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Frequently Asked Questions.

Home › Frequently Asked Questions › Calculations and Standards

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Caneco BT advises me “off-calculation (voltage drop)”. What can I do?

In certain cases, the admissible voltage drop may be exceeded. In such cases:

1- Check the voltage drop allowed by the type of connection and the voltage drop in the source.
2- Retest the upstream cables to carefully ascertain which ones to over-dimension for calculation of the downstream circuits.

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Caneco BT

In certain cases, the admissible voltage drop may be exceeded. In such cases:

1- Check the voltage drop allowed by the type of connection and the voltage drop in the source.
2- Retest the upstream cables to carefully ascertain which ones to over-dimension for calculation of the downstream circuits.

Why, downstream of a single-phase circuit-breaker, does Caneco BT propose a circuit-breaker with a higher breaking capacity (e.g. C60L single-phase downstream of a C60N)?

When calculating the protection, Caneco BT takes the temperature de-rating into account...

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Caneco BT

When calculating the protection, Caneco BT takes the temperature de-rating into account.
For the same consumption, but at a different temperature of installation, an over-requirement circuit-breaker might in principle be proposed.

Example: for a working current Ib=16.1A at 30°C, Caneco BT will suggest a C60L 16A as this is designed to withstand up to 16.9A, whereas the C60N doesn’t go above 16A.

Why is it impossible to obtain a proposal for a cable downstream of a 20kVA inverter?

These inverters require short-circuit currents that are often very low (in the region of 2 to 3 In). This means that the short-delay device placed downstream of your inverter has to be set to a lower value...

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Caneco BT

These inverters require short-circuit currents that are often very low (in the region of 2 to 3 In). This means that the short-delay device placed downstream of your inverter has to be set to a lower value.

If that isn’t possible, you can trip the thermal switch of the protective device so long as you comply with the relevant provisions (see NF C 15-100 para. 4-435.1 and the ensuing articles).

Why does Caneco BT propose a large cross-section cable for a lighting circuit?

Several criteria may result in an overdimensioned cable. These are shown in the result sheet on the left of your screen to help you to define the search required to reduce the cross-section...

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Caneco BT

Several criteria may result in an overdimensioned cable. These are shown in the result sheet on the left of your screen to help you to define the search required to reduce the cross-section.
You can find further information on these criteria in the glossary of the Caneco BT User Manual. (PDF format).

I don’t understand what “Equipot” means.

Equipot = (Main) Equipotential.

Equipotential is governed according to the definition given in NF C 15-100 (para. 544.1)...

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Caneco BT

Equipot = (Main) Equipotential.

Equipotential is governed according to the definition given in NF C 15-100 (para. 544.1).
The equipotential bonding cable is situated at the starting point of the installation and/or at the point of penetration of each building, and connects all the earth conductors, the main equipotential connection and the various protective conductors.

Caneco BT asks me to specify the total harmonic distortion rates, but my customer gives me no information on this type of pollution. What do I do?

In principle, there is no indication of the THD rates to apply to specific type of premises or buildings.
However, you can find this information in Engineers’ Techniques.

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Caneco BT

In principle, there is no indication of the THD rates to apply to specific type of premises or buildings.
However, you can find this information in Engineers’ Techniques.

Does Caneco BT allow for a maximum voltage drop on start-up?

Caneco BT allows for this maximum voltage drop on start-up in “motor” type circuits...

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Caneco BT

Caneco BT allows for this maximum voltage drop on start-up in “motor” type circuits.
Important: this value is only taken into account on the circuit concerned. In the case of an installation with a tree structure, the calculation will need to be made again.

What is the coefficient of use used for in Caneco BT?

The coefficient of use is generally used for the motors, so as to prevent motor fatigue.

The Ib current is calculated at full power; the working current is then 0.9xIb (circuit default configuration).

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Caneco BT

The coefficient of use is generally used for the motors, so as to prevent motor fatigue.

The Ib current is calculated at full power; the working current is then 0.9xIb (circuit default configuration).

The protective device offered by Caneco BT for my circuit is not suitable. How do I find another one?

By default, Caneco BT offers the protective device best suited according to the circuit data...

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Caneco BT

By default, Caneco BT offers the protective device best suited according to the circuit data.
If the choice isn’t suitable, you can select another protective device via the user choice. This change may entail modifications to the characteristics of your connection.

How do I let Caneco BT know whether a circuit is backed up or not?

There are several ways to indicate the type of circuit power supply. The simplest way is to go via the circuit card and indicate your choice in the power supply fields...

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Caneco BT

There are several ways to indicate the type of circuit power supply.
The simplest way is to go via the circuit card and indicate your choice in the power supply fields.

For a multiple entry, the Spreadsheet display method is the best suited as it enables information to be copied/pasted.

How do I make calculations for an LV installation in a country where the standard is not NF C 15-100?

Caneco BT currently manages 14 international standards, if you have the International Pack (formerly module P7) or the Caneco BT Full Version.

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Caneco BT

Caneco BT currently manages 14 international standards, if you have the International Pack (formerly module P7) or the Caneco BT Full Version.

Can I make calculations for a direct current LV installation with Caneco?

Direct current calculation is possible with Caneco BT if you have the Direct Current Pack (formerly module P13) or the Full Caneco BT Version...

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Caneco BT

Direct current calculation is possible with Caneco BT if you have the Direct Current Pack (formerly module P13) or the Full Caneco BT Version.
Make sure you chose a DC base to make calculations with the appropriate protection!