generators

[sparkx]

This is a boat and is outside the scope of BS7671 - think you need to consult a grown up.

As a previous poster has mentioned you need to have fault monitoring devices installed.

 

[Knobhead]

Until we know the precise method of “earthing” the generator neutral it’s like trying to plat fog.

Totally impossible.

You keep prevaricating around the questions, which leads me to think you’re in the mire over your head.

I’ll PM Durham

 

[DurhamSparky]

hehehe!! im in no position to give advice to the un advisable!

on a water based craft we had NO earth and tbh EFLI and RCD's we unheard of in the RN..!
yes we had a constant IR monitoring system checking for Earth Faults to the Hull of the ship..! our limit was under 600k ohms then we had to investigate, on a good day 999m ohms was achievable but seen as our MG sets used to eat carbon brushes for dinner it soon dropped rapidly! out come the Air guns and rags!! on completion it seemed like scene from marry poppins and the chimney sweeps..!


any way back to the point...! do you have a Neutral Earth TX at the generator? to assist with fault current when starting up and running etc..?

 

[Marvo]

You need a marine engineering consultant, this area is a minefield and there's many variables you need to consider before designing this kind of system. The system needs to consider safety of people on the barge as well as people not on the barge primarily but corrosion implications can cost astronomical amounts if not considered correctly.

I'm not an expert in this field but the marine projects I have been involved in have taught me you can't cut corners.

 

[DurhamSparky]

the RN cut corners!!???

 

[general error]

Hi again Robbie

The generator is likely to lose output voltage after half acycle when delivering fault current. personally would give greaterconsideration to this then I would to Zs’s.
Also. Residual current devices may become unreliable in saltladen air.
If you are going to get the blame for something badhappening it’s likely to be in connection with a job like this one so doconsider all the “what if’”s you can think of . first. Good luck.

 

[Marvo]

Also. Residual current devices may become unreliable in saltladen air.

I was assuming 'barge sits in the middle of a loch' meant freshwater.

 

[general error]

I was assuming 'barge sits in the middle of a loch' meant freshwater.

Probably but there are a few salt water inlets also named loch,Please would Robbie dip his finger in (with the generator locked off) & report back

 

[Marvo]

Probably but there are a few salt water inlets also named loch,Please would Robbie dip his finger in (with the generator locked off) & report back

Lol, the swearword filter doesn't like you talking about salt-water.

I'll stand to be corrected but it would certainly influence the installation method. Some more info on the generators would also be nice. This is still a job I would refer to someone more qualified for a spec to be issued.