Search found 48 matches

by pluto
Fri Mar 03, 2023 5:33 pm
Forum: Selection and Installation of Wiring Systems
Topic: Earthing of aluminum ladder
Replies: 6
Views: 6464

Re: Earthing of aluminum ladder

And don't forget the galvo High tensile steel bolts and the belview washers + sealing paste for a good AL to AL joint.
by pluto
Tue Jan 10, 2023 9:07 am
Forum: Transportable Installations
Topic: Inverter in connectable installation
Replies: 12
Views: 7359

Re: Inverter in connectable installation

I would use "comply with the safety requirements of AS/NZS 4763" due to wide range of inverters available form all parts of the world. Even in Aust. there are very few manufacturers who claim direct compliance with AS/NZS 4763.
by pluto
Tue Apr 12, 2022 10:16 am
Forum: General Electrical Discussions
Topic: Auto Transformer Neutral
Replies: 8
Views: 5662

Re: Auto Transformer Neutral

Connecting a "STAR connected" primary winding to a MEN supply can caused high currents in the incoming neutral connections and is generaly not recommended. The cause of the high cureents being harmonic currents, in particular the 3rd and 5th harmonics. It is likely to be more of a problem if the rst...
by pluto
Tue Mar 15, 2022 5:02 pm
Forum: Transportable Installations
Topic: Imported US boat
Replies: 5
Views: 3662

Re: Imported US boat

The arrangement described in very unlikely to comply with AS/NZS 3004 series. Not enough detail given to be specific.
by pluto
Wed Jan 12, 2022 8:33 am
Forum: Appliances
Topic: 220V and 380V electrical equipment
Replies: 6
Views: 5069

Re: 220V and 380V electrical equipment

The problem now is the appliance series of standards as/nzs 60335 allows for a +/- 10 % window ( 253 V to 207 V) for the nominal 230 V supply so the max voltage range has now become much wider. Remember most supply companies usually use 240 V is the target so that at max loading periods they are sti...
by pluto
Wed Jan 05, 2022 8:49 am
Forum: Selection and Installation of Wiring Systems
Topic: Neutral Screen Cable
Replies: 8
Views: 7352

Re: Neutral Screen Cable

I have a feeling that the neutral or earth must be the only connections to the screen was transfered to the Standard AS/NZS 4961, I don't have a copy to check, but the following statement from a well konow cable manufacturer clearly indicates the requirment. I quote Service entrance or consumer main...
by pluto
Tue Jan 04, 2022 9:21 am
Forum: Selection and Installation of Wiring Systems
Topic: Neutral Screen Cable
Replies: 8
Views: 7352

Re: Neutral Screen Cable

Prehaps I am showing my age in the electrical industry, but in the Electrical Wiring Regulations 1961 R82 (6) there was a mandated requirement that the screen of Neutral screen cable can only be used as a neutral conductor or Earth conductor. Since that date (1961) i don't recall any changes made in...
by pluto
Sat Jan 01, 2022 9:57 am
Forum: Standards and Legislation
Topic: Means of Compliance 1.9.1
Replies: 2
Views: 2713

Re: Means of Compliance 1.9.1

AS/NZS 3000 is NOT the main document for complaince in NZ it is the Electricity (Safety) Regulations 2010 +amendments is the document to which all electrical work is certified. AS/NZS 3000 just happens to be one of the ways of complying.
by pluto
Thu Sep 02, 2021 7:40 am
Forum: General Electrical Discussions
Topic: Auto Transformer Neutral
Replies: 8
Views: 5662

Re: Auto Transformer Neutral

Read NZS 6114 A standard dealing with no-standard supply voltages and give guidance.
by pluto
Sat Aug 28, 2021 1:30 pm
Forum: Selection and Installation of Wiring Systems
Topic: Ring circuits - Are they a complaint method?
Replies: 2
Views: 2066

Re: Ring circuits - Are they a complaint method?

