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  1. J

    solar max mt 10

    Hi all, I've got a problem with a 20kw system in Hertfordshire. System is split into 4 strings over 2 10kw inverters. 1 inverter is showing DC insulation fault, I have had a look at the manual which says - the insulation resistance of the Pv generator against earth is too low. It then goes to...
  2. B

    max zs with rcbos and rcd spurs

    Hi Everyone I was just wondering if anyone knew more about maximum zs readingsa for rcbos if say you have 1. a type C 16AMP bs 61009 rcbo 30ma is the maximum zs 0.92ohm OR IS IT 1667ohm 2. if the circuit came straight from db ran to an rcd spur 30ma protected by a bs 60898 B 16 amp mcb which...
  3. D

    Max demand and diversity

    Looking for some assistance here, been asked to calculate the max demand and diversity for the supply authority who are installing new main armour to a domestic building which I am rewiring. When calculating the max demand do I use current rating of the circuit breakers for the individual...
  4. G

    Micc cable max load

    Hi all can anyone help I'm working on a 3 bed bungalow the incoming supply is pme'd in a garage over 30 meters away from the property and the ccu is in the house which is being fed by a 4 mm micc/pyro from the garage. What is the max load for this type cable thanks mike
  5. S

    solar max inverters

    Been recommended a solar max inverter for a 5kw installation, does anyone have any experience of solar max/horror stories or are they sound?
  6. A

    9kw electric Boiler and max demand

    Sorry to bring this up, I've searched through some of the old stuff, but would like a bit of reassurance... Been asked to install a 9KW electric boiler with immersion circuit for the cylinder. I couldn't see the main cut out as it was beleive to be in a different flat, so of course I will need...
  7. P

    0.05 Max Impedance for Main Bonding Conductor

    Got massively ribbed on another post for not knowing that max impedance for a main bonding conductor is 0.05 ohms, so I expect some more for this post!....... I'm going to assume there is a very simple answer for this, but despite me going blind reading GN8 I can't for the life of me work out...
  8. B

    max main bond length

    Hello people Doing cu change , TNCS, upgrading bonding , the gas is other side of house , cu in double garage had to take cable up into bedroom above in trunking and then across loft down external wall i conduit into gas meter box and bond there. When measured route it came to abouty 25m but...
  9. Z

    Max Zs value for TT distribution circuit (NOT Final circuit!)

    Apologies if this question sounds a bit basic but am a little confused at the mo and quite new to the game. Here goes - I am trying to complete a NICEIC Highway Installation Certificate for a system where there is a 230 v TT supply coming into a roadside pillar into the main BS88 fused head...
  10. mwigham85

    Crabtree C50 max zs

    I recently asked what the max zs would be for a Crabtree C50 7.5a breaker and didn't find the answer but if any one else ever needs to know here's a formula take the breaker rating 5,7.5,10 etc multiply by ( 4 for type1) (7 for type 2) and (10 for type 3) then divide 230v by that value...
  11. S

    Max Measured Zs

    Hi All On the test cert I have it asks for max "Measured" Zs. With my megger 1552 I can do this at socket outlets using the no trip loop test and the plug lead. On a radial circuit what lead combo do I need to use? I'm guessing its a 3 lead test on L N E at the furthest point of the circuit...
  12. J

    Max demand problem

    First post - be gentle. Just changed a consumer unit and am struggling with the "max demand" bit on the paperwork. RCD is 100A, Main fuse is 100A, it has 2 showers (50 A each) no diversity allowed on showers. so, um, not much room for anything else. .....or am I being a moron? Thanks Jim
  13. H

    Max Demand

    Hi all just got quick question 60 A Main service fuse total house rewire worked out tat Max demand using x 0.4 will be 64.8 A just wondering if it might be worth giving DNO a ring to see if its possible to upgrade to 80 A main fuse is it worth ringing?
  14. Mark.W

    Max output current of inverter

    Hi guys Can someone pls tell me if the max output current (iacmax) on an inverter data sheet is the max output current per inverter or per phase! Thanks Mark
  15. C

    Max Zs exceeded from generator

    Hypothetical situation, power supplied from a generator - So a temporary installation. BS 61009 Type C 100mA RCBO – 32A fitted at generator Cable run is approx. 300m, in 4mm HO7 Rubber PVC flexible cable ran outdoors, terminated in a 32A socket (single phase) Ze = 0.03 ohm Maximum Zs is 0.72...
  16. S

    Max demand on a unit

    Guys, I have been asked to calculate the maximum demand for a DNO who want the information before upgrading the metering to 3 phase. The client has 3 phase coming in to the building but only single phase meter. The building is a small commercial warehouse unit (4m x 6M) with some upstairs and...
  17. R

    Max allowed on 60amp incomer

    My cleint has a small holiday lodge and wanting to remove hot water cylinder and night storage heaters and replace with instanious water heater and panel heaters. As he is only in lodge a day here and there. The plan is to replace old fuse box with new 17th ed consumer unit. Which will include a...
  18. F

    Max wind speed on roof?

    Hey guys can anyone clarify for me the safe working wind speeds for working on roof? All i can find is 17mph but this is for roofers and scaffolders and not specific to PV. Anyone? Thanks in advance :tt1: Fiardor
  19. L

    Tail sizes - max demand suggests too small

    Fellas Im just writing up the 5 flats I inspected last week, all the service heads/fuses are new to within 3 years, the cut out fuses are all 100A and tails all 16mm, I know discretion is sometimes needed in this area, on some flats the Max demand reaches 90-100A whilst in others 65-75A, would...
  20. R

    Max conductor size

    Hey all, anyone know the max conductor size for an mcb?
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