #2
nothing909 said:

Homework Statement


How does the method of cable installation and other external factors influence the required cable cross sectional area for a given circuit

Homework Equations

The Attempt at a Solution


I've been searching for the answer for this for ages. I only find answer relating to types of TYPES of cable installation to use or TYPES of installation methods to use depending on external factors. I can't find anything that talks about cable sizing and what factors influence it, can someone help me out?
It depends on what kind of cables you are talking about, but in the end it comes down to safe maximum temperatures.

If you are asking about sizing AC Mains cables in home or industrial installations, there are regulations and codes that cover wire type and gauge. The National Electric Code (NEC) applies in the USA, for example.
 

1. How do temperature and altitude affect cable sizing?

The higher the temperature, the more current a cable can carry before overheating. Altitude also affects cable sizing because the lower air pressure at higher altitudes means less heat dissipation, which can result in a lower current-carrying capacity for the cable.

2. What is the impact of external factors on the section area of a cable?

External factors such as temperature, altitude, and ambient conditions can affect the section area of a cable, which in turn affects its current-carrying capacity and overall performance. These factors must be taken into consideration when determining the appropriate cable size for a specific application.

3. How does the type of insulation used in a cable affect its section area?

The type of insulation used in a cable can impact its section area by affecting its resistance to heat and current flow. Different types of insulation have different thermal and electrical properties, which can impact the overall size and performance of a cable.

4. What is the importance of considering external factors when sizing a cable?

Considering external factors when sizing a cable is crucial because it ensures that the cable is able to safely and effectively carry the required amount of current without overheating. This can prevent potential hazards such as electrical fires and equipment failure.

5. How do I calculate the appropriate section area for a cable given external factors?

To calculate the appropriate section area for a cable, you must first determine the expected current load and take into account external factors such as temperature, altitude, and ambient conditions. Then, using a cable sizing calculator or formula, you can determine the optimal section area for the cable to safely and efficiently carry the required current.

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