User:Zen fer tech

Cable Calculation
based on United Kingdom Electrical Installation guides. BS7671 (wiring regulation) has detailed information, there are tables that will give you detailed information and values that you would use in your calculations. on-site-guild gives a more practicable view. tables chapter 41-43 protective devices and their Zs value.

protective devices BS3036 rewire-able fuse (still present in older homes) BS88 BS60898 (circuit breaker)

method used

1 find your design load currents (Ib)

2. select the closest protective device to your design current (but not less then it)

3. now find any cable corrections that may need to be used.

4. method of installation needs to be decided. 5. corrections factors are Ca- ambiant temprature, Cg- grouping of cables, Ci- insulation factors, C..-(0.7..) thses are found in appendex 4 (BS7671) these are used to get the cable tabulated value (It). 6. check tables for the closest cable that matches cable tabulated value. this cable will be now be the current carring capacity of the cable (Iz)

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