They need the two final subcircuit tails at the switchboard position for active to be in the same MCB terminal and the same terminal on the neutral AND earth bus bars for the neutral and earth connections. I would not recommend the provision inn the United Kingdom Wring Rules BS 7671 of using a high...
by pluto
Sun Jun 27, 2021 1:00 pm
Forum: Generators and Solar
Topic: Single phase generator on a 3 phase installation
Replies: 6
Views: 5829

Re: Single phase generator on a 3 phase installation

For the as/nzs 3010 revision and as/nzs 3000 revision of section 7.3; an number of very important point must be made. What as/nzs 3000 needs to do is to consider and cover systems of supply in some depth, in particular what is the TN-C-S (the so called MEN system) system of supply is and how it appl...
by pluto
Thu Jun 03, 2021 9:46 am
Forum: Transportable Installations
Topic: Shore power connector & inlet
Replies: 12
Views: 6755

Re: Shore power connector & inlet

I would suggest you read AS/NZS 3004.2:2008 clauses 5.5.5 , 5.5.6 and 5.5.7 carefully when carrying out testing of the earthing conenctions required. The clause required to be used depends on the location of the isolating transformer (on the marina, or on board), if none, you use clause 5.5.7. Appen...
by pluto
Wed Apr 28, 2021 7:26 am
Forum: Transportable Installations
Topic: Shore power connector & inlet
Replies: 12
Views: 6755

Re: Shore power connector & inlet

An isolating transformer with a screen between the primary and secondary windings provides for the return of an earth fault tfrom the primary winding to the screen to return to the supply source and nowhere else, but needs the inlet plug to be insulated from the boat metallic parts earthed by the eq...
by pluto
Tue Apr 27, 2021 8:50 pm
Forum: Transportable Installations
Topic: Shore power connector & inlet
Replies: 12
Views: 6755

Re: Shore power connector & inlet

Would suggest that you carefully read as/nzs 3004.2:2008 clause 5.5.6 3rd and 4th paragraphs, if says the opposite to what you claim.
by pluto
Mon Apr 26, 2021 1:00 pm
Forum: Transportable Installations
Topic: Shore power connector & inlet
Replies: 12
Views: 6755

Re: Shore power connector & inlet

Alec K I have for many years worked for an organization that sourced equipment from all parts of the world. In some cases, it was the only country that made the equipment, so one had to adapt this equipment initially designed for other supply systems to operate in an electrically safe manner on the ...
by pluto
Sun Mar 14, 2021 9:19 am
Forum: Transportable Installations
Topic: Mobile Medical 6115
Replies: 12
Views: 5648

Re: Mobile Medical 6115

Some other background. There was considerable common sense applied by the team of nine committe memebrs in the preperation of this standard in 2006. There was no IEC, BE, EN, or UL standard to follow for the MMU and we started from a blank sheet of paper, and developed this standard in a very short ...
by pluto
Sat Mar 13, 2021 8:54 pm
Forum: Transportable Installations
Topic: Mobile Medical 6115
Replies: 12
Views: 5648

Re: Mobile Medical 6115

Pluto Would suggest that you read the whole of the standard and stop “cherry picking” clauses and get the full extent of the requirements. Part AK quote So you have specified what kind of system can be fitted into the pillar / lead. Yet the Fig shows a system that's more correctly described as being...
by pluto
Fri Mar 12, 2021 8:34 am
Forum: Transportable Installations
Topic: Mobile Medical 6115
Replies: 12
Views: 5648

Re: Mobile Medical 6115

AlecK I wish to correct a post you made in a statement which is incorrect. I quote from your post However facts are that 1 there is nothing in the Standard that makes that superior system mandatory; and 2 the simple system fully complies with the requirement stated in the clause. If that's not what ...
by pluto
Wed Mar 10, 2021 2:40 pm
Forum: Transportable Installations
Topic: Mobile Medical 6115
Replies: 12
Views: 5648

Re: Mobile Medical 6115

The simple circuit earth monitoring unit from the 1976 handbook is not good enough. The existance of a diode as part of the sensing circuit should tell you that the clever box required has some more checks and balances built into the continuous monitoring circuit. From memory the monitoring circuit ...
by pluto
Wed Mar 10, 2021 9:15 am
Forum: Transportable Installations
Topic: Mobile Medical 6115
Replies: 12
Views: 5648

Re: Mobile Medical 6115

Bender is one supplier of the device required by NZS 6115.

