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canada

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  1. N

    Great alteration

    Got called to a fault at commercial premises yesterday and thought i would share what i found. The initial call was to an isolator which was worn and kept going off so did the usual isolation and was a bit confused as breaker was single phase and isolator was tp&n, took cover off and found out...
  2. D

    Main Earth Bonding in a Commercial

    Hi, need abit of help in regards to earth bonding. I'm working on a building with 10 studio flats and all the plumbing is done in plastic pips apart from the terminations of the shower and the water heater. the main incoming water supply is via a blue plastic pipe, which goes into a manifold...
  3. D

    You think the industry is tightening up on safety then i walk on this site......

    Just got a random call from a guy based in bristol asking me if i could go to a building site local to me in Bradford and look at a cable thats sparking for him as they supply the generators and cables, well not for one to turn down what seems a quick repair job i popped over. It turned out to...
  4. L

    Prospective Fault Current

    Hi Guys, We measured PSCC on a three phase dist board in a commercial establishment. This board is fed from a main switch board with a main 400Amp switchfuse with BS88-2 fuses rated at 88kA. Feeding a second 160Amp switchfuse with BS88-2 fuses protecting the cabling to the board we were...
  5. V

    Educating people about poor practices?can it be done?

    Getting thoroughly fed up with the general state of where I work. Ok,it's an old place and of course wirings changed a lot over the years but in our game I'd say good drawings etc are even more important than a neatly wired panel and that's where this place massively falls down. Everywhere I...
  6. E

    Emergency lighting regs

    What are the laws /regulations on emergency lights? In a church hall we have lots of the 13W non maintained type that come on when the mains fails. The ones at exits have the green exit sign on them. But the joined on church (medieval type anglican) has one over main exit only with no green...
  7. T

    baldor 1 hp ac motor wiring from 110 to 220

    Please help, I'm using a Baldor 1hp 110ac motor in Italy (220) with a transformer, It's causing many problems with heating, I was told that changing the wiring the motor could run from 110 to 220 except i have no diagram and the 9 wires coming out of the housing are all the same color with...
  8. G

    RCD protection for portable equipment with Inverters

    Hi, I know this has been covered before and I don't mean to repeat questions. I am looking to get some opinions on a problem I have encountered in the past and have experienced recently. I have a machine with two 3ph motors which are controlled by Inverters. They are 1ph - 3ph Inverters. The...
  9. sparkdog

    College student/teacher accomodation 3 phase

    I would just like any comments if this seems OK.I have a rewire/new install to do on the above which is a second floor with about 8 rooms to have its own cu and they want a small kitchen at each end with a hob and oven also two power points in each room and lighting,no electric showers or...
  10. 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...
  11. 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...
  12. 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
  13. 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...
  14. 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
  15. 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?
  16. 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...
  17. 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...
  18. 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.

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