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BANGKOK 17 June 2019 02:35
myjawe

Water heater installation, what could go wrong ?

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An RCD or RCBO device will save you from death in the event you touch or otherwise contact a live wire (via a faulty appliance for example). This is particularly important in Thailand where the electrical installations can be somewhat suspect (particularly grounding).

 

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Posted (edited)
21 minutes ago, myjawe said:

 

hello, I have no test button anywhere. Everything is working fine. Why adding something to the electric system, and what ? thank you so much.

 

 

 

 

 

This is what we are talking about and most Thai will know this brand as has been made here for 40 years now.  It continually monitors hot and neutral lines to make sure the same amperage on both - a slight difference will immediately cut power and normally save your life if you are getting a shock.  As most outlets here are not grounded, or suspect, it is a very good protective measure to have such a unit.  There are many other brands and all, if designed for home safety use, should work about the same.  As said there normally is a built in unit for water heaters which protects user. 

Image result for safe t cut thailand

Edited by lopburi3
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Disgusting piece of equipment. Offers zero protection to vulnerable or uninformed consumer. 

 

Not recommended, it is open to abuse by unscrupulous chancers.

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2 hours ago, Snackbar said:

Disgusting piece of equipment. Offers zero protection to vulnerable or uninformed consumer. 

 

Not recommended, it is open to abuse by unscrupulous chancers.

For sure it is not perfect and if you have a better more safe idea please let us know. 

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On 5/17/2019 at 10:46 AM, Beggar said:

In respect of putting the water heater and a hair dryer to the same switch. Both could be switched on at the same time. So you have to make sure that the cable going to the switch supports this wattage and also make sure that the fuse protecting this cable fits. 

Not if you come off of the line side of the switch to the outlet 👍🏼

Good advice on the cable & fuse sizing. Furthermore, if you break gauge from the water heater feed to the outlet you need to size the breaker to that of the smaller cable 

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9 hours ago, Snackbar said:

Disgusting piece of equipment. Offers zero protection to vulnerable or uninformed consumer. 

Not recommended, it is open to abuse by unscrupulous chancers.

 

You do seem to have a bit of a thing about RCD/RCBO units, is it a particular brand (Safe-T-Cut perhaps) or these devices in general?

 

Perhaps you could enlighten us, these things (like seatbelts) are by no means perfect, but they are proven to increase the chance of survival from both direct and indirect contact with live items.

 

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11 hours ago, rwill said:

But the bathrooms in America are not designed for the whole floor to be wet.  

Totally irrelevant.  Water is not a requirement for contact or fault to ground.

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Posted (edited)

Single pole RCD B1500.00 - simple to install in 5 mins, trips to identify earth leakage - perfect.  Total cost - B2000.00

 

Safety Cut B5000.00 - 3-4 hours to install, doesn’t identify which circuit  has a fault. Can be turned off, manipulated by the unscrupulous. Total cost - B8000.00 +++

 

Which one is a local ‘spark’ going to recommend?

Edited by Snackbar
Some people are unaware of the obvious.

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@Snackbar now I understand (and I am in agreement) 🙂

 

The modern Safe-T-Cut units no longer have the hazardous "direct" or "bypass" function, I don't think I've seen one set to anything other than 30mA so the more sensitive options are a waste of money.

 

Don't forget your single-pole RCBOs (not just RCD) are 1,500 each, and you need one per circuit you want to protect. Absolutely the best solution but they can be a real pain to get working if you have an existing system with zillions of borrowed neutrals 😞

 

A single front-end RCBO replacing your existing main breaker (or an RCD added to the existing MCB) is also a solution if you have room in your board to install it. Same "one out, all out" problem as the Safe-T-Cut but better than half the price.

 

The Safe-T-Cut (expensive) has the advantage that it's a simple to install box, no mucking about with the existing wiring (apart from removing the MEN link in the board if one exists).

 

A good halfway-house which is popular in the UK, would be a split or dual-RCD board. Split the circuits between two RCDs so if you have a failure you only lose half the supply.

 

 

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What is a ‘browned neutral’ 

 

Not mentioned in here

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Posted (edited)
10 minutes ago, Snackbar said:

What is a ‘browned neutral’ 

 

Did you mean "borrowed"?  I know the US NEC has (or at least used to have) discussion specific for that.  Actually, there is one case where it is required:  For kitchens, there must be L from the phase left and L from the phase right (2 circuits) with N shared.  That is the only exception.

Edited by bankruatsteve

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9 minutes ago, Snackbar said:

What is a ‘browned neutral’ 

Not mentioned in here

 

It's not mentioned in my post either, go back and read it again (no I have not edited it).

 

You probably won't find it in BS7671 or the OSG either.

 

You will however find it mentioned often on the IET forums.

 

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