There is a NZ agent and thay have supplied monitoring devices for existing Mobile medical installations.
by pluto
Wed Mar 10, 2021 8:53 am
Forum: Earthing and Bonding
Topic: PELV Earthing
Replies: 7
Views: 5261

Re: PELV Earthing

The fundamental reason for the use of Extra Low Voltage (ELV) needs to be considered first and AS/NZS 3000:2007 clause 1.5.7 (a) and (b) gives details of the basic requirements. The next consideration is the electric shock protection of the ELV circuit, there are two options, Safety Extra Low Voltag...
by pluto
Tue Mar 02, 2021 1:50 pm
Forum: Earthing and Bonding
Topic: Steel bench top.
Replies: 14
Views: 9100

Re: Steel bench top.

Unfortunely, the document from ECANZ FAQ: Q12012_Bonding-of-sinks-and-exposed-metal-work is NOT fully correct. The key words “equipotential bonding” and the large contribution it makes to the electrical safety in the specified conditions, when multiple metallic water supply pipes, taps and drain met...
by pluto
Sun Feb 28, 2021 8:31 am
Forum: Transportable Installations
Topic: WoEF - No Overload Protection in Caravan
Replies: 13
Views: 5521

Re: WoEF - No Overload Protection in Caravan

Further to the above message The application of AS/NZS 3000 series standards does not include the appliance series of standards which cover multi-boxes (EPODs etc) and double adapters the following applies; greater than 3 socket outlet an overcurrent protection device rating can not exceed the max r...
by pluto
Sat Feb 27, 2021 7:52 pm
Forum: Transportable Installations
Topic: WoEF - No Overload Protection in Caravan
Replies: 13
Views: 5521

Re: WoEF - No Overload Protection in Caravan

Be aware that AS/NZS 3000 only covers INSTALLATION wiring it does NOT cover appliances or other similar type loads temporarly plugged into socket outlets of a connectable installation.

That was the reasoning used when I help drafting of ECP 1 in 1992, and it has not changed since then.
by pluto
Sat Feb 27, 2021 5:32 pm
Forum: Transportable Installations
Topic: WoEF - No Overload Protection in Caravan
Replies: 13
Views: 5521

Re: WoEF - No Overload Protection in Caravan

Note it was NOT by AlecK but by PLUTO!
by pluto
Sat Feb 27, 2021 2:43 pm
Forum: Transportable Installations
Topic: WoEF - No Overload Protection in Caravan
Replies: 13
Views: 5521

Re: WoEF - No Overload Protection in Caravan

The connectable installation details in this blog demonstrate that clarification on the configuration and overcurrent protection requirements for standard and simple connectable installations is required. Remember that provisions for "connectable installations" have existed in the Electrical Wiring ...
by pluto
Fri Feb 26, 2021 7:43 am
Forum: Selection and Installation of Wiring Systems
Topic: Overhead Submain Cabling
Replies: 17
Views: 7590

Re: Overhead Submain Cabling

But AS/NZS 3000:2007 clause 3.12.4 calls Table 3.9.
by pluto
Thu Feb 25, 2021 1:21 pm
Forum: Selection and Installation of Wiring Systems
Topic: Overhead Submain Cabling
Replies: 17
Views: 7590

Re: Overhead Submain Cabling

The following statement is incorrect I quote pluto also observed that for a long run aerial wiring should be hard drawn conductor rather than the normal type. True it should be, but it's not actually a requirement of "3000". Quote ends AS/NZS 3000:2007 table 3.9 details the hard drawn cable requirem...
by pluto
Fri Feb 19, 2021 4:16 pm
Forum: Standards and Legislation
Topic: Are DC + and - considered as "Active"s in 3000
Replies: 6
Views: 3092

