Calculation Notes

Cable sizing compiles with:
 - BS 7671, IEE Wiring Regulations

Cable size is selected as follows:
  1. Cable is calculated on current capacity
  2. Voltage drop is calculated (and cable size increased if necessary)
  3. Fault level withstand is calculated (and cable size increased if necessary)

Tip: if you don't want fault level to be considered, you can set it to a very low value.

To find out more about how the cable sizing tool works, please see:
- Cable Calculator - myCableEngienering


CPC Sizing

To select or size Circuit Protective Conductors (CPC ), please use our:
 - Circuit Protective Conductor Sizing Tool

Metric AWG Conversion

To convert between Metric and American Wire Gauge, you can use our:
- Metric AWG Conversion Table

Are We Losing Professional Integrity

I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...

3 Phase Loads

Three phase systems are derived from three separate windings, either connected in delta or star (wye). Each winding can be treated separately, leading...

Standard Cable & Wire Sizes

IEC 60228 is the International Electrotechnical Commission's international standard on conductors of insulated cables. Among other things, it defines a...

IEEE Winds of Change

IEEE TV has a part series of videos on wind power and it's implication. For a really good overview to the technologies and issues around wind power, these...

Welcome back Bottle

‘Kept looking at a card, y’see? Kept looking at it. Welcome back Bottle. Gods below welcome home. The Crippled God A Tale of the Malazan Book of the...

Material Properties

Everything physical in electrical engineering from insulations to conductors revolves around materials. Here we are listing common materials along with...

What does N+1 mean?

The term 'N+1' relates to redundancy and simply means that if you required 'N' items of equipment for something to work, you would have one additional...

Earth Electrode Resistance

Earthing of electrical systems is essential for the correct functioning and the protecting of life and equipment in the event of faults.  The earth electrode...

Switchboard - Forms of Internal Separation

IEC 61439 'Low-voltage switchgear and controlgear assemblies', specifies standard arrangements of switchboard (call forms of internal separation). The...

Frame Leakage Protection

While not as popular as it once was, frame leakage protection does still have some use in some circumstances.  In essence frame leakage is an earth fault...

Our website uses cookies so that we can provide a better experience.
To learn more about what cookies are and how to manage them visit