{"id":95325,"date":"2025-10-27T09:55:13","date_gmt":"2025-10-27T00:25:13","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=95325"},"modified":"2026-02-27T13:29:13","modified_gmt":"2026-02-27T03:59:13","slug":"sloppy-conduits-in-roof","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/sloppy-conduits-in-roof\/","title":{"rendered":"Poorly Protected Wires Risk A Disaster In Your Roof"},"content":{"rendered":"

\"\"<\/p>\n

Electrical conduits are the tubes used to protect and route wiring. Get them wrong and you’ll make roof spaces even more unsafe than they already are.<\/p>\n

So what does good conduit work look like? Read on while we peek above the manhole.
\n<\/p>\n

Why Is Electrical Conduit Work Important?<\/h2>\n

Conduit work can look pretty ordinary, but it’s a matter of function over form.<\/p>\n

What we’re installing is mechanical protection around the wires, but getting different arrays on different roofs connected while simultaneously running everything inside plastic pipe can be a proper nightmare.<\/p>\n

It’s plumbing with material that refuses to flow.<\/p>\n

Out Of Sight And Out Of Mind<\/h2>\n

We need to acknowledge the reality of roof spaces. Unless it’s a nice clean new build, on a cool day, without ceiling sheets installed, you’d have to be out of your mind to think it’s a good work environment.<\/p>\n

Confined spaces, heat, splinters, fine dust, rat droppings, itchy insulation, snakes and possums are just the start. When you’re inside the roof your mind has to be alive to risk. In fact it’s illegal to enter a Western Australian roof without first turning the power off.<\/p>\n

To get the claret flowing, nails and nail plates can slice you open while furring channel (the modern excuse for ceiling joists) are littered with needle point gyprock screws.<\/p>\n

You have to move without damaging fragile finishes, or fragile air conditioning, not forgetting the chance of falling through the ceiling when your foot misses a joist.<\/p>\n

\"hole

Swing over the collar tie, avoid the duct, commit weight to the beam, slip off the ceiling joist and BANG<\/p><\/div>\n

Rules For A Reason<\/h2>\n

Back when I was limber we ran black solar cable clipped straight to the timbers. Using standard white TPS wiring was prohibited unless you put it in conduit, which was rightly viewed as a massive pain in the backside.<\/p>\n

\"DC

This was compliant in 2013, with a potential here of 900Volts<\/p><\/div>\n

\"DC

Enclosed in conduit from 2014 onwards, similarly complex array wiring is more challenging to install<\/p><\/div>\n

Changes to solar installation standards<\/a> mandated conduit for everything because authorities were afraid DC solar wiring could be damaged, either by roof possums<\/del> electrcians, or the rodents<\/del> TV technicians could kill themselves cutting the wrong cable.<\/p>\n

\"solar

The black twin is a satellite TV cable that looks frighteningly similar to DC solar cable, so we put the very spicy voltage inside a uPVC “solar” conduit.<\/p><\/div>\n

Steel Frames Are The Worst<\/h2>\n

Not only are they a thermal disaster in insulation terms, lightweight steel ceiling joists can’t support your bodyweight. So you have to lumber from truss to truss, it’s difficult as the edges are sharp and they’re 1.2 metres apart.<\/p>\n

\"steel

You need to be a contortionist with a bullocks hide to navigate the small spaces and sharp edges of a cheap tin truss roof.<\/p><\/div>\n

One of the worst places I ever installed on was a newly constructed house on a now typically narrow block. The skinny roof was low and the trusses too tight to pass a body through. They barely fitted the ducted air con unit<\/a> or the ducts themselves.<\/p>\n

\"solar

Working through the manhole, these conduits are sitting on the ceiling, however they’re deemed compliant because there are external isolators on the roof.<\/p><\/div>\n

We resorted to keyhole surgery. I stood on a ladder in the manhole and pretended I was a periscope, two tradies threaded a length of conduit in from the outside. I yelled instructions to twist the rigid plastic pipe, so with a slight bend on the end, it would “steer” through the obstacles.<\/p>\n

\"solar

You have to disassemble these houses to work on them. With 6 roof sheets removed, one pushing, another manipulating a third calling instructions we got conduit through it.<\/p><\/div>\n

The Key Is Adequate Support<\/h2>\n

Electrical installation rules<\/a> stipulate wiring must be installed free of external stress or physical strain and given adequate support. While manufacturers specify things like bending radius on cables, the standard doesn’t have hard rules or fixed measurements, determining adequacy is down to your licensed electrician and their judgement.<\/p>\n

\"solar

Well labelled, well supported (green arrows) and well away from the ceiling until it meets the eaves. This ticks the boxes.<\/p><\/div>\n

 <\/p>\n

\"solar

The conduit arrowed in pink should not<\/strong> lay on the ceiling, especially when there’s more than 600mm of headroom available, defining this space as accessible under AS3000<\/p><\/div>\n

