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Topic Title: 543.7 Equipment with with high protective conductor currents & BS 60309-2 plugs
Topic Summary: Is a plug/socket to BS 60309-2 the only type I can use?
Created On: 20 June 2013 10:41 AM
Status: Post and Reply
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 20 June 2013 10:41 AM
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chrisbrown1977

Posts: 3
Joined: 09 May 2011

BS7671, 543.7.101 states equipment having protective conductor current >3.5mA must be permanently connected, or with a plug/socket to BS EN 60309-2

Is this the only type of plug/socket I can use or can i use other industrial type connectors, for eg a Harting Han HSB? [spec for this is quoted as EN 61984]

Thanks in advance
Chris
 20 June 2013 12:58 PM
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AJJewsbury

Posts: 11686
Joined: 13 August 2003

BS 7671 specifically says BS EN 60309-2, so using a plug/socket that didn't comply with that would be a departure from BS 7671.

That said, you are permitted departures provided you can show that safety isn't compromised and it's noted on the certificate (see reg 120.3).

It would be interesting to get to the bottom of why BS 7671 stipulates BS EN 60309 devices - I've inherited one setup where a set of IT racks were supplied from multiple BS 1363 plugs/sockets - and there doesn't seem to be an obvious problem with that. I have wondered if it's based on a CENELEC/European requirement and been influenced by traditional continental practice where domestic sockets are sometimes unearthed in "dry" rooms but will accept plugs for class 1 appliances.

- Andy.
 21 June 2013 08:39 AM
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chrisbrown1977

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Joined: 09 May 2011

The 60309-2 plug/socket makes sure the PE connector is made first and broken last, but other types of plug/socket are also available that can do that.

Chris
 21 June 2013 05:22 PM
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intrinsic4225B

Posts: 1626
Joined: 30 September 2004

Originally posted by: chrisbrown1977

. . . makes sure the PE connector is made first and broken last, but other types of plug/socket are also available that can do that.



A plug complying with BS 1363 will do that - the earth pin being longer than the phase and neutral pins.

This should be the case with any properly designed plug and socket system intended for use with Class I equipment.
 22 June 2013 11:41 PM
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gkenyon

Posts: 4480
Joined: 06 May 2002

This is in line with BS EN60950-1, which says the same thing ("pluggable equipment, Type B").

A single "domestic" product with BS1363 plug should not exhibit such a high protective conductor current, so there should be no problem.

-------------------------
Eur Ing Graham Kenyon CEng MIET TechIOSH
 23 June 2013 09:26 PM
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AJJewsbury

Posts: 11686
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A single "domestic" product with BS1363 plug should not exhibit such a high protective conductor current, so there should be no problem.

.. at least until someone invents a daisy-chainable 4-way extension lead....

- Andy.
 24 June 2013 12:37 AM
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gkenyon

Posts: 4480
Joined: 06 May 2002

Originally posted by: AJJewsbury

A single "domestic" product with BS1363 plug should not exhibit such a high protective conductor current, so there should be no problem.


.. at least until someone invents a daisy-chainable 4-way extension lead.... [IMG][/IMG]



- Andy.
Hence "single" specified in my post, plus these days we can continue the discussion based on the fact that rarely in a new domestic installation will we see the outlets without 30 mA RCD protection.

-------------------------
Eur Ing Graham Kenyon CEng MIET TechIOSH
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