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  1. P

    Max Zs values at different ambient test temperatures

    Hi guys, I'm currently revising for my 2391 and kind of confused on the temperature factors for the Zs values The BBB give Max Zs which are 100% values with a max operating temperature of 70c. The OSG and GN3 give values to 80% which are when tested at ambient temp of 10c according to page 146...
  2. J

    Max zs mccbs/ACB TNS/TT Systems

    Hi might be a stupid question but somone might have the answers. TNS systems and TT where the Ze of the installation is a lot higher than a Ze <0.35 of a TNCS system, how do you comply max Zs of a MCCB in a panel board disconnection time of 5s? Most data manufacturers instruction give really...
  3. D

    Wallbox pulsar max Install

    Hi I’m installing a wallbox pulsar max in a few weeks and they don’t come with a CT is it even allowed to fit a EVCP without a CT clamp? Thanks
  4. cliffed

    Max Zs measurement allowed

    Any ideas on the Max Zs on a 3871 Type 3 13 amp MCB
  5. MaintenanceSpark

    Max Zs for Bill Talisman MCCB

    Hi everyone, Happy Friday! Could someone please point me in the right direction, I’m after the Max Zs for a Bill Talisman TLF633 63A MCCB, I’ve looked in the BBB but to no avail on the Max Zs tables. I’ve also looked on our Cert software as they have a Max Zs app but the MCCB category doesn’t...
  6. MaintenanceSpark

    Max Zs Bill Talisman MCCB

    Hi everyone, Happy Friday! Could someone please point me in the right direction, I’m after the Max Zs for a Bill Talisman TLF633 63A MCCB, I’ve looked in the BBB but to no avail on the Max Zs tables. I’ve also looked on our Cert software as they have a Max Zs app but the MCCB category doesn’t...
  7. T

    max output from US 5000 pylontech batteries

    Good morning all. Before I start I am not an electrician and am relatively new to this topic. Current set up Axpert 5.5 Kw inverter, 7 x 420 watt panels in series and 2 x US 5000 Pylontech batteries paired (1 master 1 slave). System working fine will no issues. I know this may have a simple...
  8. Q

    Max ZS - Help reading curves

    Hi All, As ever another question regarding Max ZS! I just need help reading these curves and getting my head around them. Data sheets confuse me and overload me with information. So I have a Terasaki S800-NE MCCB Here is the Datasheet...
  9. M

    Max zs for a 60269-2 16A fuse?

    Says it all in the title really. Thank you in advance!
  10. M

    help with max zs values please

    hello , can anyone reccomend a free download for max zs values for bs 3871 ct breakers please
  11. Gaz92552

    Max Zs value for AFDD

    Does anyone know where I can find the maximum Zs values for AFDD's? Table 41.3 refers to 60898 and 61009-1 but AFDD's are BS 62606
  12. C

    18th edition max zs readings

    Hi can anyone point me in the right direction I’m looking for a copy of the max zs tables for fuses/mcbs etc from 18th Ed. I’m awaiting my regs book to arrive and need to swat up, has anyone got a link I can print out thanks
  13. R

    Fox H1 max open circuit voltage,?

    I have 18 panels in 2 strings (37.8v open circuit voltage each) to be connected to a Fox H1 inverter. The manual says the below. Is the 600v open circuit voltage per string or for both strings combined? H1 series inverters can be connected with 2-strings of PV modules. Please select suitable PV...
  14. T

    10/3 120ft. Black and red On 1 breaker to keep amps up. What is the max breaker for that?

    10/3 120ft. Going to an out building. Black and red On 1 breaker to keep amps up. What is the max breaker for that setup?
  15. R

    Max length of cable runs.

    Hi I'm looking at Table 7.1(i) in the On Site Guide. Max length of cable runs. In some cases where there is no RCD protection the length is given as a number with a zs suffix. eg 47zs The zs suffix means "limitted by Zs" the final circuit line-earth loop impedence. In these cases is the...
  16. Phil L

    Max car chargers in domestic

    What’s the maximum number of EV chargers a domestic house can have?
  17. gmdaly

    meaning of 'design' value for max Zs?

    Hi all, I have an assessment exam question that asks for the design value for a 32A 60898 MCB max Zs. By 'design' value is this the regs tabulated value (working temp) or the lower value 80% for testing in ambient?. With no other information the word design is throwing me as it seems like it...
  18. Frimley111R

    Commercial Max Demand Course?

    I've seen some companies doing max demand calculations/reports on commercial properties and this would be useful for us to do. However we don't have anyone who is skilled/knows enough to do this. Although our team is very experienced this seems like a niche we don't have experience in. However I...
  19. S

    Max Zs Coding Question 80/100%

    Hi new member here looking for a bit of advice. I recently undertook a condition report of a building where the measured Zs at the distribution boards (board Zs) were above 80% of the max Zs value of the MCCBs in the panel board supplying them. In some cases it’s also above the 100% value. I’m...
  20. O

    UK Max zs Values in the on-suite guide

    Hi all, Just wondering if anyone can shed some light on the max zs values in the OSG, they don’t seem to follow the 1.25 divisor stated in the note on page 126 For example BS 60898 circuit breaker, max zs at 70 degrees is 7.28, following the formula this should be 5.82 at 10 degrees which is...

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