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Questions and electrical advice in the Commercial Electrical Advice - Discussions on Three Phase Supplies, three phase machinery and motors, DOL starters, phase sequence, running steel conduit, trunking and other questions on industrial and commercial electrical installations and maintenance. Commercial Electrical Talk. Also notice our Electrical Advice Forum and our Industrial Electrical Forum.

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What size cable do I need?
Machine uses total power of 75kva. 22kw. 3 phase. What size cable will I need for this machine?
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280
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27K
Geordie Spark
G
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Industrial Electricians Only:
As a follow on from Mike’s ”electricians only” thread, I’m interested to find out how many of us are industrial and maintenance electricians...
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171
Views
21K
Knobhead
K
D Skelton
  • Poll
Age of those who can build a control panel and control a process
So reading through a few of the recent threads where lack of skills in the industry seems to be the main bone of contention, I'm personally...
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98
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13K
sysrq
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S
Cable calculation
Il give you the scenario, stables in a field, e-on have been out and put a supply in a hut with a meter on and a one shot, main fuse is 80amps...
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91
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9K
ackbarthestar
ackbarthestar
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24v relay circuit - elp!
Hi guys, Need some advice on how to go about building this circuit. In summary, i fear i may bore you death with the full version, i need to...
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82
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12K
silva.foxx
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leespeed
star delta motor .....extra stop/start....415v abb
whats the best and safest way to install a remote start stop system on a star delta motor .........i can only seem to find remote stops in series...
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Replies
81
Views
10K
netblindpaul
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B
Live Working
Quick fire question. I was always told that you cannot do live working unless the customer cannot shut X appliance down for what ever reason, a...
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81
Views
11K
Engineer54
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L
Feeding 250 amp 3 phase board direct from buzz bar need isolatir
I'm working in a warehouse and replacing the old fuse boards with a new 3 phase board. The board will be sitting directly above the buzz bar im...
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Replies
77
Views
9K
Deleted member 78588
D
S
When testing a circuit protected by RCBO, do you test at the DB or furtherst point
Hi, I just have a few questions in regards to testing an RCBO circuit Is there a requirement to test at either the furthest point or the DB or is...
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Replies
76
Views
15K
telectrix
telectrix
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DOL starter 7.5HP, 3 ph motor
Morning guys, Had a U-trough mixer go down, contactor failure as well as electro-pneumatic pressure switch problems. So i have decided to do away...
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Replies
76
Views
9K
ruston
ruston
S
Time to call it a day
I have been a sparks for 30 odd years ,I did my 3 years at college for my 2361 1&2 I have my 16th and my employer does not trust my work now...
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Replies
74
Views
7K
Andy-1960
Andy-1960
C
Sub Main Supply
Hello, My boss is away and I'm trying to score a few brownie points if i can. We are currently working for a plastic fabrication company who...
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Replies
73
Views
12K
Engineer54
E
C
Use of tie wraps and bunching conductors in DB's
Hello all, I am told that this is no longer permissible under the 17th edition or one of its amendments. This argument seems to have been going...
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Replies
72
Views
15K
conrad
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J
Conduit bending of double sets
Where is the back of the bend on the conduit former?
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Replies
71
Views
14K
Silly Sausage
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Corbs
Need Some Advice / Guidance
Right some back story we rent a unit, 3 years ago they upgraded/updated the old consumer unit (metal, pull out fuses to a crappy plastic crabtree...
2 3 4
Replies
71
Views
6K
Corbs
Corbs
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Losing voltage at E stop
Hi lads,ladies I have just put together an E stop circuit that is integrated into an auger motor control circuit w/ forward/reverse DOL. I have...
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Replies
68
Views
9K
wade88
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A
My Panel
Im an electrical apprentise just about out of my time been working for 2 years now mainly as a mainternance engineer, but do lots of installs and...
    • Like
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Replies
68
Views
9K
xraytek
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W
Trunking vs tray
Hi lads/ladies After a recent post of mine, the lack of tray or trunking was highlighted on a bit of my work, i've taken this criticism fully on...
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Replies
67
Views
18K
Smudge
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markthebuilder
Identifying live cables
hi gents . I’m currently surveying a property prior to remodelling it... it was a department store and it’s been redeveloped at least once but no...
    • Funny
    • Useful
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Replies
66
Views
6K
The Ghost
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G
Rear entry three phase board
Hi, Is it OK to create a rear entry in an eight way three phase BD. A technician friend of mine says he has never seen this done before?
    • Creative
    • Friendly
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Replies
66
Views
10K
Gigsy
G
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