Spend half an hour at the SED trade counter and you’ll hear the same kind of questions again and again.
Some are quick: “Got any more of these?” Others need a bit more digging: “Will this work with that?”
or “What size cable do I need for this job?”
We thought we’d pull together ten of the most common questions we get asked – and how we usually help.
It’s not a replacement for proper design or the Wiring Regs (that part is always down to the electrician),
but it does show how we try to back you up day to day.
1. “What size cable do I need for this?”
This one comes up a lot – and the honest answer is: it depends.
We’ll always remind people that final design and compliance with the regs is the installer’s responsibility.
But we can help you think it through by asking things like:
- What’s the load and how far are you running it?
- How is the cable being installed – clipped direct, in insulation, underground?
- Is this a new circuit or an alteration?
Once we’ve got a rough picture, we can point you towards suitable cable types and sizes to match what you’ve
already calculated, and make sure you’ve got the right glands, fixings and accessories to go with it.
2. “Is this the right LED to replace my old fitting?”
Another regular: someone walks in with a lamp or a photo of an old fitting and asks what LED they should use instead.
We’ll usually look at:
- Cap type (GU10, E27, etc.)
- Wattage and lumen output on the old lamp
- Colour temperature – do they want warm, cool or daylight?
- Dimming – is it on a dimmer or just on/off?
From there, we can suggest LED options that keep the look and feel the client wants, while using less energy and lasting longer.
If it’s a fluorescent-to-LED panel or batten swap, we’ll talk about light levels and spacing as well.
3. “What IP rating do I need here?”
IP ratings can be confusing, especially for bathrooms and outdoor areas.
We often get questions like:
- “Is IP44 enough for this?”
- “Do I need IP65 over a shower?”
- “What would you use outside on a coastal property?”
We’ll talk through where the fitting is going, how exposed it is to water, dust and the elements,
and then suggest suitable IP ratings and products. You still make the final call, but we can help narrow the choices
so you’re not guessing off the shelf.
4. “Will this MCB/RCBO fit that board?”
Boards and breakers are another common one.
Very often, someone will hold up a device and say: “Will this fit my board?” or
“Have you got the equivalent in [brand]?”
We’ll check:
- The make and model of the existing board
- The type and rating of the device you need
- Whether there’s a manufacturer-approved equivalent
Where possible, we’ll match like-for-like from the same manufacturer. If that’s not an option,
we’ll talk you through what’s available so you can make an informed decision and keep things compliant.
5. “Do I need fire-rated downlights here?”
This comes up a lot on domestic and small commercial jobs.
We’ll usually ask:
- What type of ceiling is it?
- Is there a room above?
- Is it a conversion, extension or new build?
We can then point you towards suitable fire-rated downlights, bezels and lamps where they’re needed,
and explain the difference between integrated and non-integrated options so you can choose what suits the job
and your client best.
6. “Will these lights work on a dimmer?”
Dimming can be a minefield if you’re mixing older dimmers with newer LED fittings.
Typical questions include:
- “Can I put these on the existing dimmer?”
- “Do I need a special LED dimmer?”
- “Why is it flickering?”
We’ll check compatibility info from the manufacturer, talk about leading-edge vs trailing-edge dimmers,
and suggest dimmers and lamps we know play nicely together. That way you’re less likely to get the
“it’s buzzing / flickering” phone call later.
7. “Can I use this outside / in a garage / in a loft?”
Plenty of jobs involve spaces that are cold, damp, dusty or just awkward.
We’ll ask where the fitting or equipment is going, what it’s exposed to, and how it’s going to be used.
Then we’ll suggest:
- Appropriate IP and IK ratings
- Suitable housings, enclosures or bulkheads
- Cable types and accessories that can cope with the environment
It’s all about matching the gear to the conditions so you’re not back in six months swapping out failed fittings.
8. “Can I mix brands on accessories and plates?”
Grid systems, decorative fronts and accessories are another common area of confusion.
We get questions like:
- “Will this front fit that grid?”
- “Can I use another brand’s module in this plate?”
In most cases, grid and plates are designed to work within the same brand family. We’ll check the catalogues,
look at what you’ve brought in, and help you find combinations that are designed to go together so you don’t
end up with something that doesn’t quite fit – or looks wrong on the wall.
9. “Have you got something a bit cheaper that will still do the job?”
Budgets are tight. It’s very common to hear: “Have you got a cheaper option?” or
“Client’s getting nervous about the price.”
We’ll always be honest about what you’re trading off:
- Warranty length
- Build quality and finish
- Extra features (dimming, emergency, smart control, etc.)
Where there’s a sensible alternative that still does the job properly, we’ll suggest it.
If we think dropping to a cheaper product is a false economy, we’ll say so – it’s your reputation on the line,
and we’d rather help you avoid call-backs.
10. “Can you help me put a full list together for this job?”
One of the best questions we get.
Bring us a spec, set of drawings, or even just a rough outline, and we can help you:
- Turn it into a full materials list
- Spot obvious gaps (fixings, glands, clips, accessories)
- Suggest options where the spec allows some flexibility
You’re still in control of the quote and design, but having a second pair of eyes at the wholesaler can save a lot of time
and reduce the number of “forgot that bit” trips back to the counter.
Got a question we haven’t covered?
If you’ve got a question about fittings, compatibility, ratings, replacements or pulling together a job, just ask.
The SED trade counter team deal with these queries all day, every day – and while we can’t design the job for you,
we’re always happy to share what we know, check the catalogues and help you find the right kit for the work you’re doing.
