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commercial

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  1. h.abrar94

    How to calculate the resistance of steel armour under fault conditions 70 oC for CSA 95mm2

    Hi All, hope your all well. I was hoping if I can please get some advice in regards to SWA. In Particular using SWA as CPC. Cable size 95mm2 I have a table for SWA which shows various information, in the last two columns it shows the "resistance of steel armour under fault conditions at 70...
  2. midsomerdave

    Motor wiring. 1 or 3 phase?

    Hello all. I have a problem that I'm sure someone can help with. The electric motor I have (pics attached) has no ratings plate. There are no supply wires shown, just the internal connection box wiring. The picture of the wiring diagram looks to be single phase but the box wiring has me...
  3. dokkan1080

    Rcbos in commercial installations

    Just a quick question Do rcbos need to be used on lighting circuits in a commercial setting? Eg on a new build school/hospital/what ever Or on a new circuit install on a school/hospital/ what ever commercial building?
  4. spud1

    What are the requirements for interfacing a new gas supply with a commercial buildings fire alarm system ?

    Hi Im working in a staffed residential home (for severe learning difficulties/disabilities residents) they have a new onsite tanked gas supply being installed to supply two domestic sized gas boilers in seperate locations, which will replace the existing big oil fired boiler. I need to clarify...
  5. R

    Diversity Calc Commercial Dishwasher 6.5kW single element

    It is a 6.5kW thermostatically controlled water heater if you ignore the rest of the gubbins. So that would be a Purpose #6 for diversity ie: None allowed. = 28A. But you could treat if like a cooker too. Purpose #3 ie: 10A + 30% FL current over the 10A. = 15.4A What do you think? Thanks
  6. The apprentice

    Gas shut of valve

    Hi there i have been doing a job for the past month re-wire of a pub with my journeyman this pub also serves food to the public now the kitchen guys came in who had there own spark to connect in some of the 3 phase stuff we installed a zone on the fire alarm panel for a gas shut of solenoid but...
  7. I

    Single Phase 230V supply and 3ph Compressor install.

    Hi guys, Have an option of an old, but really solid superb condition and well made large +/- 200ltr compressor from Denmark. Rarely used since purchased/Build 1987. Only supply I have is 230V Sing/Ph. Never had any dealings with 3 Ph. First name plate. Grundfos 3~MOT MG90LAR-24F115 No...
  8. James.B

    Looking to install a 3ph supply for 2 x 6kW fryer in a commercial kitchen.

    Hi everyone, I've looked at a job to install a circuit for a 2x 6kW fryer in a commercial kitchen and would really appreciate a second opinion on my calcs, attached in photos. Many thanks in advance.
  9. T

    Troubleshooting on a star delta starter

    I've got a call about a pump that is not working. It was a 30 kw motor with a star delta starter. The motor start but before it changes to delta it trips. And it look like the motor is single phasing. So i disconnect both cables at the motor and start it again. As soon as the delta contactor...
  10. M

    Capacitor Issues

    I have a Hayward pool pump where the start cap is 161-193 uf. How can you have a range of capacitance. Hayward is an american company. so maybe it can run on 110v or 240v. (just a guess). The other issue is ceiling fan caps, now these are start/run caps and I know from past experience that you...
  11. P

    Commercial EICR typical rates

    Just wondering what the approximate cost would be for getting a EICR done on a 3-phase setup? Small building, around 15 circuits but most single phase finals, only 3 I think are 3-phase loads.
  12. D

    Whats causing a voltage increase on a water pump?

    Hello. I'm doing a favour for a farm friend, they have a water pump down a bore hole thats been slowing down recently. The single phase 0.55KW motor is situated 40m down the well and the controls are at the distribution boards. The voltage going to the single phase motor is reading L-E 247 &...
  13. bigspark17

    Help needed with commercial kitchen food order printer

    problem is this printer has the plug on the end As seen in pic. Has anyone been able to extend this cable using cat5e or use an adaptor of some kind. I have aspare cat5e nearby i can use, otherwise running a wire will be a nightmare in a newly refurbished property. Ps the other end of the lead...
  14. J

    EICR on commercial unit

    Hi all Doing an EICR on a commercial unit. Last time done was 2002. No rcd protection whatsoever and plastic board. All circuitry testing out fine, complete ring, c.p.c's present at all lighting points and other appliances. One thing am unsure on is how to code lack of rcd protection on...
  15. P

    Is there any regulations for basket?

    Hello people, I'm writing up my NVQ portfolio and have covered the cables required and all the containment except for basket. I need to refer to BS7671 but cannot find a regulation for basket... any help would be appreciated. Thanks
  16. M

    Convert 3 phase into 3 single phases

    Hi there, I have currently started working on a farm and they are having a new 100a 3 phase supply installed. This is being terminated in an external enclosure. They then want to carry this 3 phase 150 meters to a barn and at this point split it into 3 single phase supplies. Is this even...
  17. P

    240V SP Ind Fan Motor wiring help

    Hi guys, struggling with a problem wondered if anyone can help. Had 2 A/C units failed on me, spare parts not available til end of August... :-( The faults were caused by the fan units which vapourised tracks on the PCB, great design , not. I can repair the PCBs but the fans are dual fans...
  18. B

    Price per metre for 100mm tray

    I have to price a job, first large scale job and looking for a rough price per metre you would charge to install, didn't know if there was a standard/average price please I know for sockets and lighting but this is new to price Thanks in advance
  19. B

    Mains supply for light industrial units.

    Hi guys. I’ve just take over a job that had been already started. It’s 7 light industrial units that have supplies already wired underground in 25mm 4 core. The client wants 7 meters at the mains which is all well and good but the question is.... The previous spark said he was going to put a...
  20. T

    I Need Work Looking for work as Mate in/around Coventry/West Mids. Trying to get started in commercial.

    Hi, Currently studying C&G 2365 Diploma Level 3 & 18th Ed (on hold due to Covid19 situation, one week left), looking to get into commercial jobs as a mate. Ideal location in and around Coventry and Warwickshire/West Midlands. Have been working with a local domestic electrician since Sept 2019...

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