Underground cable to new house (HDPE+NYY)

[MJCM]

Guys,

 

I was reading this topic and specifically this post

 

There it says. (Translation from the Thai Text)

 

Quote

Remark - Copper cable must put in PVC pipe using separate cables underground use NYY only.

 

Would this mean for our 15/45 Meter which we are going to connect to the house using NYY, that I would have to run 2xHDPE from the Meter to the House or is one enough?

 

Thx in advance

[bankruatsteve]

Just one.  If you have not yet contacted your PEA, be sure to do so for the point at which you intend to go underground.  Most PEA do not allow under roads, easements, and the like.  Once on your land, up to you.

[MJCM]

Thx Perfect.

 

Will contact them before we lay the HDPE.

 

Thx again, really appreciated.

 

 

 

 

[Crossy]

Yeah ^^^. My understanding is one pipe but separate single-core NYY for each phase and neutral.

 

Bus as above, talk to your local PEA before you do anything.

 

[MJCM]

It would be a 2x16 NYY to connect the house to the Meter, that is the recommendation of the Sparky.

[Crossy]

1 minute ago, MJCM said:

It would be a 2x16 NYY to connect the house to the Meter, that is the recommendation of the Sparky.

 

How far is it from meter to house?

 

A 2x16 does NOT meet the requirement of separate cables, do verify that your local PEA will accept.

 

 

 

[bankruatsteve]

@Crossy what do you think the logic is for needing separate cables?  (vs. 2x)  Esp. in NYY.

[MJCM]

 

8 minutes ago, Crossy said:

 

How far is it from meter to house?

 

A 2x16 does NOT meet the requirement of separate cables, do verify that your local PEA will accept.

 

Approx 60-70 Meters from the meter to the house.

 

Will do, will verify about the 2x16 and the HDPE location

 

Thx

 

Edit: I found this one online: http://sirichaielectric.com/product_in/สายไฟ-NYY-2x16-ยาซากิ

[Crossy]

2 minutes ago, bankruatsteve said:

@Crossy what do you think the logic is for needing separate cables?  (vs. 2x)  Esp. in NYY.

 

No idea, but when did logic apply in Thailand?

 

If you want a permanent supply you do what your local supply authority want.

 

[Crossy]

2 minutes ago, MJCM said:

 

Approx 60-70 Meters from the meter to the house.

 

Will do, will verify about the 2x16 and the HDPE location

 

Thx

 

Purely on a volt-drop front I would be tempted to go to 25mm² if budget allows.

 

[MJCM]

1 minute ago, Crossy said:

 

Purely on a volt-drop front I would be tempted to go to 25mm² if budget allows.

 

Oke and then in a 40 HDPE? I was thinking about the 32 HDPE for the 16.

 

Correct?

[Crossy]

3 minutes ago, MJCM said:

Oke and then in a 40 HDPE? I was thinking about the 32 HDPE for the 16.

 

Correct?

 

Single NYY in 25mm² is 14.5mm in diameter overall and you need to get two down the tube.

 

If reasonably straight 40mm ID tube should be OK, go bigger rather than smaller ????

 

 

[MJCM]

Yeah

1 minute ago, Crossy said:

 

Single NYY in 25mm² is 14.5mm in diameter overall and you need to get two down the tube.

 

If reasonably straight 40mm ID tube should be OK, go bigger rather than smaller ????

 

 

Yeah you are right, in the other thread it already said it was difficult to pull NYY through the tube, and with 25mm² it would way harder and also I will (I think) need (1 or 2) 90 degree bends, which will make it even harder ????

 

Thx guys, really helpful, really appreciated

 

Will update when I have news from our local PEA.

[Crossy]

A 25mm² x 2 NYY is the best part of an INCH in diameter, that's going to be a wrestle to get into your tube.

 

The 2 x single core version would be more manageable.

 

Either way your man will need specialist pulling kit.

[Curt1591]

When digging in my yard, trying to find where a drain pipe was blocked, I found that it was buried about a meter down and simply stubbed off. They never got around to hooking it up to the rest of the drainage system

However, about 30 centimeters down we came across the main electric feed. Glad I wasn't using a pickaxe !!

Is there a Thai word for "code"? If so, how much does it cost to get a pass?

[bankruatsteve]

The conduit should be installed with pull rope and with that size cable, no 90's.  Use two 45's instead. 

 

And, IMO pulling one 2x seems a lot easier than two singles. 

 

Which reminds me of how upcountry Thai's do a right turn. It's never 90.  Two 45s, three 30s,or in many cases cross the road and THEN do a 90 into the wrong lane. Just had to throw that in. ????

[MJCM]

15 minutes ago, bankruatsteve said:

The conduit should be installed with pull rope and with that size cable, no 90's.  Use two 45's instead. 

 

And, IMO pulling one 2x seems a lot easier than two singles. 

 

Thx yeah will use 2x25mm² instead 1x25mm²x2 ????

 

Top Tip about the 45's, will have a look if 45's are available in 50mm, never seen them though to be honest, but will check.

[MJCM]

Guys,

 

would it be allowed to lay the NYY in 13.5(grade) PVC Pipe?

 

Way more expensive then HDPE over a 60-70 meter run, but a lot easier to handle and to lay.

 

Allowed/Disadvantages????

