electricalforum.nz

JamieP

I guess I just wasn't sure if there was any difference between the cable never being installed vs an alteration to one that was existing Was unsure if it had to meet current standards being installed for the first time whereas I thought ESR113 would apply if it had already been installed before but ...

JamieP

Customer has supplied old cable to use that is in good condition except that it has a plain green earth.

Can I use this is I sleeve or shrink the earth green/yellow at terminations?

JamieP

Understood, thanks Alec

JamieP

I was under the impression App A was for caravan parks etcetc

I am simply doing a supply to a shed and putting a single connection point

Agree though, allowing the full 16A seems to be the best option

JamieP

Appreciate the input and opinions, I agree, rather play it safe than not

JamieP

I am doing max demand calculations for a shed and there is to be a 16A socket outlet set up in accordance with 3001 but I'm just wondering what value I use for max demand? B ii and b iii don't explicitly apply Possibly M? But what can I assess? Or because the connectable is current limited by a 16A ...

JamieP

I'm not really sure to be honest. They aren't inside any zone but I guess they are directly associated with the hazardous area. Thanks Greg, I'm currently looking into this myself but just wanted to external opinions.

JamieP

My situation is I have been asked to install some equipotential bonds between pipes that carry explosive dust. The inside of the pipes is Z20. Outside the pipes is unzoned. The incoming pipe gets swapped between 2 different outgoing options via a flexible coupling so th the two equipotential bonds e...

JamieP

Oh yeah, I see the term Main Switchgear now Interesting It just got me thinking in regards to how today's rules can be applied to existing installation in regards to different terms used for things over the years, mainly in regards to people discussing things such as "main switch" heights on old swi...

JamieP

Thank you Alec

JamieP

Quite interesting that I've just had a look through but the term main switch only seem to have been a thing once 3000 arrived I can't find much in past Regulations but just curious if the term main switch was used in the industry prior to this or if people referred to the incoming isolation switch a...

JamieP

Does 2.9.2.2 (I) apply to domestic switchboards? I understand the exception "Exception: The requirements for doors of switchrooms and for emergency exit facilities need not apply to single domestic electrical installations." But it's a bit unclear which parts this does and doesn't cover to me. Altho...

JamieP

Thank you once again Alec, appreciated

JamieP

It was just the 63 (1) "All prescribed electrical work done on a low or extra-low voltage installation or part installation must be tested" (b) "to ensure that the installation or part installation is not electrically unsafe" Which was required as well as the other items in 63 (1) It just made me wo...

JamieP

Now, been covered before but hopefully someone can word things better for me in regards to this To put simply, I agree ESR24 has nothing to do with testing. ESR63 covers testing and we test as per 3000. Push button test or a specific device but the outcome is to ensure all poles disconnect. However ...

JamieP

I guess what's confused me a bit is 3.8.3.3 it seems to show the correlation between the colours which I understand but I couldn't see where it actually said these colors are acceptable but I'd missed 3.8.3.2 (b) which is where it allows flexible cords or cables to use the European colours for insta...

JamieP

I understand European colours are discussed in 3000 and it's common to have a black as L2 but is the use of European multiphase non-compliant as installation wiring due to table 3.4 only allowing colours other than those listed and this list includes black

Curious if I'm missing something or not

JamieP

Couldn't tell you sorry, I declined to connect and made them swap it out. I felt happiest this way but it just got me thinking where others draw the line with these things because as you say, I have heard of low readings disappeared once run and dried out or similar

Thanks for the input mate

JamieP

Cheers mate

I ended up getting and absolutely love my Weidmuller PZ6 ROTO LS

0.14-6mm singles and 0.14-4mm doubles

They use a trapezoid crimp

JamieP

4777 gets talked about a lot. We all know that 4777.1:2005 is cited, with 4777.1:2016 seemingly having much better information. Now I understand the whole best thing is to work to the most up to date guidance provided you don't contradict the cited version. I don't know 100% but let's just say that ...

JamieP

More directed that it seemed to want the switch to switch all actives locally, not to switch all actives remotely

But what you say makes sense, appreciated

JamieP

Oh what a dick I am, sorry, meant to quote 4.7.1, will fix this, sorry!

JamieP

Neither arrangement does

But neither arrangement has too because a device for isolation is not required. Only a switch.

Unless you're referring to the contactor at the switchboard? That will still have a protective device upstream of it.

JamieP

"shall be provided with a switch, operating in all active conductors, mounted near the appliance in a visible and readily accessible position." Reading this the switch that is mounted near the appliance in a visible and readily accessable position must operate in all active conductors but a local co...

JamieP

Of course. My question was more around compliance of my wiring but I guess as you've indicated above unless I can prove it meets the requirements of today's rules to be suitable for my additional cables then I shouldn't be using it because I can't garentee it complies so my options are either prove ...

