Table of Contents

## How is cable section calculated?

To calculate the Cable Sizing one needs to divide the voltage running through the cable by the target current. For instance, If your wire has a voltage current of 150 Volts and your target is 30 then you divide 150/30. This gives you your target resistance of 5 which is required.

## How is cable ampere calculated?

Full Load Current = (KVA · 1000) / (1.732 · Voltage): Full Load Current = (100 · 1000) / (1.732 · 415) = 139 Amp….Let’s select 3.5 core 70 Sq.mm cable for single run.

- Current capacity of 70 Sq.mm cable is: 170 Amp,
- Total derating current of 70 Sq.mm cable = 170 · 0.93 = 159 Amp.

**What is the formula of cable?**

Cable Design Formulas

Weight | = | 1362 Gt ( ( d+t )+( d+3t ) f ) = lbs./1,000 ft. |
---|---|---|

G | = | specific gravity of tape |

t | = | tape thickness in inches |

d | = | diameter of cable under tape in inches |

f | = | multiplying factor from % lap |

### What is a 32AMP supply?

AMPs relate to the power required for your hot tub to perform. 13AMP (plug and play) is the power that most of your household items run off of. A 32AMP requires more power and you usually need a specific electrical supply installed by an electrician.

### Will 4mm cable carry 32 amps?

Yes, provided the run is not too long, check volt drop, 4mm is ok on 32 A CB but not on BS 3036 rewireable. Use a 16A commando style plug and socket or hard wire it.

**What is the formula to calculate wire size?**

Here’s how you calculate AWG (American Wire Gauge) from the diameter of a wire: Find the ratio (R) of the wire diameter to either 0.005 inches or 0.127 mm. Use the equation n = -39 × log92(R) + 36 to find the AWG number.

#### What is the difference between 16 amp and 32 amp?

To answer just your original question, the only difference you will see if you decide to go for the 32A version is that the cable between the chargepoint and your consumer unit/fusebox will be slightly thicker. Most manufacturer’s designs of chargepoint look the same for 16A vs 32A.

#### How many amps does a 32amp hot tub use?

32 amp

13 amp models – known as ‘plug-and-play hot tubs’ – run on a standard three-pronged plug socket, whereas 32 amp hot tubs require a 32 amp electrical supply.

**Can you have a 32AMP radial circuit?**

To answer your first point, it depends on the size of the cable on the radial circuit in question. The usual 2.5mm cable should be protected by a breaker no larger than 20amps (if a radial circuit as opposed to a ring). If it is a 4mm cable or larger, then a 32amp breaker is sufficient.

## What wire do I use for 40 amps?

The minimum wire gauge for a 40-amp circuit breaker is 8-AWG solid core copper wire. Many installers will use a larger gauge wire such as a 6-AWG wire which offers flexibility for future expansion, and still put a 40-amp breaker on this circuit, which is an acceptable practice.

## How is HT cable current calculated?

1. Cable current carrying capacity

- Ifull-load = 12.5 × 106 / 1.73 × 20 × 103 = 361 A.
- Therefore subsequent current rating of cable to be 361 / 0.97 × 0.84 = 443 A.
- Isc = K × A / √t.
- Isc = 240 × 143 / √1 = 34.4 kA.
- Vd = Ifl × XL × sinφ + Ifl × R × cosφ volts.
- If = (1000 × 0.15) / (1 + 0.15) = 131 A.

**What is the difference between 16 amp and 32 amp charging cable?**

16Amp vs 32Amp EV Charge Cables Generally the higher the Amp’s, the quicker they achieve full charging. A 16 amp charging point will charge an electric car in around 7 hours, while at 32 amps, the charge will take around 3 1/2 hours.