What Is the Standard Turn-Off Time for RCD Switches? Does 0.2/0.4/5 Sec Rule Apply?

Question

Hello. What is the required turn-off time for an RCD switch according to the standard? Does the 0.2/0.4/5 sec rule also apply in the case of RCDs? I know that the switch-off time depends on the fault current that will flow through the RCD, but I want to determine the efficiency of the switch...

.Jack · Accepted Answer

The operating time depends mainly on the switch and not on any residual current - (what is this residual current?). And the activation time depends on the multiplicity of the residual current. For a multiple of one, for a standard RCD, it is 0.3 s, for a multiple of two, it is 0.15 s, for a multiple of five, it is 0.04 s. The latest standard for checking electrical installations in Poland does not provide for checking and documenting the operation time of the residual current circuit breaker, so it can be omitted in the protocol. A measuring electrician should know this.

elpapiotr · Accepted Answer

The reference point is in section 411.3.2.2 of the PN-HD 60364-4-41 standard of November 2009

elpapiotr · Answer

You have to add it though, my friend .Jack , when it is recommended to check the required shutdown times.

voytalo · Answer

Residual current is one of the terms for residual current - an electrician should know about it.
I`m not a measuring electrician, but I deal with measurement protocols in which I encounter a record of the RCD activation time, that`s why I`m asking.

Added after 2 [minutes]:

elpapiotr wrote:
You have to add it though, my friend .Jack , when it is recommended to check the required shutdown times.

I know that this time should be checked in the case of a second-hand RCD test. But what good is measuring time if I have no reference point? Hence my question about the requirements.

voytalo · Answer

Unfortunately, I don`t have access to the PN, so if you could cite this entry, I would be grateful.

.Jack · Answer

It is not the fault current, but the standard specifies: residual fault current. Anyway, never mind. In my opinion, this is an incorrect spelling or poorly translated from English. But you know what I mean. This point contains a table: Maximum switch-off times for final circuits with a current not exceeding 32 A.

elpapiotr · Answer

Alright.
You do not need to have access to the relevant PN to determine the effectiveness of protection by ensuring SWZ for protection devices, including RCDs, for specific (and permissible) activation times.
This is the basis for environmental conditions, etc.
You definitely have this data, and if not, calculate it.

voytalo · Answer

After all, in the first post I asked whether SWZ is used to ensure the required switch activation times of 0.2/0.4/5 s. It should have been written right away that the required shutdown time for RCDs is the same Anyway, thanks for clarifying the situation

elpapiotr · Answer

You have the required RCD switch-off time:

Anonymous · Answer

According to the PN-HD standard, you only check PE continuity. Without any measurements. Cool protocol: RCD FAEL type, regular type Exceptional precision.

elpapiotr · Answer

For terminology, blame Sonel, not the measuring person, bro Bronek:

What Is the Standard Turn-Off Time for RCD Switches? Does 0.2/0.4/5 Sec Rule Apply?

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