What overload protection is there upstream of incoming HRC Cutout?

[Lectrician]

Indeed (and I think a bit higher when there is electric heating) - and, when one thinks about it, that's not unreasonable as an average over time - 'large' loads (say, >1kW) are usually present for only a small proportion of the 24 hours of a day. However, I presume that there are times of day/year (like the infamous Christmas day morning!) when the average across properties might well get quite a bit higher than that.

Kind Regards, John

Substations and generators usually have a continuous and peak rating. For example, a site I maintain has a substation which clearly states something like 630amp continuous, 800amp for x hours.

 

[JohnW2]

Substations and generators usually have a continuous and peak rating. For example, a site I maintain has a substation which clearly states something like 630amp continuous, 800amp for x hours.

That makes complete sense - indeed, it's almost a necessity when one has loads which vary appreciably. As a matter of interest, do you know what rating of fuse that one would have?

Kind Regards, John

 

[Lectrician]

800amp ACB for sure.

 

[JohnW2]

800amp ACB for sure.

Thanks. I was wondering whether they were perhaps 'pushing' their protective device with the non-continuous design current - but I suppose that would be a little naughty!

Kind Regards, John