max

Recent contents Top users
  1. J

    UK High Max Zs

    Undertaking an EICR and there was a high measured Zs on the B30 MCB Ring Main circuit (TN-C-S) - No RCD protection on any circuit. Lighting circuit for building extension is spurred off ring main, max R1+R2 recorded was 1.84 (Zs 80% = ~1.17). As I understand it, though not ideal, the remedial...
  2. 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...
  3. J

    UK Max distance cable can run overhead without support

    Hi folks, I have been through the regs. Have a garage wired from a house. Cable runs overhead at an appropriate height and is suitable cable. The distance in mid air is about 2m. My question is does this need mechanical support by way of a conduit or tray. It does seem a bit excessive for that...
  4. S

    How much surge in voltage should be in the surge protector? (Min and Max range)

    Hello, I live in the Middle East. I have between 220V to 230V. I bought surge protectors for AC and other appliances such as PC and TV. The upper limit voltage in surge protectors is 255V and the lower is 170V. How does the manufacturer calculate the normal voltage? (for my surge protector is...
  5. 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...
  6. 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
  7. cliffed

    Max Zs measurement allowed

    Any ideas on the Max Zs on a 3871 Type 3 13 amp MCB
  8. 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...
  9. 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...
  10. D

    AC Service Panel Max Solar Backfeed

    Hi, I plan to add solar to my home and have a question about how many amps I can backfeed into my AC service panel using Net Metering. I know NEC 705.12 (D) (3) limits this to 120% of the service panel busbar capacity minus the main circuit breaker rating. I have an old GE panel from the ‘70s...
  11. M

    Max zs for a 60269-2 16A fuse?

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

    help with max zs values please

    hello , can anyone reccomend a free download for max zs values for bs 3871 ct breakers please
  13. 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
  14. T

    TP 100amp submain on BS88-2 fuses, but the Zs is above the Max allowed...

    I am helping a local football club who are having some issues with Zs being too high on the submain. They have the supply Henley blocked into a 100amp TP switch fuse (BS88-2) which then feeds a 35mm 4 core SWA 95m to an isolator in another building which is being built. The Ze at the incomer...
  15. 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
  16. 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...
  17. 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?
  18. 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...
  19. Phil L

    Max car chargers in domestic

    What’s the maximum number of EV chargers a domestic house can have?
  20. 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...
Best EV Chargers 2025
Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Daily, weekly or monthly email

Receive a daily, weekly, or monthly email containing a digest of new and recently updated threads.

Advert

TrueNAS JBOD Storage Server

UK Tiling Forum | Tilers Forums
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Electrician Tips from Professional Electricians
JBOD Forums: a forum for JBOD storage server advice
JBOD Suppliers: JBOD Storage Server Supplies
Back
Top