Sorry no, but if anyones interested I have a form in word format I use to log test results. It saves messing up the proper forms.
Generator advice
- Thread starter ban-all-sheds
- Start date
Sorry no, but if anyones interested I have a form in word format I use to log test results. It saves messing up the proper forms.
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Are you supposed to switch the earth in the changeover switch, or have a rod permanently in parallel with the supply earth?Qedelec said:
The earth rod should idealy be switched as well but I would check with the REC.
What would be the implications if the spike was permanently connected. Better on a TT.
On a PME the spike would be the return path if Neutral failed.
What would be the implications if the spike was permanently connected. Better on a TT.
On a PME the spike would be the return path if Neutral failed.
TT: - No difference - same rod at all times, and nothing to do with the DNO
TN-C-S: - No difference? - just one more PE to add to the M already present?
TN-S: - Dunno. It's what I've got, of course....
TN-C-S: - No difference? - just one more PE to add to the M already present?
TN-S: - Dunno. It's what I've got, of course....
Which means a switch in the main earthing conductor, which I thought was a no-no?
They are busy and important people - I wouldn't want to trouble them....
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TN-S Hmmmmmm!
Whats the worse that can happen?
You lose your earth to the supplier -- you have an alternate earth via the spike.
You lose the neutral -- return path is via the sheath and the ground.
I'd go with permanently connected spike.
Whats the worse that can happen?
You lose your earth to the supplier -- you have an alternate earth via the spike.
You lose the neutral -- return path is via the sheath and the ground.
I'd go with permanently connected spike.
You can pay more if you want to: http://www.generators.co.uk/briggsstratton/generartors.php#bst9200mQedelec said:
I had been thinking that diesel would be better, but I've got no handy source of the red stuff, or of CH oil. If I was looking at a breakdown-of-civilisation scenario, the fuel versatility would be appealing, but they are more expensive, more noisy, and harder to start in cold weather, so I'm leaning towards petrol....
a rod in the ground isn't really any different from a pipe in the ground and you connect those to the suppliers earth all the time. So i really can't see any problem with having a rod permanently connected provided adequate cable is used.ban-all-sheds said:TN-S: - Dunno. It's what I've got, of course....
We fit commercial gensets, and a rod connected to the MET is essential. No point switching it. No point isolating the REC source earth when gen running either.
We usually use a tape, rather than a rod. A hard-drawn bare copper cable (70mm usually) is used.
We always fit diesel, but thats all you see in large sets. They all have a heater in the water coolent pipe work (makes odd sense!), which keeps the engine warm, and ready to fire.
Also, generally, we have them connected to a timer to start up for 30mins every week (on large sets). These sets are also connected to auto-changeover switches, and the generators locked away, with many warning notices......."This machinery is liable to start without warning!"
We usually use a tape, rather than a rod. A hard-drawn bare copper cable (70mm usually) is used.
We always fit diesel, but thats all you see in large sets. They all have a heater in the water coolent pipe work (makes odd sense!), which keeps the engine warm, and ready to fire.
Also, generally, we have them connected to a timer to start up for 30mins every week (on large sets). These sets are also connected to auto-changeover switches, and the generators locked away, with many warning notices......."This machinery is liable to start without warning!"
one thing i've often wondered is if gensets are ever configured to start and take over some of the load when power demand exceeds a certain level.
i'd think such a setup could for example be used if a site was having problems with overloading thier service occasionally but either couldn't justify the cost of an upgrade or couldn't get it soon enough.
i'd think such a setup could for example be used if a site was having problems with overloading thier service occasionally but either couldn't justify the cost of an upgrade or couldn't get it soon enough.
Wood.... trees.....plugwash said:a rod in the ground isn't really any different from a pipe in the ground and you connect those to the suppliers earth all the time. So i really can't see any problem with having a rod permanently connected provided adequate cable is used.ban-all-sheds said:TN-S: - Dunno. It's what I've got, of course....
Trees.... wood....
I'll get my coat.....
plugwash said:
One site we did ran the generator from 3pm to 3am, when all the refridgerated lorries where parked up, and plugged in (32amp 3ph each). The mains supply was just overloaded, and the timescale for replacement was months!!
Instead of one big c/o switch, how about feeding the ccts. you want backed up with spurs, and using a panel of small c/o switches, after the CU?
You would need to switch both live & neutral, and could feed the Genny in via it's own small CU with RCCD & MCB's. Genny frame "earth" would = existing supply earth?
My Genny is "floating neutral", and IMHO, thats what you want.
I've bonded "neutral" to earth at the supply side of the RCCD; house is TT.
I'me not sure if FN is normal for portables sold here, or whether non FN's are allowed under CE regs?
You would need to switch both live & neutral, and could feed the Genny in via it's own small CU with RCCD & MCB's. Genny frame "earth" would = existing supply earth?
My Genny is "floating neutral", and IMHO, thats what you want.
I've bonded "neutral" to earth at the supply side of the RCCD; house is TT.
I'me not sure if FN is normal for portables sold here, or whether non FN's are allowed under CE regs?
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