Hi All, First time poster here. I'm an ex-plumber and lamp making diyer.
My question is this:
Is it safe to wire a lamp like the one here (image 1 below):
with a toggle switch as seen here (image 2 below):
Switch type: toggle
Contacts configuration: DPST
Switching method: ON-OFF
I have been asked to ‘bond’ some tables or industrial sized wash bins by the engineering supervisor here at work. People stand and work out of these. Simple structure with water that’s filled from a hose.
Q “can you bond these tables, and what do you think?”
Me. “Well, seeing they are not...
The power cable on my table saw attached to the motor came off when I changed blade to 45 degrees.
Turned saw upside down and the power cable was hanging loose, the only wire coming out the motor is a red live cable, how can I reattach the power cable when it has live and neutral wires...
A lot of these mock exam questions are not specific about armoured or non armoured multicore cables, flat twin or not etc, the correct table to use can be a bit of trial and error until you get the correct answer for Volt drop for example.
Hi guys some help required!! My sister runs a centre and has bought 5 x 3kw table top combined oven and hobs they are supplied with plugs which cant be removed as that will invalidate the warrentys. There are 3 spare slots on the consumer unit how can she safely run all 5 appliances. she says...
Could somebody please clarify the difference between tables 4.1.2a & b. It appears to me that the difference is in types of circuit breakers - B or C depending upon max test loop impedance. Is this correct and which measurement do they mean by test loop impedance?
We have a massive selection of LP's - not all on CD or downloads! Some of which I'd like to listen to
We also have an early 1990's Dual CS 430 turntable - but the central spindle will not rotate free - there is no obvious way to clean or lubricate it and despite doing a number of internet...
I have one in the OSG and I have the BSI IET (size of a yellow pages) regs book. I found this too:
I've chosen A for air tight conduits in the concrete wall of a...
I am planning a metal table lamp. The light will be a 12 volt LED fed from a plug in transformer, so there will not be any 240 volt cable or connection to the table lamp. Do I need to earth the metal of the table lamp?
Hi All, the story so far : Customer has asked me to make her old brass table lamp work. How hard could it be? No earth, so first step was some new 3 core flex and a brass lamp holder that's got an earth point. An inline switch and I'm away. But no, the new flex won't fit up the stem of the lamp...
Thumbing through the OSG guide today and I have a couple of questions regarding the above table.
Firstly, just a idiot check but electric showers would fall into no.5 water heaters of the instantaneous type. I know this but so often doubt myself.
Secondly, No. 9. Am I right...
I hope my abbreviated title caught someone's attention and makes some sort of sense.
On page 58 of the Electricians Guide to the Building Regulations there are some standard circuits listed. In particular I'm looking at the cooker entry on page 59 and have a couple of questions:
I know it's late and the lap dances are still open , so i will wait till tomorrow for any replies . Does anyone have resistance per meter tables for steel armour 90degree thermosetting ,can't find it anywhere . Ta
Determine the minimum size of cpc for the circuit giving consideration to; Disconnection times Thermal Constraints?
Here is what I have worked out so far for the circuit -
Ib=p/(Ulx√3) = 12000/(400 x 1.732) = 17.32Amps
From Table B6 I selected a C20 which has a max Zs of 0.87 Ω
Hello Can I just confirm that if 90 degree cable is used in switch gear that is only ratted at 70 degrees then you use the 70 degree tables to find the maximum current carrying capacity in this case Table 4D1A
I ask this as I carried out an EICR and found 4mm 6491B cable run in trunking...
Also just revising: trying to apply a rating factor for insulation on a cable calc. Just in theory, it's not for an actual job.
The cable will be clipped direct to joists above ceiling and is covered in >100mm thermal insulation. I cannot find the correction factor for insulation. Advice please!
Might be a silly question but getting really confused.
Table 4D5 for choosing cable size for different installation methods, does this already have de-rating factors applied for the different methods? If so, then if you calculated your current capacity using specific de-rating factors...
i am trying to install a 1no1nc push on off led switch in my car to intercept my power antennae. it has 5 terminals with red, white, black and 2 green wires. the 2 green wires are marked NO and NC. i think the red is marked+. cannot see any markings for black and white wires.it did not come...
