View the thread, titled "HELP! This is doing my HEAD IN!" which is posted in Electrical Wiring, Theories and Regulations on Electricians Forums.

Can someone please tell me WHERE in the regulations I can find where it says that cable connected to busbars operating in higher than normal temperatures must have its insulation replaced with heat resistant insulation. I have been scanning for over an hour now and my temple is throbbing.

`cheeers all.
 
alli can say is that the cable should be rated at the temp.it will be subjected to. this rating includes the insulation.
 
what are the 'normal' operating temperatures? 70/90 degrees? What insulation would you replace with in the circumstance? This is a bit outside of my day-today remit
 
can't imagine striiping insulation to replace with higher temp.insulation
 
you're not sad. I am. looking through the BRB for 2 hours on a sunny afternoon! I got a PM from a helpful member and I'll post here now my response.


cheers fella. However, a question still remains about practical application of such a regulation. How would you know that the bus bar is operating at higher than normal temperature? What is a 'normal' temperature? is it measured or does it come as an advisory in the specification or from the manufacturer? Would you install HR cable for the whole circuit, or strip back and re-insulate? Actually thats 4 questions. Thanks a million, now feed me with your expertise and experience.
 
im doing a shutdown on wednesday night, and ive got to tap off busbar, with 35m tri-rated tails, and the engineer has made no mention of bar temeprature to me, so it will be lug and hellaman sleeve only.
 
My interpretation of this reg is if you knew or measured the temp of the dis board and it was let's say 100C and your using 70C t&e you would have to provide protection against heat just like in any part if a cable run. If the high temp was only in the dis board I would only use heat resistant cable for that section so yes I would do what your thinking. Is this an exam question or for site?
 
exam question, but you never know. By what you're saying, you would have to make a connection in a JB from just outside the bus bar chamber? see my point now? Not exactly desirable to add a whole series of joints to enter the chamber.
 
and what's tri-rated cable? Seem to remember it is rated in three countries. Used to think it was SY. So far I have worked with twin and earth (grey and lsf) swa, singles, pyro, Fp200, FP 400 and SY. Any info on Tri-rated welcomed.
 
I remember chatting with my NIC inspector about this a couple of years back.

His take on it was where you have a crimped lugged connection onto a busbar, instead of stripping back enough outer PVC insulation to make the crimped connection strip back around 3-4 inches and re-tape it with insulating tape of the correct colour for L1 or L2 etc.
 
Trirated Cable, is a high temperature, flame retardant electrical cable designed for use in panel building. Trirated Cable is often referred to more generally as Panel Wire or BS6231 Cable.[1]
Trirated Cable is so called because it meets the requirements of three different international standards: BS6231[2], UL (or Underwriters Laboratories)[3], and CSA (Canadian Standards Association).[4] Combining three international standards in one product, makes Trirated Cable suitable for use in equipment required to meet both North American and European wiring regulations.[5]
This single core cable is described as ‘high temperature cable’ because of the high temperatures to which it is subjected during the manufacturing process. According to the UL standard, the maximum operating temperature of Trirated Cable is 105°C. This refers, however, to operating temperature for a specific length of time. The British Standard BS6231 states that the cable should have a maximum operating temperature of 90°C for continuous use.[6]
Voltage rating is another area over which the different standards vary. UL[7] and CSA[8] give Trirated Cable a voltage rating of 600V, whilst it is rated at 1000V in the BS6231 standard.

copied from wikipedia

with reagrds to your statement lenny, can you imagine looking at a chamber that is 10 years old, with the tape peeling away because of the heat? ive never used heat resistant tape, and have never seen others do it either. i strip back enough insulation for the lug, crimp it on, and use hellamans or heat shrink on the crimped part of the lug
 
It's RAF in my opinion and I've never done it that way, just offering another view is all.

Heatshrink makes for a far neater job IMO.
 

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