Are the graphs for type B MCBs as shown on the TLC site http://www.tlc-direct.co.uk/Figures/3.18b.gif from 'Electricians guide ..16th Ed' by Whitfield, correct ?
Edit :- Just noticed no titles on graph. So :- Vertical axis = Time secs.
Horizontal axis = Prospective current , rms Amps.
Not a well printed graph but near enough !!
I am sure reading these topics that many of us diy persons are not really sure about the trip point of MCB or melt point of semi enclosed ( wire type ) fuses.
When not in a fault short situation, just a steady overload, of say 10% ... would it ever trip ?
Would it's performance (eventually) be degraded due to this overloading ?
I consider this to be an important general item which everyone using electricity, and perhaps being responsible for replacement of fuses of all household types, should be aware of ....
Not made too clear, gets clouded by 'fault' trip times and their closeness to 'instantaneous'.
P
Edit :- Just noticed no titles on graph. So :- Vertical axis = Time secs.
Horizontal axis = Prospective current , rms Amps.
Not a well printed graph but near enough !!
I am sure reading these topics that many of us diy persons are not really sure about the trip point of MCB or melt point of semi enclosed ( wire type ) fuses.
When not in a fault short situation, just a steady overload, of say 10% ... would it ever trip ?
Would it's performance (eventually) be degraded due to this overloading ?
I consider this to be an important general item which everyone using electricity, and perhaps being responsible for replacement of fuses of all household types, should be aware of ....
Not made too clear, gets clouded by 'fault' trip times and their closeness to 'instantaneous'.
P