General > General Technical Chat
Is this Wiring Legal? (NSW)
themadhippy:
--- Quote ---would it be worth calculating the diversity of the circuit
--- End quote ---
don't know about australian regs,but in the uk it wouldn't make any difference
EEVblog:
I heard back from them:
--- Quote ---"It is standard practice and within the all rules to add an existing appliance to a power cct as long as it does not draw above 10amps.
It also needs to have a dedicated isolation switch so the unit can be serviced and to follow code.
The current for a 3.5 kw system is well below the 10amp max.
When we are talking 3.5 kw it is cooling capacity not anything to do with electricity consumption.
Any kitchen appliance would draw much more than the AC.
However you are correct about the wires that are visible they should not be shown this needs to be rectified and I need to make sure that an isolation swish has been fitted so the unit can be serviced without turning off your power.
It’s extremely important to us to get this done correctly as we do not cut corners and need everything to be done to code."
--- End quote ---
Ed.Kloonk:
--- Quote from: EEVblog on December 08, 2020, 09:39:10 pm ---I heard back from them:
--- Quote ---"It is standard practice and within the all rules to add an existing appliance to a power cct as long as it does not draw above 10amps.
It also needs to have a dedicated isolation switch so the unit can be serviced and to follow code.
The current for a 3.5 kw system is well below the 10amp max.
When we are talking 3.5 kw it is cooling capacity not anything to do with electricity consumption.
Any kitchen appliance would draw much more than the AC.
However you are correct about the wires that are visible they should not be shown this needs to be rectified and I need to make sure that an isolation swish has been fitted so the unit can be serviced without turning off your power.
It’s extremely important to us to get this done correctly as we do not cut corners and need everything to be done to code."
--- End quote ---
--- End quote ---
Make sure the bloke that does the iso switch doesn't just unscrew the active at the terminal on the compressor and then run two wires over to the isolator. It's a no-no. The machine, whilst can be turned off, is still 'hot' inside, understand.
TERRA Operative:
As an Australian electrician (Well, now an AU sparky living in Japan), when we would install aircons, they would always get a dedicated feed from the switch board and an isolator switch.
The work as shown in Dave's photos is completely non-compliant and wouldn't pass any inspection.
Exposed single insulation, junction box not fixed down, I can't see the rest of the wiring but all wiring needs to be clipped into place and supported unless the roof space is less then 500-600mm or so (Have to check the exact measurement).
Also, at 9 amps, I wonder if they did a maximum demand calculation before hooking it into the circuit? I doubt so... Inspectors love to ping on that detail.... It's a good way to get nuisance tripping at the best (Why does my power always go out when I dry my hair with the aircon turned on??) and a fire at worst.
I'd be pushing for a dedicated feed with a separate breaker, it's no fun when a future faulty aircon takes out power to half the house during the night.
Kudos for choosing Mitsubishi too, they along with Daikin do make nice machines (I have all Mitsubishi in my place).
Monkeh:
--- Quote from: EEVblog on December 08, 2020, 09:39:10 pm ---I heard back from them:
--- Quote ---"It is standard practice and within the all rules to add an existing appliance to a power cct as long as it does not draw above 10amps.
It also needs to have a dedicated isolation switch so the unit can be serviced and to follow code.
The current for a 3.5 kw system is well below the 10amp max.
When we are talking 3.5 kw it is cooling capacity not anything to do with electricity consumption.
Any kitchen appliance would draw much more than the AC.
However you are correct about the wires that are visible they should not be shown this needs to be rectified and I need to make sure that an isolation swish has been fitted so the unit can be serviced without turning off your power.
It’s extremely important to us to get this done correctly as we do not cut corners and need everything to be done to code."
--- End quote ---
--- End quote ---
Clearly they do cut corners.
If the circuit is lightly loaded then yes, it seems reasonable enough to run the AC off it, but as above, did they do any calculation, examine the utilization of the circuit, or just use it because it was convenient? Considering the workmanship I think the answer is clear..
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