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  1. C

    Thermal overload 3 phase to single phase pump

    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...
  2. J

    Why do soft starts tell you to set the overload at (delta FLC/1.73)

    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.
  3. Ironbones

    Commercial Still Learning -Whats this for connected to contactor and overload.

    Hi All 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...
  4. Ian1981

    Overload protection to a central heating pump x2

    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...
  5. Adam_92

    Setting the overload on a direct online starter

    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...
  6. D

    Anyone use the Hylec DOC contactors and overload relays?

    Type: 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...
  7. S

    Does this bell transformer have overload protection?

    Hi Folks 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...
  8. R

    Difficult overload omissions question

    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...
  9. J

    Overload relay with aM fuse

    Hi 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 Please explain...
  10. M

    1361-2 overload blow, time How long?

    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...
  11. J

    Most difficult fault

    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...
  12. C

    struggling to reset Mains after overload

    Greetings all. 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...
  13. C

    Potential overload of ring mains

    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...
  14. T

    Overload protection omission

    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...
  15. HoverSPRX

    No Overload Protection on DB wired to Busbar

    Hi all, 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...
  16. O

    Overload Protection - Major Renovation

    Hi All, 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...
  17. P

    thermal constraints

    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...
  18. A

    Beko Condenser not heating

    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? Thanks
  19. Pat H

    Domestic Cable size less than protective device rating

    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...
  20. biospark80

    Industrial Setting the overload on a motor circuit contactor.

    Hi 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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