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Boiler panel controlling a 3 phase grundfos pump. Pump was tripping thermal overload...
Pump replaced for a single phase grundfos by engineer etc...
I was asked to convert the control circuit to single phase which I did.
But still tripping on the thermal overload.
Set it slightly higher for...
Hi I have a question on soft starts. Why do soft starts have motor FLC delta /1.73. I’m confused as I understand star delta it is set at 58% of the full load current as the overload is in line with the windings. Thanks for your help in advance.
Could someone explain this to me please. Connected to the contactor, over load are two coils (are they ferrite chokes) please see photos. Also why only two and not three one for each phase, marked with a 65 in the photos.
The motor is used to control a blower unit, that moves a bean...
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...
Hi I’m sitting my AM2 next month and have found out that you need to set an overload on a direct online starter motor circuit.
I have tried asking my supervisor and assessor,tutor at college not one of them have given my a straight answer..
Is this the formula?
Its 3 phase so formula is...
Hylec-APL | Motor Control Gear | Contactors - https://www.hylec-apl.com/contactors
Hylec-APL | Motor Control Gear | Thermal Overload Relays - https://www.hylec-apl.com/thermal-overload-relays
Got a project coming up where I need to remotely start about 20 pumps so looking at Hylec as...
I bought one of these Door Bell Transformer | Stevenson Plumbing & Electrical Supplies - https://www.stevensonplumbing.co.uk/door-bell-transformer.html?gclid=EAIaIQobChMIwLOp8p7A3QIV7grTCh3TzQvbEAkYAiABEgIxmvD_BwE as it's SELV and supports illuminated pushes, but can't find any...
Q12 Omission for circuit protection against overload may not be given to
which of the following:
1. Fire Panel supplies
2. Control circuit for fire extinguishing equipment
3. Exciter circuits for rotating machines
4.Supply circuits for lifting magnets
I'm guessing it's the control circuit but...
Can we use an aM fuse with overload relay,?
If yes can an aM fuse protect the conductors from damage incase of short circuit
Since i suppose aM fuses are used only for motor protection and cable.
How will cable protection achieved when aM fuse is used with an overload relay
Guys, Just to settle a debate i had earlier with another spark.
100A 1361-2 DNO fuse, constant current of 130A.
He thinks it will blow within minuets.
I think it will last a good few hours. (At least).
I cant find any time/current info on 1361 fuses, but would quite like to know the answer...
Just wanted to know out of curiosity difficult wiring faults people have come across in there careers? what type of fault, and how you got to the bottom of it,
Some faults are easier to find than other, maybe the fault was an emergency call out or perhaps something that was picked up on a EICR...
I have the lowest cost supply of electricity available here in France. that means that I can only have a few heaters running at the same time as the oven is on or the main rcd supplied by the electricity company trips.
now my problem is trying to turn it back on again. it refuses...
At a house viewing I saw a dozen electric radiators connected mainly by plugs into wall sockets, one or two (in bathrooms) connected to fused spurs. I calculated nearly 14Kw and I'm given to understand all these rads are connected to either of two ring mains with 32A breakers.
A quick look at...
Hi folks, not posted in a while but I have been having a few interesting discussions about this one !!!
I have come across a cooker connection outlet which is wired in 6mm and supplied via 45a dp sw and a 32a MCB
Now in this outlet I have an oven at 3kw wired in 2.5mm HOFR and a sparker for...
I recently carried out an EICR on a biolabs, it has a DB in the mains room that was wired direct into the busbar on 25mm tails within 3M. The busbar is on a 200A fuse and the DB in question is a 24 way three phase board.
I know that 20 + years ago when this was installed some guy has...
First post on this forum, but I've been reading the great questions and answers for years, so I hope someone can help me out?
I've renovated a few houses in my time and done some of the basic wiring myself, but my latest 1940's house is a real project and needs a professional's...
what 2 methods are they to determine the sustainability of a protective conductor for thermal constraints during earth fault conditions??
And might be a long shot but can anyone tell me what component of a RCD will operate for a ..
a. line to earth fault 2.3 ohms
b. line to neutral fault 0.01...
hi, I have a Beko DC7110 condenser dryer that's not heating, I have cleaned out all filters etc, the heating element has been replaced(which includes thermal overload) and the front thermal overload has been resistance tested and is fine, what could potentially be the reason?
Noted today an interesting comment on page 43 of christopher kitchers Practical guide to inspection, testing and certification of Electrical Installations ( a great book )
Under Shower curcuits he states:
For this type of circuit it is possible to have a cable which has a current rating of less...
I haven't much experience on this subject so thought id ask!.
I need to choose and set the overload on a circuit contactor containing an overload. It's a 3ph motor rated at 14.1 amp do i set the overload at the same current rating or just above due to the initial inrush?
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