canada

  1. G

    DOL starting 3 Ph Motor and an RCD

    Hi, I am having trouble with a 3 phase motor (about 1kW I think) and a tripping RCD. The motor is DOL started through a contactor and thermal overload. Starting the motor causes the RCD to trip instantly. Is the starting of the motor causing this and would soft-starting the motor solve the...
  2. H

    problem with 3 phase rcd feeding sub main

    Just been to look at job tonight in a commercial kitchen where they are experiencing nuisance rcd tripping. Bare with me while i explain the scenario! A separate/outside food store and prep room has approx 5 large fridges/freezers, lights, insectocutor, and a small computer printer for orders...
  3. H

    metal containment within battery store

    does anyone know if there is any chemical reaction with galv conduit within a chemical/battery store? is enamal better
    • hodgey1972
    • Thread
    • battery canada containment electricians' talk metal normally roman store system times within
    • Replies: 6
    • Forum: Electrician Talk | All Countries
  4. S

    Mech interlock in schematics

    I've seen many schematics but need an affirmative on where you place the 'triangle' in schematics. I've seen them between coils and contacts but what is correctamundo... Is it shown between coils or between contacts? I'm thinking contacts because thats what its inhibiting movement of. Am I...
  5. D

    metric thread to imperial

    i've got to adapt from inch to 25mm in galvanized steel i know there's adapters available but; can i fit a 25mm coupler onto inch steel tube or thread 25mm tube into inch female socket -without using adapters been a while so i can't recall thanks
  6. T

    32amp isolator for air con

    Hi need to install swa for air-con unit with a 32amp isolator. not used swa much so wondered if I need 4mm or will 2.5 suffice?
  7. P

    Retail unit - what's this?

    I'm a baker looking for a retail unit. One of my first questions is always electricity supply. I'd appreciate a diagnosis of this supply. If I move into the unit I'll be looking for an electrician in SE4, London; any recommendations or offers appreciated. The photo below doesn't look like a...
  8. D

    Testing for harmonics

    Im sending in a request to DNO for a supply increase from 200KVA to 400KVA to allow for 3 machines im bringing from other premises, all simple enough if it wasnt for the fact that these are large machines with hefty DC motors all running off Drives, although they are screened and earthed...
  9. K

    wade88

    Your PM box is full The answer is If the belts are “squealing” then the chances are they are worn or glazed. Glazing is when the surface of the belt has been hot and the material has hardened. For the belt tension get yourself a Fenner tension gauge.
  10. L

    RLC Circuits - Phasors

    Hi Guys, Just wondering if anybody would mind explaining the main purpose of working out the lead/lag of current compared to voltage in RLC circuits? Is it to do when selecting/derating cables for current carry capacity? Is there any other things that happen? maybe extra heat build up in...
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