I've recently done a C&G 2396 Electrical Design Course and unfortunately the tutor who taught the course did so for the first time and in my opinion didn't do a good job of teaching the material. I'm now doing my revision for an exam this Thursday and trying to make sure all the formula I use...
I have a quick question on using my on site guide. I've found this forum fantastic for help so far. It's quite simple.
I have a question which asks what the voltage drop for a single core 6mm² 70⁰c insulted cable for a single phase circuit is, enclosed in conduit.
Page 151 of the...
Eh up :)
We all know about the duff max Zs tables in the OSG (Table B6) and GN3 (Table A4)... in fact, I've only just recently updated my GN3, and I'm pleased to say they have reprinted it and it now has the correct tables in.
I've noticed in my (early-purchased, with dodgy table B6) OSG that...
The heading of table 41.3 says it shows " max earth fault loop impedance Zs for Circuits Breakers..... giving compliance with 0.4s disconnnect time of 418.104.22.168 and 5s disconnnect time of 422.214.171.124."
4126.96.36.199 is for final circuits not exceeding 32A. 4188.8.131.52 is for distribution circuits and...
So, when I did my 2391 I&t course I was told to use to values in table 41.3 of the regs for max ZS value for rcbo which provide earth fault, and over load protection. Recently a colleague of mine said you should use the value in table 41.5 which states a max permissible ZS of 1667 ohms. I don't...
Am running a radial power circuit in 4mm fp200 with a 20A rcbo but am a bit worried about the voltage drop. I have a 70M run clipped direct and by my calculations I will need to go to 6mm. I am using table 4d2 but don't know if there is a table for fp200.
Would a 10.5kW Shower require 10mm or 16mm twin and earth?
I've been doing cable calculations at college and im not 100%.
Cable Length = 20m
Protective Device = 50A
Wiring method = Above plasterboard ceiling not exceeding 100mm insulation
I belive 10mm is sufficient but my calcs...
Doing some testing today and came across something I was hoping to get cleared up.
The maz zs of a c type 16amp 61009 is 1.44 ohms on table 41.3 however on table 41.5 it states that a 30ma 61009 under 32amp can have max zs of 1667ohms.
Would you write on test sheet maz zs 1667 ohms and...
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We've been told you've got what it takes to become a Which? Trusted Trader.
We're delighted to let you know that our members have recommended xxxxxxxxxxx to join our Which...
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I have been asked by a customer to solve a problem, he has a 3 phase 20A D curve breaker supplying 3 single phase breakers 2 x 6A and 1 x 2A. The 6A breakers are supplying 2 pumps with a load of about 4A each. When 1 of the pumps are turned on, the 20A trips. Any ideas why? The earth loop...
Which table do you use in BS7671 for volt drop for LSF Twin and Earth? There does not appear to be a table for LSF cable. 4D5 refers to the grey PVC cable and is not the right one to use for the white LSF. Any help would be appreciated.
I need to put in a 3 phase supply for a piece of equipment in a commercial unit. They've sent the spec sheet for the item over and all it says is
Current type (Ph/V/Hz): 3/420/50
Power rating (kW): 7.8
I just want to clarify if it's 7.8kW per phase or 7.8kW total over all...
In the Workshop we have table saw which sometimes doesn't start just hums and you need to start the with a bit of wood, I have only just started with them and they asked if it could be fixed for me its a capacitor problem but i don't want to say order a new capacitor and it will it work in-case...
Hey guys i was looking at, the onsite guide and the tables with in it and I am finding them a little confusing to read/interperet. Can someone clarify this for me? Specifically table 7.1(i) the installation methods i can't seem to find them in the bs 7671 regs book, or they dont match up in both...
I need a have a LED light with below specification :
3 x 3W
Can you please help me to find a battery for these LED with constant use 8 hour?
I need a rechargeable lithium ion battery? how can i charge this...