0
CABLE and WIRE are not the same thing.
Cables are sized by the diameter of the longest side (romex isn't round, it's an oval, compared to CAT 5, which is round)
Wires are sized based on the type of insulation and gauge of copper.
Then you take that info to the code book. A chart tells you the answer. BEWARE: multiple cables or wires in a conduit changes the equation.
Whether or not more will fit, the only correct way to size cables or wires is to use the Code Book.
For UK InstallationsThis topic is covered in Appendix 5 of the On-Site Guide supplement to BS 7671:2008 Requirements for Electrical Installations (the 'IEE Wiring Regulations'), although this Appendix only relates to the ease with which cables can be drawn in, and does not take into account the effect of 'grouping' (i.e. the effect that the temperature of each conductor will have on the rest). The number of cables permitted depends upon (1) the total cross-sectional area of all the cables drawn in, (2) the length of run, and (3) the presence of bends.
The effect of 'grouping' is to reduce the number of cables actually allowed within a conduit (or other enclosure), because, as the number of circuits increases, the current-carrying capacity of the cables reduces. Guidance on this is provided through 'space factor', which is the ratio of the (total csa of all the cables) to (the internal csa of the conduit), expressed as a percentage, with the maximum permissible space factor being 40%. The remaining 60% space is required to allow the dissipation of heat from the cables. (As the first answer indicates, the csa of a flat cable is based on the maximum width of that cable).
The width of the cable tray is determined by the size of the cable to be installed into the duct system plus the total insulation needed to meet regulation 392.80(A)(2)(d) UL standards.
Add your answer:
Earn +20 pts
What is the type and size of cable gland or 2 core cable?
To answer this question the size of the cable or the amperage of the load is needed to calculate the correct wire size and connectors to fit the cable.
Formula for working out cable size?
There is actually no specific formula used to work out cable size. In order to determine the type of cable you need and the size you need, you need to know the source of the supply, the voltage of the system, the ambient temperature, and the method you plan on laying out the cable.
What size of wire use for 3kw motor 380volts 3phase?
How to calculate a cable size of 3kw motor
How do you calculate the voltage drop for 238 KW 3 phase 415 V and length of circuit is 20 meters?
You need also to know the resistance of the cable. First you establish what the current of the load is. Then from that you calculate the wire size. From a wire size chart you find the wire resistance. Then use the formula I (squared) x R.
What cable size needed for 3KW geyser?
You need to know the amperage requirement of the pump and then you can calculate the wire size.
How do you calculate cable gland size?
4cx95mm aws which size of cable gland
What is the type and size of cable gland or 2 core cable?
To answer this question the size of the cable or the amperage of the load is needed to calculate the correct wire size and connectors to fit the cable.
How do you calculate the cable size for a run of 30 meters?
To calculate the cable size for a 30-meter run, you need to consider the current rating of the circuit, voltage drop limits, and the type of cable insulation. Use a cable sizing calculator or consult a professional electrician to determine the appropriate cable size to ensure safety and efficiency of the electrical installation.
What is the formula to calculate Conduction current in a coaxial cable?
Jc=sigma.E
Formula for working out cable size?
There is actually no specific formula used to work out cable size. In order to determine the type of cable you need and the size you need, you need to know the source of the supply, the voltage of the system, the ambient temperature, and the method you plan on laying out the cable.
How calculate the cable size when give current?
The NEC has a table that shows what size cable to use with each amperage and where it can be used.
What is the Formula to know about of dc cable size in mm?
how to know dc cable sizes
What size of wire use for 3kw motor 380volts 3phase?
How to calculate a cable size of 3kw motor
Could you Calculate cable size for 100 kw load?
Yes I could. How?
How do you calculate the voltage drop for 238 KW 3 phase 415 V and length of circuit is 20 meters?
You need also to know the resistance of the cable. First you establish what the current of the load is. Then from that you calculate the wire size. From a wire size chart you find the wire resistance. Then use the formula I (squared) x R.
What cable size needed for 3KW geyser?
You need to know the amperage requirement of the pump and then you can calculate the wire size.
For 100kw which cable size is good and how to find out cable size?
100 kw is the power drawn by the load. to calculate the cable size you need to know the voltage. From that you can calculate the current. this decides the cable size. for example if the voltage is 400Volts then the current flowing in the circuit when the load is 100 KW will be 250 amps. (100,000/400). for 250 amps to flow with out causing excessive heating of the cable the cross sectional area of the copper cable should be 150 sq mm.for a round cross section the diameter will be roughly 15mm.
