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by Mill Spark
Wed Apr 25, 2007 7:39 pm
Forum: Electrics Forum
Topic: earth bonding wire size
Replies: 2
Views: 4786

Bonding in bathrooms is internal to the bathroom only – so there is no need to run any earth cables to the CU. Bond together all pipework, and take this to the cpc of each circuit that enters the bathroom. So for example if you had a shower, heater, lights and fan. You would run a 4mm cable from e...
by Mill Spark
Wed Apr 25, 2007 4:23 pm
Forum: Electrics Forum
Topic: Overheating 13amp plug on a small home sauna
Replies: 2
Views: 6958

What rating is the sauna and is it a moulded plug on the lead to the sauna? The heat can be caused by the load of the appliance or loose connections. As you have already said the sauna is plugged into an extension lead, and that plug is staying cool, that may rule out load. It's possible that the so...
by Mill Spark
Tue Apr 24, 2007 4:09 pm
Forum: Electrics Forum
Topic: SON Lighting
Replies: 1
Views: 2987

If you're just after the lights coming on during the hours of darkness, then the simplest method is to buy a Zodian type photocell. These are the types that control normal street lighting. You can also get SON fittings with a photo cell incorporated into each fitting, which may be the way to go, so ...
by Mill Spark
Mon Apr 16, 2007 11:11 pm
Forum: Electrics Forum
Topic: Part P notice required?
Replies: 15
Views: 9401

Hi Geoff Providing any of the two new rooms are NOT going to be a kitchen or bathroom, then yes you can install extra lighting and switches. Glad to see you've read up first regarding Part P. How confident are you on extending the light circuit as some people can find the wiring connections to ceili...
by Mill Spark
Mon Apr 16, 2007 3:04 pm
Forum: Electrics Forum
Topic: Bathroom light pull switch + extractor fan
Replies: 4
Views: 11851

Hi Simon It looks like you have the wrong replacement switch, if you have 4 cores at your switch then the switch you need is a double pole switch. This type of switch has 4 terminals and is essentially two switches operated by the one pull cord. So that one side will operate the light and the other ...
by Mill Spark
Sun Apr 15, 2007 9:37 pm
Forum: Electrics Forum
Topic: Security light stays on all day & night
Replies: 1
Views: 7167

Hi Could be a couple of faults. 1/ switching relay stuck in closed position 2/ photo cell to keep the light off during daylight has failed If it's the relay, full light replacement would be the only option, but you could try to dismantle the PIR to see if the relay can be replaced. Is there an adjus...
by Mill Spark
Sun Apr 15, 2007 9:13 pm
Forum: Electrics Forum
Topic: Installation design
Replies: 2
Views: 3495

When designing an installation three current values need to be taken into consideration thes are Ib, In & Iz. Ib = design current and may include diversity In = nominal current of the fuse or circuit breaker Iz = tabulated current of the cable for method of installation (after any extra factors ...
by Mill Spark
Sat Apr 14, 2007 8:08 pm
Forum: Electrics Forum
Topic: Bathroom electrics/Building control
Replies: 2
Views: 3922

According to the official Part P document which can be viewed on the website. Please see the project on part P. Sections 1.24 to 1.27 cover work done by those who are not qualified to complete BS7671 certificates, ie DIYers, and states it is the local BCO (Building Control Office) that is responsibl...
by Mill Spark
Sat Apr 14, 2007 12:57 am
Forum: Electrics Forum
Topic: Installing an Electric Hob
Replies: 1
Views: 3863

Using diversity your hob @ 6.2Kw works out at 15A. So 2.5mm cable is adequate, and a dedicated 20A radial circuit would be the way to go. Although if you already have a cooker circuit not in use by another oven or cooker, you could use this circuit to feed your hob. The existing fuse or circuit brea...
by Mill Spark
Fri Apr 13, 2007 8:32 pm
Forum: Electrics Forum
Topic: Consumer units
Replies: 2
Views: 4225

You should also buy a copy of the On Site Guide, as this book describes the wiring regs in easier to understand terms. Once you have a copy, Appendix 1 on page 84 explains diversity and Table 1B gives allowances. From what I remember Lighting is 66% assuming 100w per lampholder 1st Ring circuit is 1...
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