1. haptism

    BS 1361 50A ZS

    Anyone know the ZS for an 1361 or BS 88-3 50A fuse. All the tables I find have n/a. I phoned the maker and was told there are no listed ZS' for a 50A and to take the difference between the next closest sizes (45A & 60), surley thats not proportional ?
  2. T

    software for mapping electrical (commercial) installation

    Anyone know of software to produce schematics of distribution boards and circuits plus sub mains etc.?
  3. P

    Volt drop question

    Hi everyone, I am intending on working in the uk shortly, i am from ireland and dont have the uk regs presently. I am trying to prepare for the exmas i will face and the cable calculations/volt drop calculations are something i cannot remember doing here in ireland in my college time so my...
  4. A

    Volt drop tables for LSF T&E

    Which table do you use in BS7671 for volt drop for LSF Twin and Earth? There does not appear to be a table for LSF cable. 4D5 refers to the grey PVC cable and is not the right one to use for the white LSF. Any help would be appreciated.
  5. R

    Onsite guide

    Hey guys i was looking at, the onsite guide and the tables with in it and I am finding them a little confusing to read/interperet. Can someone clarify this for me? Specifically table 7.1(i) the installation methods i can't seem to find them in the bs 7671 regs book, or they dont match up in both...
  6. O

    Confused by cable selection tables.

    Studying the Electricians and On Site Guide tables (for my Domestic Electricians course with OLCI) and the cable sizes all have double entries in the tables 4.1.1, 4.1.2, 4.1.3. That is the Cable csa for different circuits show 2.5/1.5, 6/2.5 etc. I understand the need for different csa for...
  7. S

    Bonding of commercial catering equipment

    Just wondering what your thoughts are on this, have seen it done in a variety of ways, and the lads at work all have different ways of doing it, e.g. daisy chain from main bond to the gas pipe around each piece of equipment, another way to put earth straps at various points along the gas...
  8. B

    Commercial kitchen bonding

    I cant work out what needs to be bonded in a commercial kitchen. Commercial kitchens have lots of free standing metal work tops & work benches, so do these need to be cross bonded and have a earth taken back to the DB? Also for the sinks in commercial kitchens do they need bonding? I cant seem...
  9. B

    Volt Drop

    This is a 2391 question DURING THE COURSE OF AN INSPECTION ONE OF THE SINGLE PHASE RADIALS supplying an item of fixed equipment is to be checked for volt drop. 45A full load, 80m length, 10mm singles,70 degree thermo singles, steel conduit, mohms/m at 20 degrees=1.83(p166 OSG)...
  10. G

    Bonding commercial kitchens

    I'm working in a new build school kitchen at the moment and am bonding. We have taken earths around all the pipework and fan canopys but what about stainless steel tables, shelving, etc? Would this need to be bonded? Also, tables and racks which are on wheels? Obviously being on wheels you'd...
  11. C

    Commercial kitchen bonding

    Hi any thoughts on this ? Doing a periodioc on a commercial property with a restaurant and kitchen.Lots of metal tables in the kitchen (not fixed) gas ovens,dishwashers etc. The circuits are rcd protected the main bonding to gas/water is ok There has been installed a 6.0mm earth cable running...
  12. A

    Commercial kitchen tables

    we have a site where in a school kitchen there is a stainless table with just a sandwich maker on it, we are being told enviro health officer said it wants bonding is this correct? the socket is rcd protected.
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