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110V Extension Reels

PATGuard 3 Forum

Re: 110V Extension Reels

Postby Richard Williams » Fri Apr 01, 2011 11:31 am

Hi Derek

The live and neutral are shorted out to allow for a successful insulation test without giving the option to use it as an extension lead.

This however, should not affect the earth bond test as there should be earth continuity all the way through.

I have just done a similar test with my components to double check nothing silly was happening.

It could be an earth fault with your lead. To check your side could you tell me what components you are using please?

If you would like to have a chat about it, please call me on 0191 5863511.
Richard Williams

Re: 110V Extension Reels

Postby Richard Williams » Fri Apr 01, 2011 11:52 am

Hi Derek

On another thought, did you create the sequence yourself?

If you did, did you choose IEC Lead Continuity OR Earth Continuity?

IEC Lead Continuity looks for the IEC lead connection whereas the Earth Continuity looks for the earth bond lead. Therefore, if you check an IEC lead with the earth continuity option it will be open circuit everytime.

Let me know how you get on.
Richard Williams

Re: 110V Extension Reels

Postby Derek » Tue Apr 12, 2011 9:23 am

Hi Richard

Having further looked at my test sequences I may have....OK i did try and do an earth continuity test on it hence it was failing.

My new sequence is (110V extension lead 15M)

Visual Test
IEC Lead Continuity Limit=0.30
Insulation (500V) Limit = 1.00

On this it passes does this all look OK or should I be incorporating any other test.

I did have IEC Lead wiring in the test as well but took that out because it kept coming up with an open Live.

Any help would be appreciated .


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Re: 110V Extension Reels

Postby Richard Williams » Tue Apr 12, 2011 10:18 am

Hi Derek

It seems that the sequence you have chosen is good. As long as the earth bond calculation is correct.

The polarity check needs to be carried out visually in this case as the live is not connected in the adaptor. This is for safety reasons to prevent 110v equipment being powered by 240v supply.

In the 240v test sequence, I would advise that polarity is checked.

Hope this helps..
Richard Williams

Re: 110V Extension Reels

Postby Duff1 » Wed May 04, 2011 2:16 pm

Hi Derek,

The Seaward 110v adaptor does have the 110v Line (miss called live) connected to the neutral of the 13A plug. This prevents 110v equipment being connected to 230v mains whilst still allowing insulation testing to be carried out. However, as you have discovered, it prevents lead continuity/polarity tests.

I use an appropriately lablled straight connected adaptor so I can run lead tests.

Duff 1
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Joined: Wed May 04, 2011 12:56 pm

Re: 110V Extension Reels

Postby PATconstructive » Fri Jun 03, 2011 10:39 am

110v extension cables will normally be 3 core cable with wiring to all three pins L N and E at both ends. The tests involved would be visual, earth bond test at 25A, insulation test at 500v and polarity check. I dont know about the PT300 but on the supernova you plug one end of the lead directly into the tester and the other end into the IEC port via an adapter lead. Your earth bond pass limit will obviously vary dependent upon cable CSA and lead length.

To clarify I made up my own 110V cee-form to IEC adaptor which is marked up only for use as a specialist test adaptor.
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Joined: Fri Jun 03, 2011 9:36 am


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