Please see the attached image. This is a fairlly big place. The main incomer and a big dist panel are right down the other end of building. A Panel (amomgst other things) near Reception is fed from Main panel. From this panel is a dist circuit feeding another building (Annex). There are 2 4 core SWA's to this building. The one i'm interested in is the one feeding the 'Power' CU and is fed in 35mm 4C. the other is Lighting and the SWA is slightly smaller, Maybe 25mm 4C but no marking on this cable that I can see.
I hear conflicting views on the Volt Drop allowed on PV. Way back when I did my qual I was told 1%. Later I was told 1% is only for DC All in 2%. Also read 3% all in. Anyways, DC Loss is minimal so worst case sticking to 1% allows up to about 60m on a 35mm 4C SWA from inverters (well a small DB at side).
The bit that is confusing me is: where do I consider the VD to?
Answers on a postcard
p.s. I was told also that there is a backup Genny for the place but could not access it as the caretaker had the keys and wasn't on site. How does this affect (if at all) PV systems?
Feel a bit of a noob but I'm not really a commercial guy. Will have a crack at owt though.........
I hear conflicting views on the Volt Drop allowed on PV. Way back when I did my qual I was told 1%. Later I was told 1% is only for DC All in 2%. Also read 3% all in. Anyways, DC Loss is minimal so worst case sticking to 1% allows up to about 60m on a 35mm 4C SWA from inverters (well a small DB at side).
The bit that is confusing me is: where do I consider the VD to?
- The Connection point. i.e the Annex DB
- All the way back to the Incomer?
Answers on a postcard
p.s. I was told also that there is a backup Genny for the place but could not access it as the caretaker had the keys and wasn't on site. How does this affect (if at all) PV systems?
Feel a bit of a noob but I'm not really a commercial guy. Will have a crack at owt though.........