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Posted By Topic: Machine Control panel design

Rishe
Aug 31 2017 19:36

Hi,

I am not registered as Electrician/Electrical engineer in NZ. But I am a recognized engineer (Level 7) and member in IPENZ (Engineering NZ).

Can I design (electrical circuit & PLC drawings) low voltage Control panels for industrial machines? (like packaging machine, food processing machine, etc.)

EWRB registered Electrician verifies my design & release drawings to build those control panels. Is it ok?
   

evanh
Aug 31 2017 21:03

When you say low voltage, I assume you mean the commonly used control voltage of 24 Vdc. Correct?

   

DougP
Aug 31 2017 21:24

You can design anything you want to regardless of your qualifications.

There is no requirement to involve a registered person until it needs to be connected to the supply as part of an installation and certified. Depending on who actually did the work to build it, will probably influence how easy the certification will be.

You might get some information from the thread in the link below. But as you don't have much of an understanding of electrical definitions, rules and regulations, you might just have 20 more questions...
https://www.electricalforum.co.nz/index.php?action=more_details&id=1496973425
   

Rishe
Sep 01 2017 07:57

Thanks for the response Evanh & DougP. I mean to 415V 3Ph & 230V 1Ph. Electrical drawings to control machine motors. PLC machine automation stuff.
   

AlecK
Sep 01 2017 08:27

Design is not listed as prescribed electrical work, so anyone can do it. Manufacture is also not PEW, so anyone can build the panels.

However at some stage the panel(s)will need to be installed and then connected to supply, and both installation & connection are PEW so restricted to holders of an appropriate licence. Whoever does those jobs will need to certify the safety and compliance of whatever they install /connect.

In doing so, they are entitled to rely on certain types of documentation, including supplier declarations of conformity (SDoCs), manufacturer's instruction (MIs), and "certified designs (CDs). This system means that legal responsibility & liability for the safety and compliance of the resulting installation doesn't rest solely on the installer; designers have to carry their share.

Design and manufacture should be to an appropriate Standard; and this needs to be documented. Else few will be prepared to install & certify. So, as designer, electrical theory is not enough. You'll need to be familiar with not only the technical aspects, but also the applicable regulations and the relevant product and installation Standards.