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Which Air conditioner to buy?

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The adiabatic equation you linked to is the same for a phase wire as for a protected earth wire so I don't know what you are trying to say.

Where in electrical standard safety regulations does it state that you are allowed to use a smaller protected earth wire than the phase wire (if wire size is below 16mm2)?

 

 

 

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9 hours ago, lom said:

Furthermore, there does not to my knowledge exist a multi conductor cable where the green-yellow protective ground wire is smaller than the phase or neutral wires.

You are digging your hole deeper (not a wise move unless it is for your alternative suggested profession)

 

10 hours ago, lom said:

. 

Your knowledge of cable availability  is a limited as you knowledge of acceptable (as in within regulations) wiring practice seems to be. 


Here is a cable example to widen you knowledge line and neutral are 2.5mmF2ECB1DE-BE87-48DC-81AC-C2AF1DDAC842.thumb.jpeg.53d9255054246050f74f54cd929ab1f1.jpeg

 

the U.K. standard is that the Earth should be at least 50% of the line and neutral (please note you do not add line to neutral and divide by two) so that requires 1.25mm minimum.

 

10 hours ago, lom said:

For protection against electrical shock you are not allowed to assume that there is a MCB or a correctly sized fuse that will trip.

You must assume that the protective earth wire is the only protection against electrical shock hence can withstand the same current as the phase conductor.

Please post a copy of, or link to, that information.

 

it is of course obvious (or it should be) that a conductor is perfectly capable of carrying a much higher current for a short period than the normal continuous rating.

 

Do please stop giving wrong information.

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5 hours ago, lom said:

The adiabatic equation you linked to is the same for a phase wire as for a protected earth wire so I don't know what you are trying to say.

Where in electrical standard safety regulations does it state that you are allowed to use a smaller protected earth wire than the phase wire (if wire size is below 16mm2)?

 

Before we go on, which country's regulations are we going to use?

 

BS7671, AS/NZ3000, NEC something else?

 

EDIT An whilst we are at it which grounding/earthing scheme TT, TNS, TNC (very rare), TNC-S.

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As a talking point here we have detail from Aus.

 

image-asset.png?format=750w

 

I note that the ground size for 2.5 is actually more stringent than the UK.

 

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Posted (edited)

I have a Daikin downstairs, 18k BTU inverter model, works well... but the Mitsu in the bedroom is the best design - extremely simple to clean.

 

However, you get to pay extra for the Mitsu - I got mine when the refrigerant was being phased out, so I paid about 66% of the ticket price of a new model. Otherwise I'd go with Daikin.

 

I'm sure that Hitachi and Panasonic are great too, but not sure about maintenance/cleaning.

 

Something else to note about inverters - they usually have some kind of 'saver' mode which adds 2 celcius to the setting when you're not around (Daikin has a magic eye function), the Mitus has a 'saver' and also a 'memory' setting, so I set it at 29 when I go out - it keeps the room from cooking too much and makes it easier to cool when you get home.

 

The total consumption from running the bedroom air 24 hours now is cheaper than I used to pay when I turned off my 'simple' a/c unit in a condo in the past every time I went out. The other benefit is that the living room downstairs rarely goes up past 29 as the heat doesn't come down through the house as much.

Edited by ben2talk

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On 6/6/2018 at 8:04 PM, Orton Rd said:

we have Mitsubishi heavy duty in the bedroom, I always have found it VERY noisy even though we have it service by mitsu guys. I'd go for Daikin

Mitsubishi Heavy Duty is rubbish - we're talking about a different company right? Mitsubishi Mr Slim inverter is a totally different animal

 

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11 hours ago, Crossy said:

As a talking point

(Netherland)

As I have learned is that with earthing you has to look on two points with the wire diameters.

1. The wire diameter from the live/neutral.

2. Resistance.

 

Diameters:

In nominal installations from the customer unit to the outlet the earth wire is mostly the same diameter as the outlet.

In this case all the wires are 2.5mm

 

Lightning and switches are mostly 1.5mm, and earth is the same.

 

With bigger current (which are mostly not used with consumer outlets but direct connection or Cee form plugs) the size of the neutral and live is bigger, but the earth wire not.

In this case Live and neutral can be 4mm2 and earth 2.5mm

The earth wire diameter will be bigger when we are talking about 10mm2 and up live/neutral.

 

 

The resistance: If the link from the unit to another unit (can be a secondairy CU or the earth pen or bonding to gas/water (revisited, now plastic pipes) the wire diameter should be big enough that the resistance is not higher than 25 Ohm. (30max)

 

 

For me, here in Thailand I keep the same 'standard' and not trusting the nail in the wall method :whistling:

 

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