 <\/p>\n

\"conduit

Duct tape shows the compliance and care factor here is zero.<\/p><\/div>\n

Basically the people doing the work install what’s needed and certify the wiring won’t be damaged in service. In a nutshell it shouldn’t flap around, get in the way or get broken by foot traffic.<\/p>\n

\"solar

Foreground shows a timber installed to protect conduit from clumsy feet<\/p><\/div>\n

The regulations do set out rules for routing conduits though. They must not be laid across the ceiling but rather should follow the rafters. The reasoning is that fire fighters often need to spray water into the roof. When they ram a hook through the gyprock and tear down the ceiling, there must not be DC solar wiring in harms way.<\/p>\n

\"solar

The blue trace shows the approved path for DC solar conduits where no rooftop isolator is used.<\/p><\/div>\n

 <\/p>\n

\"conduit

This conduit is labelled, supported and secured, but it’s too close to the ceiling<\/p><\/div>\n

 <\/p>\n

\"conduit

This conduit is too close to the underside of the roof, plus it’s been split open, taped up and glued into the wrong sized fitting. They tried but failed here.<\/p><\/div>\n

 <\/p>\n

\"conduit

Underneath this house, there’s no DC labelling but the conduit is also too close to the floor (shaded pink) Again this is a basic AS3000 wiring rule violation.<\/p><\/div>\n

Electricity And Water Don’t Mix<\/h2>\n

Despite this incredibly common expression, electricians are inexplicably keen to bore holes and pipe condensation straight into inverters and switchgear. The rules even acknowledge this, specifying “drain valves” must be put into the conduit system at the lowest point.<\/p>\n

I can’t think of a reason why anyone needs to put plumbing into<\/em> electrical equipment, it’s ludicrous.<\/p><\/blockquote>\n

Unless we seal wiring systems, and pressurise them with inert gas, there will always be air present and air carries water.<\/p>\n

The answer is to use conduit as intended, as mechanical protection, while sealing the inverter or isolator as the manufacturers\u00a0 designed, tested and rated them. Tune in for the next exciting episode when we explore condensation.<\/p>\n

If you have any technical queries about the tiny details of your solar power system, consult our FAQ section.<\/a> It’s full of real world questions and the answers we’ve found for them. There’s lots of links to blogs like this one too, so dive in and find yourself and answer in your own time.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Electrical conduits are the tubes used to protect and route wiring. Get them wrong and you’ll make roof spaces even more unsafe than they already are. So what does good conduit work look like? Read on while we peek above the manhole.<\/p>\n","protected":false},"author":28,"featured_media":95342,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[57],"tags":[],"class_list":["post-95325","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-installation","entry"],"acf":[],"yoast_head":"\nPoorly Protected Wires Risk A Disaster In Your Roof<\/title>\n<meta name=\"description\" content=\"Compliant wiring installation in roof spaces can be a nightmare. 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He\u2019s a licensed electrician, builder, roofer and solar installer who for 14 years did jobs all over SA - residential, commercial, on-grid and off-grid. A true enthusiast with a skillset the typical solar installer might not have, his blogs are typically deep dives that draw on his decades of experience in the industry to educate and entertain. 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But there's a good reason you\u2026","rel":"","context":"In "Solar Installation"","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/11\/death-on-a-stick-header.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/11\/death-on-a-stick-header.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/11\/death-on-a-stick-header.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/11\/death-on-a-stick-header.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/11\/death-on-a-stick-header.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":63166,"url":"https:\/\/www.solarquotes.com.au\/blog\/cable-conduit-solar-inverters\/","url_meta":{"origin":95325,"position":2},"title":"Conduit & Solar Inverters: The Good, Bad & Fugly","author":"Anthony Bennett","date":"July 11, 2022","format":false,"excerpt":"The $200, 2-inch thick, spiral-bound 'AS\/NZS 3000 Electrical Installations' is also known as The Wiring Rules, The Book, or The Bible. Electricians use it to beat each other over the head when they feel a fellow sparkie has strayed from the true path of holy electrical compliance. 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I recently heard a\u2026","rel":"","context":"In "Solar Panels"","block_context":{"text":"Solar Panels","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-panels-2\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/01\/dc-conduit-over-rail-under-panel.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/01\/dc-conduit-over-rail-under-panel.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/01\/dc-conduit-over-rail-under-panel.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/01\/dc-conduit-over-rail-under-panel.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":91628,"url":"https:\/\/www.solarquotes.com.au\/blog\/power-data-same-conduit\/","url_meta":{"origin":95325,"position":5},"title":"Wiring Wrangles: How Power And Data Make Electricians Bicker","author":"Anthony Bennett","date":"April 25, 2025","format":false,"excerpt":"SolarQuotes recently detailed the fairly difficult installation of a home EV charger and sure enough, the electricians turned up in the comments section to start arguing about it. 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