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Local Isolation For A/C Internal Units

Sparkymania
Hi

Doing EICRs, and the remedials resulting from them.


An issue had been raging as to whether an internal unit needs to have a local isolator.

There have been 2 schools of thought over this issue with others I am working with.


First one:

It is a an electromechanical piece of equipment and needs a local isolator even though it is being fed by an external unit that has it's own isolation.

Second one:

It is fed by the external unit and they are both one piece of equipment even though they are split with the two parts in different places. Turning off the isolator to the external unit isolates all the equipment.


In my opinion a local isolator is still needed as there is no way of knowing if the internal unit is definitely part the the external unit being isolated. It may just be off at the controls.


I have come across many A/C units that have been installed by A/C engineers and they have not put an isolator on the internal unit. I'm wondering if there is a reason that they don't or if it's just ignorance of the regs on their part. I would have thought their training would have included that. Is there something that they know that means they don't need to install an isolator to the internal unit?


Anyone have any thoughts?


Thanks

Parents
  • 0
    Twenty-eight years ago, back in 1992, I was on the good ship Discovery Bay/GYXG a first generation containership.  At the time that our annual Radio Survay was due, we were in Italy. The Italian Government Radio Surveyor decided that we required an isolation switch mounted adjacent to the radar scanner to prevent rotation. This in case whilst someone (a Radio Officer such as me, maybe?) was working on the radar scanner, someone else (a Navigating Officer or even the Captain...) turned on the radar in the wheelhouse - despite it being switched off and appropriate signs exhibited - (I never ever saw provision for locking off a radar) and the rotating scanner injures the said Radio Officer.


    This isolation switch as apparently required by Italian law and certainly not UK law, did not stop the radar transmitter from operating and therefore, whilst once fitted and if used, I would not get hit by the scanner, but it was OK for me and/or whoever else was up there to get gently(?) microwaved by the radar transmission, X-Band (10GHz) or S-Band (3GHz) now from a stationary scanner...


    It was likely a scam, since the requirement was for the Radio Survey to be carried out to the Flag State (UK) requirements, and luckily to avoid delay the Italian Survey had a couple of Italian Technicians in tow.....


    Additionally, on other ships after the Discovery Bay, besides my day-job as Radio Officer I also found that monitoring and repair of integral refrigerated containers (ie those with built in refrigeration equipment), became one of my chores. Thus installing a split- aircon is not that much of a technical problem, say no more!


    Clive

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  • 0
    Twenty-eight years ago, back in 1992, I was on the good ship Discovery Bay/GYXG a first generation containership.  At the time that our annual Radio Survay was due, we were in Italy. The Italian Government Radio Surveyor decided that we required an isolation switch mounted adjacent to the radar scanner to prevent rotation. This in case whilst someone (a Radio Officer such as me, maybe?) was working on the radar scanner, someone else (a Navigating Officer or even the Captain...) turned on the radar in the wheelhouse - despite it being switched off and appropriate signs exhibited - (I never ever saw provision for locking off a radar) and the rotating scanner injures the said Radio Officer.


    This isolation switch as apparently required by Italian law and certainly not UK law, did not stop the radar transmitter from operating and therefore, whilst once fitted and if used, I would not get hit by the scanner, but it was OK for me and/or whoever else was up there to get gently(?) microwaved by the radar transmission, X-Band (10GHz) or S-Band (3GHz) now from a stationary scanner...


    It was likely a scam, since the requirement was for the Radio Survey to be carried out to the Flag State (UK) requirements, and luckily to avoid delay the Italian Survey had a couple of Italian Technicians in tow.....


    Additionally, on other ships after the Discovery Bay, besides my day-job as Radio Officer I also found that monitoring and repair of integral refrigerated containers (ie those with built in refrigeration equipment), became one of my chores. Thus installing a split- aircon is not that much of a technical problem, say no more!


    Clive

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