Far too many TT installations out here in the sticks for my liking.
They just dont believe you when you say how much a CU costs!
TTC
They just dont believe you when you say how much a CU costs!
TTC
Trip times.
- Thread starter securespark
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123, are you more commercial & industrial?
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The plot thickens!
I have contacted several manufacturers who have all given me different time delays for their S type RCD's.
But Hager told me the British Standard 4293 actually states
"The device must not trip below 300ms, but must trip within 400ms."
This he says is based on the standard 200ms trip time maximum for the 1 x test.
50% of 200 is 100 + 200ms = 300ms
100% of 200 is 200 + 200ms = 400ms
I am thoroughly confused. If the calculation is based on the maximum 1 x trip time, why does the OSG say "rated time delay"??
Can anybody lay their hands on the relevant bits of BS4293?
Furthermore, if the relevant figures are indeed 300-400ms, then why have I got a whole series of figures for the time delay of RCD's from different manufacturers, from 50ms - 500ms??????
I have contacted several manufacturers who have all given me different time delays for their S type RCD's.
But Hager told me the British Standard 4293 actually states
"The device must not trip below 300ms, but must trip within 400ms."
This he says is based on the standard 200ms trip time maximum for the 1 x test.
50% of 200 is 100 + 200ms = 300ms
100% of 200 is 200 + 200ms = 400ms
I am thoroughly confused. If the calculation is based on the maximum 1 x trip time, why does the OSG say "rated time delay"??
Can anybody lay their hands on the relevant bits of BS4293?
Furthermore, if the relevant figures are indeed 300-400ms, then why have I got a whole series of figures for the time delay of RCD's from different manufacturers, from 50ms - 500ms??????
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