Industrial Electrical Installation For The Printing Industry

This is an example of our capabilities when it comes to Industrial Electrical Installation, the customer required two distribution boards, both with 250Amp three phase supplies, this ensured future proofing of the installation as the customer intends to install additional machinery at a later date. This turnkey project included, design of the complete installation, install and commission of 2 x Eaton Memshield MEM 3 12 Way Distribution boards, both rated at 250Amps.

 

      Installation 

  • Both distribution boards supplied with 5 core 50mm CSA SWA, wired in parallel to maintain and ensure a 250Amp, three phase supply at all times.
  • Heat shrink on all lugged terminations to ensure no short circuit and reduce the risk of electric shock.
  • Overhead containment installed in the form of ladder rack supporting the supply cables (4 x 50mm 5 core SWA's).
  • We fabricated a Unistrut 41x41mm frame behind the plasterboard wall to support the weight of the installation.
  • 7 x machine supplies, varying in size, the largest being a 63Amp three phase supply to a Digital Printing Press.
  • Wired 3 x new additional rooms, with dado trunking for power outlets and data points for site server access.
  • Mains connections were carried out at the weekend to not disrupt the business during their working hours.
  • All work tested and certificated without any issues.

 

 

Panel Fire In The Food Processing Industry

Here is an example of one of our call outs, this control panel supplied cooling fans on an adiabatic cooling tower. The customer got in contact after a small panel fire and not having the manpower to carry out the work in house.

      Highlighted Issues

  • Poor termination of ring crimps, in this case incredibly loose.
  • Bunched cables in trunking.
  • Circuit breakers on the limit of their current carrying capacity.
  • Little to no air movement in the panel due to crammed in circuit breakers and faulty air circulation fan, thus not allowing the circuit breakers to cool down.
  • This resulted in a small panel fire, this highlights the dangers of poor craftmanship when it comes to industrial electrics.

      Solution

  • Re-wired panel mains power supplying the circuit breakers with 4mm CSA tri rated cable.
  • Uprated circuit breakers supplying the fans with a higher current carrying capacity, this reduces load on the breakers and reduces the heat in the panel.
  • Spaced circuit breakers out to allow more movement of air. 
  • General tidy up of the panel wiring.
  • Replaced faulty panel air circulation fan and installed new filters to allow more air movement.
  • All completed within 24 hours of initial contact with National Electric & Engineering Ltd.

 

 

 

Gearbox Oil Seal Replacement 

This is a nice example of our capabilities when it comes to Mechanical Engineering, this gearbox drives a large Mechanical screw press, it had various oil leaks due to the ingress of rapeseed from a conveyor located above. There were 2 x air vents on the top of the gearbox that allowed for heat dissipation, being perforated plates, they were good at dissipating heat, but not very good at preventing the ingress of contaminants, in this case, rapeseed.

     Highlighted Issues

  • Ingress of rapeseed due to the location of perforated heat dissipation plates, directly beneath a conveyor transporting seed to the press.
  • Rapeseed being abrasive, this had worked it's way through the oil seals and eventually into the gearbox.
  • Press leaking oil causing the site maintenance team to top the oil up and constantly take oil samples for analysis.

     Solution 

  • Arranged suitable time with the customer to stop the press.
  • Disengaged the drive motors from the gearbox and removed all couplings and drained the gearbox of oil.
  • Thoroughly cleaned the drive side of the gearbox to remove all contaminants.
  • Replaced all five oil seals with OEM seals.
  • Adapted the heat dissipation plate with angled vents to stop any further ingress of rapeseed/contaminants. 
  • Re-assembled the gearbox, couplings, motors and filled with fresh OEM Oil.
  • Press back online without any further issues.