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Do-It-Yourself (DIY) Question & Answer Forum
External Oil Fired Central Heating Boilers
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<blockquote data-quote="Revved Up Sparky" data-source="post: 73046" data-attributes="member: 5050"><p>I have'nt wired one of these for a while. Any input gratefully received. Thanks !.</p><p></p><p>Main Equipotential Bonding</p><p></p><p>The incoming oil service never enters the house and the plastic lagged pipework is clipped on the surface from the oil storage tank a few metres away. Do you think I am right in thinking the oil service does not need a 10mm MEBC clamping onto it ?. The pipe is not buried therefore it cannot bring earth potential into the house via the heating pipework.</p><p></p><p>Isolation and Switching</p><p></p><p>If such a boiler is outside, does it always need an external isolator ?. I have'nt got the regs in front of me so I have'nt looked it up yet but I reckon it should have an external isolator for safe and accessible isolation with some copex going into the unit to provide mechanical protection to the load flex.</p><p></p><p>Three lives ?</p><p></p><p>This particular unit (a combi) seems (from manufacturers info) to need three lives !, a permanent live, then two switched lives for DHW and CH. I thought a permanent live for DHW and switched live for CH would suffice but it seems this unit has a small storage tank in it so I am thinking it needs the perm live to keep enough DHW hot for a few sinkfuls but the DHW live to call for more.</p></blockquote><p></p>
[QUOTE="Revved Up Sparky, post: 73046, member: 5050"] I have'nt wired one of these for a while. Any input gratefully received. Thanks !. Main Equipotential Bonding The incoming oil service never enters the house and the plastic lagged pipework is clipped on the surface from the oil storage tank a few metres away. Do you think I am right in thinking the oil service does not need a 10mm MEBC clamping onto it ?. The pipe is not buried therefore it cannot bring earth potential into the house via the heating pipework. Isolation and Switching If such a boiler is outside, does it always need an external isolator ?. I have'nt got the regs in front of me so I have'nt looked it up yet but I reckon it should have an external isolator for safe and accessible isolation with some copex going into the unit to provide mechanical protection to the load flex. Three lives ? This particular unit (a combi) seems (from manufacturers info) to need three lives !, a permanent live, then two switched lives for DHW and CH. I thought a permanent live for DHW and switched live for CH would suffice but it seems this unit has a small storage tank in it so I am thinking it needs the perm live to keep enough DHW hot for a few sinkfuls but the DHW live to call for more. [/QUOTE]
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External Oil Fired Central Heating Boilers
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