JamieP

Further question: Situations where there are existing ducts/conduits with existing cables Would this be the same case that to run additional cables in them we would have to ensure they were up to current standards so our cables can be certified as compliant? Or could we treat it like a complied when...

JamieP

Quite frequently the installation of ducts and conduits underground is outsourced with no way to know if it's been done correctly unless being there at the time or digging it up to check. I'm just curious if it would be PEW or require a license/registration to do so? Should a CoC be issued? In most ...

JamieP

I believe this has come up a few times and Alec said that the pictures were incorrect. I believe it's like the usual string theory he mentions and should be rounded like you've indicated. 6.2.2.2 the actual clause that gives the measurements rather than the informative pictures to me indicates a 150...

JamieP

So in terms of compliance, to put responsibility off me and back to them, either need a EWoF if classed as a transportable but if not transportable they need to supply me with a CoC being part of the installation?

JamieP

I have been supplied a bunch of buildings that are essentially transportable installation. However the buildings have shown up with a mains entry box. I believe they are changing them from a plug in connection to get around the technicality of being a trainsportable by making them direct connected. ...

JamieP

I'd say yes, the point is that the limiting factor is based on volt drop considerations not CCC so I don't know how that would be any different

JamieP

This wouldn't be within the scope of 3760 though, would it?

Or are you just applying that as a closest available guide to this situation

JamieP

Asked to connect a motor. This was a used motor so I checked the winding resistances, insulation resistance between windings and IR from windings to frame. My IRs were around 0.5M through to around 2.5M at the highest. I decided I wasn't happy to connect. My question is was this a fair judgement? I ...

JamieP

Thanks Alec, great points to consider

JamieP

But the definition in 4509 indicates the conductors supplying the main switchboard. Where as supplying a single load I don't have a main switchboard.

JamieP

We have a proposed installation of a remote generator, supplying a VFD and then to a pump motor. I believe the generator will need an earth electrode and MEC and have looked to 4509.1 for information. With having no mains I'm struggling to understand what we size the MEC to. My only logic seems to s...

JamieP

Thanks Alec, very helpful as always

JamieP

Yeah totally man, and I definitely understand the legal vs real world thing but it's just something that got me thinking and curious around others thought around what the words actually say and technically require rather than what is actually practical to achieve etcetc

JamieP

I understand an ESC is completed for all work when connection is completed but I'm just curious on views on how much this makes us responsible for in some cases Disconnection and reconnecting an appliance or fitting is usually easy being on the end of the supply but I'm curious about situations such...

JamieP

My main purpose for the question above is if the limitation of 3 FSCs per RCD would apply and I understand in most cases it would never be an issue due to CIs usually being fairly small in nature but just curious from a technical point of view Also the requirements of a minimum of two RCDs, in a non...

JamieP

Further question, is a CI considered a residential installation? I would assume not unless it was a sleepout or something designed for such purpose and if it's not, like simply an office, 2.6.2.4 (b) wouldn't apply? Because 2.6.2.4 (b) applies only to "in a residential installation" Obviously the ab...

JamieP

Is the CI considered its own installation? Otherwise could you consider upstream RCDs in the installation to contribute towards the minimum of two per installation when 2 or more FSCs?

JamieP

Thanks Alec, very in depth read And I think you can also probably conclude that regardless of trying to get around it, it's quite clear that the green/yellow is only intended to be used as an earth in many situations, this situation feels like one when you know it probably shouldn't be but you are t...

JamieP

Now this one seems to get a little complex and just based on previous comments and opinion I think it'll probably be a situational basis Although probably not "good practice" (hate the term) would it be ok to use the earth core within a multicore control cable as a control core if needed? I suppose ...

JamieP

Thank you, I was just thinking in terms of them being parallel and keeping each parallel pair together to keep them as close as possible in length

But thanks team, will look into it

JamieP

I have 300mm² parallel conductors that I need to split across two ducts Just confirming there is no issue with this and what the best solution/split is? Haven't dealt with this so curious of information and references My thoughts are 2 phases in one and 1 phase + Ns in the other and believe this to ...

JamieP

I suppose as you say "connection to an external power supply that operates at a nominal voltage between 90 and 250 volts AC at standard low voltage" external power that opperates at 90-250 at SLV SLV "in respect of electricity supplied by either a single-phase MEN system or a multiple-phase MEN syst...

JamieP

Thanks Alec, appreciate it

JamieP

Apologies Alec, just had a re look over this and just to be 100% clear because it hasn't been definitely mentioned but it was ESR7 and the fact it says "connection to an external power supply that operates at a nominal voltage between 90 and 250 volts AC at standard low voltage" Incase that changes ...

JamieP

Ah, right, how do we know it's voltage to earth? Is that to do with the definition of standard low voltage? 230V P-N?

Search found 478 matches