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ericmark is Turkey here I come!

Profile Views:	4008 views
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Last Update:	2 months ago
Signup Date:	Jan. 27, 2008
Forum:	5,641 posts
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circuits
Updated 2 months ago

22 hours ago

ericmark was thanked by billywolfe for a post made in Electrics UK

RCD tripping on new Consumer Unit

2 days ago

ericmark thanked SimonH2 for a post made in Electrics UK

UPS and cordless phones.

2 days ago

ericmark posted a new forum topic in Electrics UK

UPS and cordless phones.

10 days ago

ericmark posted a new forum topic in Electrics UK

What is a new circuit under Part P regulations?

11 days ago

ericmark thanked Grizzly for a post made in Software

Moving Camcorder video to PC

11 days ago

ericmark was thanked by JamesEB for a post made in Electrics UK

Surge Protector with its own on/off switch

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Small Split in Twin and Eath Outer Sheath

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ericmark was thanked by BBinterS for a post made in Electrics UK

Small Split in Twin and Eath Outer Sheath

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Door Bell push button battery or mains?

13 days ago

ericmark thanked bernardgreen for a post made in Electrics UK

Door Bell push button battery or mains?

Name:	Eric
Gender:	Male
Country:	United Kingdom
Region:	Flintshire
Interests:	Amature Radio
Occupation:	Electrican

Website URL:	http://www.ericmark.talktalk.net
MSN Messenger:	gw7mgw@hotmail.com
Yahoo Messenger:	ericmarkpalmer@yahoo.co.uk
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Adam_151

bernardgreen

martinxxxxxx

bernardgreen - 8:55 AM on Mar. 29, 2013

reply | message

Hi TT earths ,

I accept the risk of a bouncing neutral is small but it does happen, We had 3, possibly 4, serious bounces in 20 years and several minor ones at my last house. In this cottage there is a measurable difference between the CPC and the stone walls. And that is on a neutral less than 800 yards long. The DNO insisted I take great care to ensure the CPC in my cottage could not make any connection with the CPC in the adjacent shop which is TT and was previously the source of electricity to the cottage. One of their concerns is where a PME earth is bonded to metallic supply pipes. The chaps connecting my supply were a bit more open with information, Broken neutrals have resulted in burnt out bond wires in meter boxes when the metal supply pipe has a near zero impedance to ground ( or direct to the neutral at the substation ). On one estate the water mains were modified to include an isolating section.

Regards

Bernard

bernardgreen - 10:37 PM on Jan. 8, 2012

reply | message

Hi Eric

The pain may be a result of a seasonal effect on the body. My medical contacts do include purely physical effects in their list of SAD related symptoms so JohnW2 is wrong to insist SAD only relates to psycological affects.

A colleague of mine in the 1980's suffered with skin problems in winter and after consultation with his GP he found relief by using a sun lamp for a few hours a week. The mechanism was that his vitamin D levels dropped very low due to lack of sunlight during winter. Synthetic vitamin D reduced the problems but not completely but (it seems) his own vitamin D was effective. That said it may have involved other processes that depended on sunlight to function.

Regards

Bernard

bernardgreen - 10:08 AM on Dec. 31, 2010

reply | message

Hi

I am not this posting on forum as it would be a dangerous thing for DIY people to hear. Tried to send it as message but it was rejected as we are "not friends"

Rings versus Radials and calculations. I recall from my connections with the London Fire Brigade that the majority of electrical ignited fires were from over loaded junction boxes or ones with loose terminals. That is my main reason for preferring rings with their single fault tolerance including for lighting. I have seen a few burnt out sockets on radials but few on rings. Those on rings were mostly cheap plugs over heating. One on a radial was on an seldom used socket next to the front door. Vibration from the door was probably the cause of the terminal working loose.

My connection with the Fire Brigade was when I designed the digital radio paging system for the LFB in 1970's. and had a lot of chats about fires and what causes them with the forensic fire investigators.

An old electrician friend would always use rings for lights in thatched cottages because of the reduced risk of overheating joints and still recommended regular checks on the ceiling rose connections.

When I look at the calculations for some systems I have to smile about the requirements for the impedance of the CPC where an RCD has be fitted. Based on them the RCD could not protect the human body from being shocked.

Had an argument with a "qualified Part P electrician" last summer. He insisted that an RCD had to have a low impedence CPC through out the system otherwise the RCD could not operate. When I asked what was the point of an RCD for a two wire lead to a hedge trimmer where there was no CPC he had no explanation. I believe he knew the rules but had no idea of how things worked. He could not see the explaination that an impendance of 6000 ohms between live to any earth will trip an RCD at 35 mA and that the 1 ohm CPC is for tripping the overcurrent MCB on a live to CPC short.

Regards

Bernard

woodywheels - 4:16 PM on Jul. 15, 2010

reply | message

Dear Eric,
I am sorry as I may be too late to help you, ref Oven for a wheelchair user, www.howdens.co.uk do an "inclusion" range, all "Care and Repair" approved contractors, use Howdens appliances when using Disability facility Grants for adaptations, their oven is called a Lamona side opening door, single oven, one would normally set the oven at waist/chest height (whatever wheelchair users preference) and would have a pull out shelf under the oven, and to the left/right (whatever way door is chose to be hung) and the user then slides the hot food to the other pull out worktop shelf, and then close the oven door. the shelves of the oven are pull out, but are firmly attached to the insides of the oven, so the user does not have to lean in, it pulls out over their lap, so they can baste food easily. the whole ovens are "built in" and can therefore be sited at a precise height for the user,
If you google, nothing ever comes up for the disabled, in relation to appliances for the disabled, and when it does, they never show prices, howdens are the same I am afraid, one needs a contractor with an account for Howdens to get the prices, I AM having one of these ovens next week, but I do not know the cost, they WONT tell me.
WW

Googleberry - 7:56 PM on Nov. 20, 2009	reply \| message
It's 'amateur' radio, not 'amature' radio! Shame I didn't get the chance to reply to your comments about isolation transformers in http://www.diynot.com/forums/viewtopic.php?t=200907 before it was locked. You seem to understand something about them, but not a lot! I mean, fancy saying "...but you have removed completely the safety earth"! Good grief man!

byelaw30 - 11:05 PM on Feb. 23, 2009	reply \| message
Thanks for that reply. Notice you're in Flintshire. I've got a bungalow in Prestatyn, might need a shower wiring up, after I've done the plumbing part.