General > General Technical Chat
18k for damaged household cable
AVGresponding:
--- Quote from: coppice on May 16, 2023, 08:53:48 pm ---
--- Quote from: AVGresponding on May 16, 2023, 05:54:40 pm ---
--- Quote from: coppice on May 15, 2023, 07:25:17 pm ---
--- Quote from: tom66 on May 13, 2023, 09:31:51 am ---I don't get the "bringing up to code" thing. The invoice she showed had line items for plumbing, like checking the kitchen drains and the bathroom faucet. What would that have to do with the electrics? Even if you had to bring the whole panel up to code, I can't see it costing $18k. The cable repair should cost a tenth of that too. I think this poor woman got ripped off on the repair as well as by the negligent contractor. :-//
--- End quote ---
The kitchen drains and bathroom faucet are presumably included for the same reason they would be included in the UK - grounding.
--- End quote ---
Under current regs you just have to earth bond gas and water at the incomers, not taps/basins/sinks/drainers etc.
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When did they drop the requirement to go through the whole plumbing chain to ensure plastics are not interrupting the earth bond?
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Hmm, around the time of the 17th edition, with the introduction of mandatory RCDs in most domestic circumstances.
You also appear to be misunderstanding the purpose of the earth bonding; it's to prevent external influences introducing potential into extraneous conductive parts in fault conditions (ie a damaged mains cable in the road putting dangerous voltages on your gas or water pipework), it's not for protecting you from shock hazards due to internal wiring faults.
The 18th edition and amendments have further tightened requirements for RCD/RCBO in domestic installations; it's effectively no longer permitted to not fit them in new installs under any circumstances, as they decided the exceptions were being abused.
jmelson:
--- Quote from: Gyro on May 15, 2023, 07:11:52 pm ---It's curious that code requires that the service must be upgraded to 200A. Surely as long as the service fuse is
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Well, the secondary breaker in the current crop of transformers may only be available in 200A rating, so everything downstream needs to be able to handle that current. Generally, the only protector between the transformer and the main breaker in the panel is in the transformer, and if there is a fault in between those, the results could be pretty spectacular.
Jon
james_s:
--- Quote from: jmelson on May 18, 2023, 02:35:25 am ---
--- Quote from: Gyro on May 15, 2023, 07:11:52 pm ---It's curious that code requires that the service must be upgraded to 200A. Surely as long as the service fuse is
--- End quote ---
Well, the secondary breaker in the current crop of transformers may only be available in 200A rating, so everything downstream needs to be able to handle that current. Generally, the only protector between the transformer and the main breaker in the panel is in the transformer, and if there is a fault in between those, the results could be pretty spectacular.
Jon
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Secondary breaker? Don't the transformers just have a fuse on the primary? The pole mounted sort do, I've never looked inside one of the pad mounted kind that feeds my house. One transformer normally feeds several houses so it will be fused considerably higher than what is needed to supply 200A.
Homer J Simpson:
--- Quote from: james_s on May 18, 2023, 04:05:06 am ---
--- Quote from: jmelson on May 18, 2023, 02:35:25 am ---
--- Quote from: Gyro on May 15, 2023, 07:11:52 pm ---It's curious that code requires that the service must be upgraded to 200A. Surely as long as the service fuse is
--- End quote ---
Well, the secondary breaker in the current crop of transformers may only be available in 200A rating, so everything downstream needs to be able to handle that current. Generally, the only protector between the transformer and the main breaker in the panel is in the transformer, and if there is a fault in between those, the results could be pretty spectacular.
Jon
--- End quote ---
Secondary breaker? Don't the transformers just have a fuse on the primary? The pole mounted sort do, I've never looked inside one of the pad mounted kind that feeds my house. One transformer normally feeds several houses so it will be fused considerably higher than what is needed to supply 200A.
--- End quote ---
johansen:
There is a lot of selective code interpretation.
The trenching at 22.5$ a foot is cheaper than where i live.
Conduit is overpriced by 10 fold as others pointed out.
And so is the 4/0aluminum... Which does not need to be in conduit anyways.
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