A Trusted Online Cable Size Calculator

https://app.box.com/s/lcoqq1aaq2o84f1spj0y

Make sure local codes are complied.

= unobtainium.

I downloaded it. It looks very official.

I am only qualified to change 12V DC and 120V AC light bulbs.

Then, only if they are not anchored by fasteners.

Always consult NFPA 70e and local codes.

Sorry but when voltages drop to low values (LV) the cable size is determined much more by the allowed voltage drop at the load than any simple chart can show. The frequency of the signals, cable capacitance, skin effects, VSWR all will effect the signal integrity.

If you are instead asking about residential/commercial power distribution of 50/60 Hz AC power then follow the authorized codes for the installation site. The common ones are repeatedly cited here.

You must be talking about ELV. Residential/Commercial power distribution works in the LV range...

I generally do a search on AWG and select the table with the information I need.

I am generally working in SELV so voltage drop and heating ie power loss when there is not much to lose! are most important with cost, size and weight a close second ..... it is a balancing act!

One other important thing to consider is how flexible your cable needs to be - this is critical in selecting the stranding you choose.

again Google is your friend.

Do you use a national electrical code where you are?

British Standard 7671 is available via many websites.

Dear Blackpaper

Thanks for a very good initial cable size calculator.

https://app.box.com/s/lcoqq1aaq2o84f1spj0y.

Thank Jignesh... :)

http://www.doncastercables.com/technical-help/

Dear Blackpaper

Do you please put some light on the need of below two things written in given cable size calculator in Excel?

1. Row # 19 >> No of Tray.

2. Row # 22 >> No. of Runs of selected cables.

Both are self explanatory.

1. Number of parallel runs of cable trays if you have any. The closeness of cables together can cause mutual heating. If you have one tray above another, there are more cables close together and hence more heating.

2. When the load current exceeds the capacity of the highest available cable size, then multiple runs of cables are to be used to share the load. For eg, if you can use a 4c-300 mm2 cable for a 500A load, then 2 runs of the same would be needed for 1000A since 4c-600 mm2 is not avalable.

Understood. thanks.