Advice needed on a sewage pump

[lennox]

Dark wood I'm not passing the blame but as its compliant and I didn't design the job I don't see the problem, when it's down to personal preference.but yes I would rather the control circuit to be low voltage but it's compliant and safe.

my point would be that as the submersible pump is 400v and if that seal fails then it's not going to be pretty either...

 

[Bobster]

Please don't take this like I'm having a pop.

How do you know it's complient?

 

[lennox]

As its not in a special location so doesn't have to be extra low voltage and manufacturers instructions (being 230v rated) and probably being double insulated also.

 

[davesparks]

As its not in a special location so doesn't have to be extra low voltage and manufacturers instructions (being 230v rated) and probably being double insulated also.

I believe you may have just opened the floodgates (pun intended)

 

[Darkwood]

The control set-up you have wired up has been done by yourself and not by the sounds of it as part of a control system supplied with the pump (unless you tell us otherwise). In wiring it up you become the designer and installer as the previous has buggered off, it is a motor with a control and very little of this set-up would fall under the scope of the BS7671 except maybe cable sizing and install methods hence the comment made about knowing if its compliant.... if your wiring this using just your knowledge of the BS7671 only then you cannot know if what you have done is compliant.

Whenever anyone with experience and competence working under the BS7671 only moves into any kind of control system design be it for a motor like a pump or a machine then they are subject to a very different set of regulations and from experience they are probably ignorant of them as they think the BYB covers all this work but in reality they couldn't be further from the truth.

We are not trying to trip you up here we are asking if you know the regulations that would govern an install of this nature? If it was just a plug and play kit then it would mostly fall under the BS7671 with the manufacturers having the responsibility for the design aspects, as you have taken over a job and had to work out how to wire it then you have designed a control system for a sewage pump and been the designer and how ever simple the circuit was to do, you are subject to a different set of regulations.

We are not telling you its right or wrong what you have done, I need alot more info for that but we are just telling you to heed caution on jobs like this as you may be breaching regulations you are not even aware of.

Take a look at the pig feeder thread for an insight to what could be a simple task ends up been a heated debate on the separate regulations that govern control systems.

http://www.electriciansforums.co.uk...lectrical-forum/100591-pig-feeder-system.html

 

[SheffSimon]

BS EN 60204-1:2006+A1:2009


Safety of machinery. Electrical equipment of machines. General requirements

BS EN ISO 13849-1:2008

Safety of machinery. Safety-related parts of control systems. General principles for design

would apply here.

Is the sewage tank a hazardous area, any potentially explosive gases where these float switches are, where the pump/motor are? If so, ATEX regs also apply.

It might look simple on the face of it, and it generally is when you know what you're doing, and when you know that it might not be as simple as it appears....

 

[courtwba1]

Totally correct sheff simon , the pump should be ex rated, the float swithes should be connected to IS barriers in the control panel and also any ducts should be sealed with an ex rated compund.

 

[Knobhead]

Totally correct sheff simon , the pump should be ex rated, the float swithes should be connected to IS barriers in the control panel and also any ducts should be sealed with an ex rated compund.

Do you know the location or circumstances?

Have you worked on sewage plants?

How can you give a blanket recommendation about the equipment to be installed?