 

Disadvantage 1 = Degrades faster then PE if buried under ground? Correct?

Disadvantage2 = Make a mistake throw a way the lot ????

[MJCM]

24 minutes ago, bankruatsteve said:

Which reminds me of how upcountry Thai's do a right turn. It's never 90.  Two 45s, three 30s,or in many cases cross the road and THEN do a 90 into the wrong lane. Just had to throw that in. ????

55555

[sometimewoodworker]

4 hours ago, MJCM said:

Guys,

 

would it be allowed to lay the NYY in 13.5(grade) PVC Pipe?

 

Way more expensive then HDPE over a 60-70 meter run, but a lot easier to handle and to lay.

 

Allowed/Disadvantages????

 

Disadvantage 1 = Degrades faster then PE if buried under ground? Correct?

Disadvantage2 = Make a mistake throw a way the lot ????

You have an almost absolute guarantee that if you use PVC it will fill with water and unless there is a crushing risk why use 13.5? It will not degrade underground it’s the UV that does that.

[Crossy]

On the PVC pipe, again check with PEA. 

 

HDPE with a red (for electric) tracer is the preferred stuff, leave it in the sun for a few hours before unrolling and it's manageable, even so it's not going to be a solo job.

 

If you decide to use two wires rather than a twin pull them both in together and pull another pull rope through with them. 

[canopy]

On 1/29/2020 at 5:25 PM, Curt1591 said:

Is there a Thai word for "code"? If so, how much does it cost to get a pass?

As of not so long ago new houses need to pass electrical inspections before getting a permanent meter. Also houses that had the meter disconnected are inspected before they allow the meter to be reconnected. I would imagine they would tell you in detail what they look for if you were to ask them. Basics are things like no 2 prong outlets, sufficient ground, rcbo breakers.

 

[Curt1591]

44 minutes ago, canopy said:

As of not so long ago new houses need to pass electrical inspections before getting a permanent meter. Also houses that had the meter disconnected are inspected before they allow the meter to be reconnected. I would imagine they would tell you in detail what they look for if you were to ask them. Basics are things like no 2 prong outlets, sufficient ground, rcbo breakers.

 

Then, the second part to my question, how much does it cost to get a pass?

[canopy]

The cost of inspection is built into the cost of the meter.

 

[sometimewoodworker]

1 hour ago, Curt1591 said:

Then, the second part to my question, how much does it cost to get a pass?

If you are not being sensible and actually installing a safe system (it really isn’t difficult to be safe) then a suitable brown envelope will get you connected and the cost is “up to you”

 

There is no fee for the inspection. If you have the basic RCCB, earth rod, (usually)MEN link, earthed power sockets, and a sensible incoming breaker you will pass.

[Crossy]

3 hours ago, Curt1591 said:

Then, the second part to my question, how much does it cost to get a pass?

 

In reality the inspection is pretty cursory, to fail it would have to be really unsafe.

 

Ours took 30 minutes and consisted of the man looking inside the distribution box, looking at the top of our ground rod and then spending 25 minutes gassing with Madam whilst drinking coffee and eating cake.

 

Ensure that:-

You have at least a front-end RCD.

You have 3-pin outlets.

You have a ground rod.

You have MEN implemented in the Thai manner.

Your main breaker is sized appropriately for the meter.

 

[Curt1591]

Judging that I live in a moo baan with doctors and other professionals, and the only one that drives a Benz is a land department employee, I am surprised that anyone even needs to visit the building site. Maybe you needed a bigger envelope ...

[Crossy]

1 hour ago, Curt1591 said:

Judging that I live in a moo baan with doctors and other professionals, and the only one that drives a Benz is a land department employee, I am surprised that anyone even needs to visit the building site. Maybe you needed a bigger envelope ...

 

It's not the land department that does the electrical inspection.

 

[shaemus]

NYY Is not rated. For underground. 

 

If you buy it then make sure its copper as THW A is aluminium. 

 

Hdpe is perfectly. Adequate for UG services. You can buy it from Global House in a varity of wall thickness's. 

 

32mm dia will be suitable. 

 

Sweeping bends are what you need which require deeper excavation if using a thicker wall thickness

 

Bring out your conduit so it is next to the wall under your consumer unit so no extra containment is needed ans yoi can use saddles to fasten to the wall. 

 

Pay attention to how baxkfill your trench. I used a stabilised soil which i made with the soil that came out water and a concrete vibrator to make the slurry, which i then let dry and placed prefabricated concrete sections (50mm) over where cars and trucks would be driving over. I have had 20 ton excavators drive over witb no dramas. I also installed water pipe and extras for fibre optical cables and cat 6 for future cameras at the. Same. Time. 

 

Pm. Me if you need advice or help

 

Shaemus (sparkie) 

[Metropolitian]

14 hours ago, canopy said:

The cost of inspection is built into the cost of the meter.

 

15 hours ago, Curt1591 said:

Then, the second part to my question, how much does it cost to get a pass?

 

These two costs are separated.

The inspection is now customarily done when installing the meter and included with the service charge, which is 700thb.

The cost for the meter is variable and merely an deposit, for 5(15) it is 300thb and 15(45) 2000thb , 30(100) 4000thb and so on.

You can claim the deposit back when you sold the place.

 

(Prices are MEA)