Re: Are DC + and - considered as "Active"s in 3000

In the IEC the colour code for installation cables have a differerent colour alocated for AC and DC cables. There is no common colour code for AC and DC cables, live or otherwise.
by pluto
Thu Feb 04, 2021 8:48 pm
Forum: Selection and Installation of Wiring Systems
Topic: Overhead Submain Cabling
Replies: 17
Views: 7590

Re: Overhead Submain Cabling

It depends on the span lenght, use PVC conduit if the span is short, or a run of 4x 2 timber. Use 2 + E TPS or 2 core + N/S. If a long span use 2 core + N/S, you have to use larger CSA cable and hard drawn cable for a long run.

Use of the outbuilding provisions for earthing not recommended.
by pluto
Mon Jan 04, 2021 9:38 pm
Forum: General Electrical Discussions
Topic: History of 3000
Replies: 6
Views: 5418

Re: History of 3000

The standards you quote are a amall part of applicable Electrical Wiring Regulations, Codes of Practice and Standards used for electrical installations over the years and many have never been altered since the original installation took place and was inspected. the fill list is Electrical Wiring Reg...
by pluto
Mon Jan 04, 2021 9:12 pm
Forum: Protective Devices
Topic: Redundant Isolation Switch in combination boards (meter + MSB)
Replies: 2
Views: 3629

Re: Redundant Isolation Switch in combination boards (meter + MSB)

What ie required is NOT detailed in as/nzs 3000 it is the agreement between the metering provider and the electricity retailer. as/nzs 3000 excludes revenue metering installation. I agree that main switch when operated should remove supply from nearly all of the electrical installation. Most approve...
by pluto
Thu Nov 05, 2020 8:20 am
Forum: Generators and Solar
Topic: Solar Earth Value
Replies: 9
Views: 5872

Re: Solar Earth Value

Lightning protection is another factor that needs consideration
by pluto
Thu Nov 05, 2020 8:19 am
Forum: Generators and Solar
Topic: Solar Earth Value
Replies: 9
Views: 5872

Re: Solar Earth Value

Lightning protection is another factor that needs consideration
by pluto
Tue Oct 27, 2020 11:47 am
Forum: Generators and Solar
Topic: Batteries - How to know whether to apply 3011.1 or 3011.2
Replies: 3
Views: 3358

Re: Batteries - How to know whether to apply 3011.1 or 3011.2

AS/NZS 3011 is for lead acid batteries only so they do not apply.
by pluto
Tue Oct 27, 2020 7:30 am
Forum: Generators and Solar
Topic: Batteries - How to know whether to apply 3011.1 or 3011.2
Replies: 3
Views: 3358

Re: Batteries - How to know whether to apply 3011.1 or 3011.2

The battery chemistry is a " lithium-ion storage battery" which means AS/NZS 5139 is the correct standard to use, but the battery makers instructions must be used. A battery maintence system (BMS) is also essential too and needs to used and adjusted to the correct operating voltage for maximum servi...
by pluto
Mon Oct 19, 2020 1:22 pm
Forum: Generators and Solar
Topic: Lockable main switch at switchboard connection - 4777.1 2005
Replies: 7
Views: 4688

Re: Lockable main switch at switchboard connection - 4777.1 2005

I would not consider that the existing main isolating switch mounted on the main switchboard in the mains incoming supply supply would need to be changed to make it a lockable isolating switch. The main reason for a lockable switch on the grid connect inverter supply is to enable if back feeding int...
by pluto
Mon Oct 19, 2020 11:44 am
Forum: Generators and Solar
Topic: Lockable main switch at switchboard connection - 4777.1 2005
Replies: 7
Views: 4688

