Recent content by DavidMartin

Ive had this 

We have customers who charge us a percentage ( deducted off invoices) for the privilege to be on their approved contractors list and also for early settlement. We are notified of these  beforehand so,we add them on the quote, plus a little bit 

I'm assuming no one has noticed that a Lazy Spa is Class 2 http://www.lay-z-spa.co.uk/product/4/bw54112-2013-lay-z-spa-vegas-hot-tub

Can remember the good old days when we got 68p a kilo for bright wire  :God no:

As I said earlier there was no reason for it, it was simply the local electricity board stating that you needed to run a separate CPC with any swa 16mm and over. Like another myth which gets discussed on here occasionally we know it's not needed but most still install one 

The local electricity board

All I can vaguely remember was our contracts manager at the time stating that all swa supplies above 16mm had to have separate overlays run alongside, irrespective of what was written in the 14th / 15th edition of the regs or any other criteria. The local electricity board insisted on it and...

Eastern Electricity Board in the early 80's insisted on overlay cpc's on supplies connected to their network ie from a LV cubicle on their transformer

I'll see what I can dig out, the local electricity boards when were a law unto themselves started refusing to connect sub mains etc unless an overlay was installed alongside the supply cable. i used to have a table with the cable / armour info on relating to steel equivalent CPC size. It was...

Secondary CPC's or Overlays as they are commonly known are another belt and braces practice set by the DNO about 30 years ago. They weren't convinced that the steel armouring was capable of taking the fault current. There is only one cable that I've come across where this was possibly the case...

We use SY more and more because the majority of equipment is imported and not designed to have an armoured cable terminated into it. We are in the process of doing an installation at a multi million pound sawmill and its machinery is German. The German installers cannot believe we have...

Would you have the company name by any chance as we and all our cable suppliers could not source anything like what you have mentioned, be handy for future reference cheers

Also I'm assuming that the customer has a large enough supply coming in to handle the load This was the size specified by the designer. I also don't like using SWA and similar as trying to gland and connect them into the inverters is a nightmare. Unfortunately nobody does a screened cable of...

Spookily I have just done 2 x 399 kW refrigeration compressors on Danfoss VSD's backed up by 800amp MCCB's. These are cabled with 300 mm awa singles with a 150 mm overlay.

I've had issues with the grid switch screws also. Along with that we have a site where we have fitted MK Masterseal RCD sockets. We are constantly replacing them as going faulty. The area where we fitted Newlec ones we haven't had to replace any (touch wood)