Receiving Helpdesk

what is the difference between zs and ze

by Fabian Hoppe Published 3 years ago Updated 3 years ago

Zs is the total impedance of the complete circuit and it is made up of:

  • The impedance of the supply cables and transformer windings, Ze
  • The resistance of our circuit line conductor, R1
  • The resistance of our circuit cpc, R2

Zs is the total impedance of the complete circuit and it is made up of: The impedance of the supply cables and transformer windings, Ze. The resistance of our circuit line conductor, R1. The resistance of our circuit cpc, R2.

Full Answer

What is the difference between zze and ZS?

ZE is the earth loop reading at the intake position (fusebox etc). ZS is the earth loop reading at the furthest point on a given circuit - example being the switch drop on a lighting circuit.

What does Ze and ZS mean in electrical wiring?

Country: Ze is the external earth fault loop impedence. Zs is the earth fault loop impedence at the furthest point on a final circuit. They are used to ensure that automatic disconnection will be achieved in the desired time in the event of an earth fault. 20 Jan 2012. #3.

What is ZS in simple words?

I'll try... in simple terms (i.e. igoring a few real-world difficulties).. Zs is the effective resistance of all the conductors between the source of enery and a phase-to-earth fault - i.e. the only thing that limits the current flow.

What is Ze pronouns?

The Brief: Ze, zir, and zem are variations of gender-neutral third person pronouns. Ze – pronounced “zee” –and its variations: zir, zem, and zeir, are gender-neutral pronouns that can be used to refer to people who are non-binary, genderfluid, genderqueer, trans, and/or don’t identify with the gender binary.

What is Zs and Ze?

– Zs is the earth fault loop impedance (Ω) – Ze is the measured value of external impedance (Ω), and. – (R1 + R2) is the measured value of resistance (Ω) for the line conductor and protective conductor, at the most distant point or accessory from the distribution board or consumer unit.

How do you calculate ZS from Ze?

0:121:52Total Earth Fault Loop Impedance Zs = Ze + R1 + R2 for TN-S and TN-CS ...YouTubeStart of suggested clipEnd of suggested clipFound by zs. In the total fault loop impedance equals ze the supply authorities cables impedanceMoreFound by zs. In the total fault loop impedance equals ze the supply authorities cables impedance added to r1 the lion conductors impedance. Added to our to the circuit protective conductors impedance.

What does Ze stand for electrical?

How to test External Earth Fault Loop Impedance (Ze)? `Ze` is a measurement of the external earth fault impedance of the installation. It is the measured resistance of the supply transformer winding, the supply phase conductor, and the erath return path of the supply.

What is the purpose of a ZS test?

An earth loop impedance test is conducted to make sure that, if a fault occurs in an electrical circuit, the fault current will strong be enough to set off the circuit protection. If a fault current is left undetected, circuits can overheat and catch on fire.

What is maximum permitted Zs?

Zs is maximum earth fault loop impedance to operate the fuse element of the disconnection device (overload and short circuit) in the required disconnection time. On TN systems the values in tables 41.2 and 41.3 will be relevant. In TT systems the earth fault loop is satisfied by the condition in 41.5.

What if Zs is too high?

If a Zs value is high, then you need to establish whether it is due to circuit conditions, supply conditions, or a fault. You can then descide the appropriate course of action. Just installing an RCD or RCBO may not be the solution in a deteriorating installation.

Is Zs at DB the same as Ze?

The board fed by the sub main will have a Zs value at the board which will roughly equal Ze = R1 +R2. You measure the Zs at the incomming terminals of the sub board. This is sometimes also called Zdb. At the end of the final circuits fed from this board will be a Zs for each circuit.

How do you test for Ze?

1:002:19External earth loop impedance (Ze) test - YouTubeYouTubeStart of suggested clipEnd of suggested clipI'll need to connect the crocodile clip to the disconnected earthing conductor and then just testMoreI'll need to connect the crocodile clip to the disconnected earthing conductor and then just test between one line incoming line to earth I've got a value there of 0.17.

What does Zs stand for?

AcronymDefinitionZSZellweger SyndromeZSZero ScaleZSZombie SquadZSZeptosecond (10 to the power -21 of a second)13 more rows

What is the 80% ZS rule?

The 80% rule of thumb is only intended to be applied to a test result taken from an impedance test. You have to ensure that the tested value does not exceed 80% of the tabulated value.

Can you calculate Zs?

Therefore, where reliable measured values are available for the external earth loop impedance (Ze) and for the loop resistance of the line and protective conductors (R₁ + R₂) of the circuit, it is permissible to derive the loop impedance of a circuit by using the following formula: Zs = Ze + (R₁ + R₂).

What is Zs in an electrical circuit?

What is Zs? Zs is the total impedance of the complete circuit and it is made up of: The impedance of the supply cables and transformer windings, Ze. The resistance of our circuit line conductor, R1. The resistance of our circuit cpc, R2.

kevinlondon

Just a quick question, but what does Ze and Zs mean in relation to earthing? Is it to do with calculations?

RF Lighting

They are used to ensure that automatic disconnection will be achieved in the desired time in the event of an earth fault.

kevinlondon

Thanks for your help, I was reading an electrical book today and couldn;t quite grasp it! Also L1 and and L2, what exactly are they? I leanred a bit at the earthign systems TT, TNS and TNCS

RF Lighting

Do you mean R1 and R2? These are used in relation to testing earthing on an installation.

kevinlondon

I'm trying to learn about electrics from a few books I have but some of it seems hard to grasp on my own. I can understand swtiching, lighting circuits, 2 and 3 way switching, ring ircuits etc but reading and learning about testing and inspections seems a bit tricky on my own!

ricicle

R1 = resistance of Line conductor from protective device to measured point on circuit.

DIYnot Local

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

What is Zs in electrical?

Zs is the effective resistance of all the conductors between the source of enery and a phase-to-earth fault - i.e. the only thing that limits the current flow. Ze is the bit outside of the installation (generally we don't care if the resistance is due to the phase conductor, the earth, or the transformer winding or whatever - just the total). ...

What is R1 and R2?

R1 and R2 are the resistances of the phase and earth conductors inside the installation. We usually think of them seperately because they can be different sizes and can measure them one at a time. Zs therefore = sum of Ze, R1 and R2.

Ze, Zir, Zem, Zeir

Ze – pronounced “zee” –and its variations: zir, zem, and zeir, are gender-neutral pronouns that can be used to refer to people who are non-binary, genderfluid, genderqueer, trans, and/or don’t identify with the gender binary. Other variations and tenses of these pronouns include zyrself and zirself.

More Gender-Neutral Pronouns

Ze/zir/zem/zeir are one set of gender-neutral pronouns.

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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9
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