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Soulsurfer said:
Thanks DCF, was just a bit wary of cable to the heater as its rear of chip shop prep area. Unit said can handle the 10mm csa max though so that's cool, also running 4 or 5 core armoured.
Click to expand...

The terminal capacity of the unit is irrelevant to the size of the SWA as that will terminate into the isolator, not the heater.
The heater will just have the HOFR flex into it won't it?
Why would you want 5 core, or 4 core even?
 
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Soulsurfer said:
Electrical
The heater must be earthed and connected to the mains supply through an isolation switch having contact separation of at least 3mm in all poles and protected by a suitably rated RCD. Requires three phase supply. Installation must be in accordance with current IEE regulations.
[ElectriciansForums.net] 3 phase water heater
Please note that this unit requires a 400v three phase electrical supply.

Maybe IET not IEE !
Click to expand...

Well it doesn't say that in the manual you linked to above! And the mention of 400V is only for the maximum power rating according to that same manual, the lower ratings are suitable for the UK voltage.
 
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I hadn't said the link from spatec indicated Rcd use ! I can't remember where it was but possibly from the plumbers Zip paperwork spec but definitely there all the same, Jersey is on 415V anyway so fine for the full load of set that high. Other passage was from another seller called Aquahot.co.uk but essentially same as zip advice although I agree that the zip spec is a bit hit and miss as in the product guide I have too it had misprinted the range of voltage as 280-415 3/PE ! Oops. The heating system is listed as bare-wire system. Finally was going with 4/5 core as to be future proof and also to have an integrated Cpc inside armour rather than rely on steel even though will be made off correctly and linked as have seen corroded steel armour as Cpc and it is in a hot area near water basins. Haven't thought of isolator outgoing cable to heater as thought flex or similar inappropriate in the environment.
 
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Soulsurfer said:
I hadn't said the link from spatec indicated Rcd use ! I can't remember where it was but possibly from the plumbers Zip paperwork spec but definitely there all the same, Jersey is on 415V anyway so fine for the full load of set that high. Other passage was from another seller called Aquahot.co.uk but essentially same as zip advice although I agree that the zip spec is a bit hit and miss as in the product guide I have too it had misprinted the range of voltage as 280-415 3/PE ! Oops. The heating system is listed as bare-wire system. Finally was going with 4/5 core as to be future proof and also to have an integrated Cpc inside armour rather than rely on steel even though will be made off correctly and linked as have seen corroded steel armour as Cpc and it is in a hot area near water basins. Haven't thought of isolator outgoing cable to heater as thought flex or similar inappropriate in the environment.
Click to expand...

How will it be 'future proof'? What else could possibly be used there in the future other than maybe a replacement water heater?

If the armour is not suitably protected against corrosion then your installation is non-compliant. If the armour rusts then the cable is no longer fit for service no needs to be replaced regardless of how many additional cpcs there are.

If an HOFR flex is inappropriate then PVC sheathed SWA is also going to be inappropriate to the environment, if not more so!
 
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Soulsurfer said:
Electrical
The heater must be earthed and connected to the mains supply through an isolation switch having contact separation of at least 3mm in all poles and protected by a suitably rated RCD. Requires three phase supply. Installation must be in accordance with current IEE regulations.
[ElectriciansForums.net] 3 phase water heater
Please note that this unit requires a 400v three phase electrical supply.

Maybe IET not IEE !
Click to expand...

What's a 'suitably rated RCD'?.......30....100....300ma?
Bit ambiguous at best.
 
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That doesn't tell you what type or rating of RCD should be fitted, so is a completely useless statement really.
They don't even tell you what protection the RCD should be providing.


Sent from my iPad using Tapatalk
 
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