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Ian1981

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Is it a requirement to provide overload protection to a central heating pump rated at 2.77amps?
I’m kinda under impression that an almost 3 amp pump jamming will get rather hot.
I mentioned this to the heating installer who has requested we just installed 2 x isolators for the pumps through a contactor as to not switch the pumps through the programmer which makes sense.
I am aware that the regulations require that a motor 0.37kw requires overload protection of the motor but a pump is not a motor, at least that’s how I view it.
Thoughts please.
 
At the risk of being naive( and incorrect)I thought that the Difference Between a pump and a motor was that a Pump is a mechanical device used to raise or move fluids around using suction or pressure.
A Motor is an electro-mechanical device that converts electrical energy into mechanical energy.
 
At the risk of being naive( and incorrect)I thought that the Difference Between a pump and a motor was that a Pump is a mechanical device used to raise or move fluids around using suction or pressure.
A Motor is an electro-mechanical device that converts electrical energy into mechanical energy.
This is absolutely correct but what drives the mechanical pump, the mechanical energy from the motor.
 
Hi - have you got the pump? Possible that single phase units will have built in overload protection and be plug and play for Mr Plumber.
 
Haven't read the new regs, but in the 17th ed. Any motor under 0.37Kw was exempt from needing overload protection.
 
Haven't read the new regs, but in the 17th ed. Any motor under 0.37Kw was exempt from needing overload protection.
Yeah it’s in the 18th
The pump is rated at 2.77 amps high speed setting so it’s required and it’s not incorporated within fixed current using equipment
 
But surely the 0.37kW refers to the motor mechanical output, i.e 1/2 hp in old money. A 0.37kW single-phase 230V induction motor usually takes around 3.5A, so I think your pump motor is less than 0.37kW output and exempt from O/L protection
 
This is where ringing the technical department should clarify matters but all I got in response to my question was “it’s upto you as the electrician “
I’ve gone ahead and ordered the overload relay anyway to be on the safe side.
Perhaps not very technical on my part but nevertheless it covers my arse
 
This is where ringing the technical department should clarify matters but all I got in response to my question was “it’s upto you as the electrician “
I’ve gone ahead and ordered the overload relay anyway to be on the safe side.
perhaps not a very good technical reason but it covers my arse.
A lack of engineering knowledge of motors on my behalf
 

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