canada

  1. S

    telemecanique limit switch query

    Hi allwe have got a telemecanique limit switch on a sprinkler valve to indicate a fault situation if the main valve is to be shut for any reason. The client has now asked for the intruder alarm to be linked to this valve also in order to fulfill these requirements , both parties need a clean...
  2. H

    Air Circuit breakers

    Hi Everyone , i havnt fitted one of these before and i need to do so as a retrofit into and existing panel board. the reson for this is a down grade in their load and therefore i wish to fit a protective device to protect the current wiring against the new lower load. I also intend to fit a...
  3. Amp David

    Star Delta Starter

    Can anyone advise of a good reliable supplier off star delta starters please. Local places don't do this sort of stuff and not driving miles to somewhere that will, so online is preferred. Thanks for suggestions.
  4. R

    generators

    Does anyone have any experience of testing when generators are involved? All ZS readings come out too high for RCBO's that protect the circuits! any help or advice would be greatly received.
  5. T

    3 phase for industrial unit

    Hello to you all. I am new to these forums, and not a qualified sparky, but after your advice. I am the MD of a company that has moved to a new industrial unit, well part of a unit. The unit is 22k sq ft, and has about 6 CU spread around the walls. We are letting around 10k sq ft, and have 1 of...
  6. M

    Sub main board question

    Hi All. I'm finally getting to start the installation that i'd asked advice on in October. However there have been some changes i've had to make i may or may not be on the right track. The plan was to put in an 8 way cu (sub main) with 6 RCBOs' to divide up a computer suite, 25 PCs', data...
  7. N

    3 phase motor

    Hi This is probably a basic question but I have just wired in a large radial arm drill for a customer all working except the slurry lubrication pump. It has a 3 phase motor but only has 3 leads coming from the windings can someone explain how to go about testing this please. I have done an IR...
  8. ipf

    forgetful or just plain lazy

    Whilst converting an old factory into offices to let, I've been asked to remove a redundant 3ph supply and meters. They are hidden away and have been 'disconnected' for about 15 years, when a new supply was provided. I vaguely remember the DNO agreeing to disconnect and left it in their hands...
  9. P

    Not done any HV stuff but this cant be right

    bored just now and found this Termination of 240 mm2 LV XLPE cable using thimble designed for 400 mm2 cable - YouTube surely he shouldnt be doing that, folding over the cores, should he ? please dont slate me for not knowing but ,,,,,,, Jamie
  10. N

    Trouble with a 3 phase motor

    Here is mty problem: 3-Phase motor for air extraction Motor 1: 220/440 Y V HP:5 I: 15.8/7.9 amp RPM: 1740 FP:0.78 n:79.4% Tn/To: 20.4/47nm FS 1.5 Motor 2: 220/440 Y V HP:7.5 I: 21.8/10.9 amp RPM: 3480 FP:0.87 n:77.4% Tn/To: 20.4/47nm FS 1.5 Problems: 1. The motor 1 was burned out after...
  11. C

    Current imbalence in a 3phase p.t.o driven generator.

    A number of 3 phase induction motors and a single phase motor are fed via a p.t.o driven generator. There is a small current imbalence between the phase feeding the single phase motor and the other 2 but this i think is acceptable. How much of a current imbalenbce in amps (A) would be deemed...
  12. K

    Artificial 3 phase.

    OK we’ve got nice fancy boxes of gubbins if you want to run a 3 phase motor off single phase now. I’ve just found my Brook motors electricians bible after loosing it for near 5 years. The bible was given to every industrial electrical apprentice up until the late 70’s. There were ways to run a...
  13. B

    Did a bit of digging today.

    Anyone seen a joint like this before? I certainly haven't. 400mm 3core going into it. 6 x 630mm singles coming out (2 per phase) @11kv Found a short to earth on two phases.
  14. A

    3 phase volt drop

    (sorry this went into a few forums it should not have -my bad) Any help would be great A volt drop calculation that i could do with some help with is the 3 phase VD I fully understand the single phase vd calculations but just wanted to get a confirmation when using 3 phase. e.g Say a large...
  15. K

    My dream test bed

    :innocent: Sorry but I couldn't resist it :innocent:
  16. S

    Checking Earth on an Industrial Equipment

    Hi Guys, Well i am a newbie on here, I have an Industrial Machine and I need to renew the Earthing Rods, The machine is of 3 Big Units and I want to make sure the earthing I install is enough for the requirement. The power source is a 350KV Generated power. Any Info will be welcomed. Thanks...
  17. G

    Proportional Control Vs. On/Off Control

    Hi, I have a pizza press at work with heating elements going through the large metal platens that form the top and bottom press. The heating elements maintain the temp of the platens constant using on/off control. As a result of this the temp fluctuates quite a lot. So, if they are set for...
  18. H

    Emergency lights and bonding to water pipe

    I have two questions. Firstly I need to bond the water pipe where I work with 50mm (PME, with a neutral over 150mm). It just so happens the structural steel is bonded and would do very well as the bonding for the water pipe if I run a 50mm to it. I have loads of 35mm green and yellow, can I...
  19. P

    School labs

    Is there a regualtion that states 5mA protected isolation transformers must be used in a lab enviroment to supply socket outlets or a specific set of regs regarding installations within labs. Thanks guys in advance.
  20. cliffed

    nearly

    hav u ever had a nearly big mistake, i was making off 95mm 4c swa inn2 a main switch,everything was going splendidly when,i cut the last 1 slightly shorter than i suppose 2 .Panic...then after alot of swearing...i noticed the panel the switch was mounted on had moved slighlty of its fixing...
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