Recent content by RBE

as panelman says an door isolator would meet 463 01 01

Martinpirrie I may be wrong but I thought the IEE had banned the use of voltage opperated trips,

scotsparky I just wondered what your oppinion was on a site using both ie house Workshops & grainstore on PME. cow shed & stables on TT earth spike & Rcds the buildings are seperate so cross bonding isn,t a problem & water pipes are pvc.

Martinpirrie Thanks for the info. this backs up my own oppinion to use a TT system with Rcd protection. as opposed to connecting to the Recs Pme earth Based on the fact that it is less likely that stray current from other instalations can back feed onto the installation ok fault disconnection...

Hi I was not suggesting that the Rcd was faulty or incorrectly installed, if you go to www.reci.ie/newssept2000.htm Electrocution of cattle. you will understand me better.

it seems to be an area that no one can give a straight answer to The conclusion in the artical I refered to merely stated that the installer should have checked the rest of the sites installation even the there is no guarentee that it would have been prevented. RCD relays are a standard...

Hi Jbartos yes verry interesting sites But non have specific reference to my question as both earthing systems have their merits & both meet BS7671 requirements what Im asking is there any reccomended preference. given the incident I refered to. I personaly prefer pme. but how can back feed be...

HI Q Which would you say was the safest method of earthing a cow shed ie connect & bond to the supply PME earth terminal or use an earth rod & rcd making a TT installation. Ive Always Assumed that a properly bonded system was safe on PME. However Ive just been reading about an incident in...

HI Q Which would you say was the safest method of earthing a cow shed ie connect & bond to the supply PME earth terminal or use an earth rod & rcd making a TT installation. Ive Always Assumed that a properly bonded system was safe on PME. However Ive just been reading about an incident in...

Thanks jhadk verry helpfull

Hi I was going to ask if anyone new of any web site that would give me some info on field bus applications but with the responce that thryll got from xnuke I don,t think Ill bother. what is this the closed shop union ?

Hi djs can you reccomend any specific make of plc also as Im only contolling a valve speed is not a requirement.

Hi Im trying to control a multi turn valve/pressure reg I wondered if it were possible to use a stepper motor driven directly from a plc via relays if nessary the idea being I could program the plc to deliver the correct no of pulses for the required pressure output of the valve can a stepper...

busbar why four wires for the others it can be done with three ! or have I missed something ?

Q what is the best / correct method for loop testing ac motor circuits. ie I need to test some motors fed from an mcc control cabinet Ive had several suggestions sutch as link the contactor out disconnect at motor terminals & test back to panel another college says you must test with the...