Re: Lockable main switch at switchboard connection - 4777.1 2005

The main reason for the lockable switch on the input/output of PV grid connect inverter is due to TWO supplies to the switchboard; one is the mains supply and the other from the inverter when in export mode. When AS 4777.1:2005 was being drafted, and I was one of the NZ representatives on the drafti...
by pluto
Wed Sep 30, 2020 9:23 am
Forum: Transportable Installations
Topic: Caravan UK socket
Replies: 2
Views: 1754

Re: Caravan UK socket

Read ESR 2010 regulation 61A for the correct answer for a CI. that is why it is not in appendix C of 3001:2008.
by pluto
Wed Sep 30, 2020 9:18 am
Forum: Transportable Installations
Topic: Caravan UK socket
Replies: 9
Views: 4857

Re: Caravan UK socket

Read ESR 2010 regulation 61A for the correct answer on socket outlet type in a CI, that is why it is not covered in Appendix C of 3001:2008
by pluto
Fri Jul 31, 2020 9:47 pm
Forum: Protective Devices
Topic: MCB's as isolators
Replies: 4
Views: 5245

Re: MCB's as isolators

see AS/NZS 3000:2007 +A1 +A2n clause 2.3.2.2.2.
by pluto
Thu May 28, 2020 5:23 pm
Forum: Transportable Installations
Topic: DR AS/NZS 3001.1:2020
Replies: 4
Views: 3955

Re: DR AS/NZS 3001.1:2020

Keep reading the Draft AS/NZS 3001.1 and AS/NZS 3001.2 there are lots more errors to find and make comment on.
by pluto
Wed Apr 29, 2020 9:04 am
Forum: Protective Devices
Topic: HRC to MCB discrimination
Replies: 3
Views: 4258

Re: HRC to MCB discrimination

Manufacturer's data is usually best, some have it as an PC application and it is easy to use. Standards are also Ok to use but will cost many dollars to get and you will have to draw your own tables to a common time v's current to a common scale so that you plot the two graphs on top of each other. ...
by pluto
Sat Apr 25, 2020 5:24 pm
Forum: Generators and Solar
Topic: 3 Phase motor running on generator
Replies: 2
Views: 1982

Re: 3 Phase motor running on generator

The starting current of the motor is one of the critical factors you have to consider. Remember DOL starter current is up to 8 times the running current when starting. The use of a motor starter (and a compression lifter in the case of an air compressor) to reduce the starting current is essential, ...
by pluto
Mon Apr 20, 2020 11:52 am
Forum: Protective Devices
Topic: Type S RCD Main Switch
Replies: 10
Views: 4998

Re: Type S RCD Main Switch

All the AFDD devices I have seen are only rated at 25 A max and you need one for each final subcircuit.

Whereas an RCD can have a higher current rating and can be applied to multiple final subcircuits with a single RCD.
by pluto
Mon Apr 20, 2020 11:52 am
Forum: Protective Devices
Topic: Type S RCD Main Switch
Replies: 10
Views: 4998

Re: Type S RCD Main Switch

All the AFDD devices I have seen are only rated at 25 A max and you need one for each final subcircuit.

Whereas an RCD can have a higher current rating and can be applied to multiple final subcircuits with a single RCD.
by pluto
Mon Apr 20, 2020 8:47 am
Forum: Protective Devices
Topic: Type S RCD Main Switch
Replies: 10
Views: 4998

Re: Type S RCD Main Switch

The longer delay of Type S is for discrimination purposes, with the downstream RCD closest to the final subcircuit providing the personal protection required by ESR 2010.

The use of a 300 mA RCD can in most circumstances also provide discrimination between the upstream and downstream RCDs.
by pluto
Sat Apr 18, 2020 12:12 pm
Forum: Selection and Installation of Wiring Systems
Topic: Parallel conductors 3.4.3
Replies: 11
Views: 5345

Re: Parallel conductors 3.4.3

The outcomes for 4 mm2 min conductor parallel limitation comes from the IEC 60364. The outcome required is the distribution of the total current evenly between all cable cores in parallel so they must have the same impedance for this to occur. This means the conductor material, cross-sectional area ...